2.7L Quattro V6 Turbocharged GAS (260 Hp); C5 2000-2004
2.7L Quattro V6 Turbocharged GAS (260 Hp); C5 2000-2004
Audi A6 Quattro 2.7T V6 (2004) Platform Guide
In this Vehicle Platform Guide, you will find the top common issues of Audi A6 (C5; 2004) 2.7L Turbocharged V6 Quattro, along with their fault codes, and the solutions from eEuroparts.com
The 2004 Audi A6 2.7T Quattro (C5) blends twin-turbocharged urgency with executive refinement, delivering a potent V6 experience wrapped in understated German luxury. Anchored in the C5 generation, this A6 variant features a longitudinally mounted 2.7-liter bi-turbo V6 engine paired with either a 6-speed manual or 5-speed Tiptronic automatic transmission, driving all four wheels via Audi’s Quattro permanent AWD system. With 30 valves and dual turbochargers, the 2.7T offers a broad torque band and brisk acceleration, echoing the DNA of the B5 S4 in a more spacious, mature package.
Specifications
Engine and Powertrain
Engine:
2.7L V6 Biturbo
Engine Code:
APB
Transmission:
6-Speed Manual / 5-Speed Tiptronic Automatic
Fuel Type:
Gasoline
Horsepower:
~260 hp at 5,800 rpm
Torque:
~295 lb-ft at 1,850–3,600 rpm
Fuel Economy (EPA Estimates)
City/Highway Combined:
16–24 MPG
Vehicle Weight
Curb Weight:
~ 3,759 lbs
Gross Weight:
~ 4,971 lbs
Configurations and Submodels
Body Styles:
sedan
Seating Capacity:
5 passengers
Drivetrain Options:
Quattro Permanent All-Wheel Drive
Top Common Issues with Audi A6 (C5; 2004) 2.7L Turbocharged V6 Quattro
The brake booster relies on engine vacuum to multiply braking force with minimal pedal effort. Over time, the internal diaphragm can crack, seals may leak, or the check valve can fail. These issues reduce vacuum pressure, forcing the driver to apply more force on the brake pedal to achieve the same stopping power.
Symptoms:
Hard brake pedal – The pedal feels stiff, requiring greater leg pressure than normal.
Hissing sound – A noticeable vacuum leak noise when pressing the brake pedal.
Longer stopping distances – The car may take more time to come to a complete stop.
Brake warning light – The dash may display warnings related to braking performance.
Engine performance changes – Vacuum leaks from the booster can cause rough idle or stalling.
Driver fatigue – Constant extra effort on the brake pedal can be tiring in stop-and-go driving.
Parts to Replace
TRW Power Brake Booster PSA743- delivers reliable braking assistance by amplifying pedal force with vacuum pressure, ensuring safer stopping power, consistent performance, and enhanced driver comfort for modern automotive braking systems.
The brake master cylinder is the heart of the hydraulic braking system. Over time, internal seals can wear down or fluid contamination can corrode the cylinder bore. This leads to pressure loss inside the system, causing inconsistent braking response and, in some cases, dangerous stopping distances.
Symptoms:
Soft or spongy brake pedal – Pedal feels mushy and sinks further than normal.
Brake fluid leaks – Visible leaks around the brake master cylinder area.
Inconsistent braking power – Uneven or unpredictable braking force while driving.
Brake warning light illumination – System detects pressure imbalance or hydraulic failure.
Increased stopping distance – Brakes require more time and effort to bring the car to a stop.
Front upper control arm bushing failure occurs from wear, heat, misalignment, corrosion, poor materials, road impact, or environmental exposure.
Symptoms:
Steering wheel vibration increases, especially during acceleration or when driving over uneven surfaces.
Clunking or banging noises emerge from the suspension when turning or hitting bumps.
Vehicle stability decreases, making the car feel loose or unpredictable at higher speeds.
Uneven tire wear appears due to misalignment caused by excessive play in the control arm.
Steering wander develops, where the car pulls to one side or feels difficult to keep straight.
Parts to Replace
Front Lower Rearward 4D0407183AC The Audi Control Arm Bushing - Front Lower Rearward is a crucial component designed to enhance the performance and reliability of your vehicle's suspension system.
Front Lower Inner 4D0407182G The Genuine VW/Audi Control Arm Bushing plays a crucial role in your vehicle's suspension system, insulating the control arm from the car's frame while cushioning its movement.
Front Upper 4B0407515 The Genuine VW/Audi Audi Control Arm Bushing is engineered to meet or exceed OEM standards, ensuring high-quality performance and durability.
Front Lower Rearward- 1765901 The Lemforder Control Arm Bushing is an essential component designed to insulate the control arm from your vehicle's frame, providing crucial cushioning as the control arm moves.
Jounce bumper failure occurs from fatigue, repeated compression, aging rubber, bottoming out, poor material quality, heat, and suspension misalignment.
Symptoms:
Clunking noises occur when driving over bumps due to metal-to-metal contact in the suspension.
Excessive bouncing follows road impacts, as the bumper no longer cushions suspension compression.
Reduced ride comfort is noticeable, especially on uneven terrain or potholes.
Suspension bottoming out happens more frequently, stressing shocks and control arms.
Uneven tire wear develops from compromised suspension geometry and damping.
Parts to Replace
OEM Audi VW Shock Bump Stop - Rear 4B0512131Q The Genuine VW/Audi Shock Bump Stop (part number 4B0512131Q) is engineered to meet OEM standards, ensuring a perfect fit and optimal performance for your Audi.
Front Part # AVZ0166 The Rein Jounce Bumper part number AVZ0166 is the perfect addition to your Audi or Volkswagen.
Front- AVZ0271P The Rein Audi Strut Bump Stop is a crucial component designed to enhance the performance and longevity of your vehicle's suspension system.
Rein Audi Jounce Bumper Set - Front- AVX0271P The Rein Jounce Bumper Set (part number AVX0271P) is specifically engineered to provide optimal performance for Audi vehicles requiring part number 8D0 412 131H.
C1034 and C1046 indicate yaw rate sensor and steering angle sensor faults, affecting ABS, traction, and stability control systems.
Why it happens:
Air suspension spring failure occurs from air leaks, rubber degradation, impact damage, compressor issues, aging, heat, debris, and poor maintenance.
Symptoms:
The vehicle sags or leans noticeably to one side, especially after parking overnight.
Ride height fluctuates unpredictably while driving or idling, indicating air leaks or compressor strain.
Dashboard warning lights such as “Suspension Fault” or “Car Too Low” appear.
Bumpy or harsh ride quality replaces the usual smoothness, especially over uneven terrain.
The compressor runs excessively or cycles frequently, trying to compensate for lost air pressure.
Parts to Replace
Front Part # A-2239 The Arnott Industries Air Suspension Spring part number A-2239 is a premium-quality replacement designed specifically for Audi vehicles.
Front (Generation II) Part # A-2730 The Arnott Industries Air Suspension Spring part number A-2730 is a premium aftermarket replacement designed specifically for Audi vehicles.
P0300–P0306 codes indicate random and specific cylinder misfires, caused by ignition faults, fuel issues, vacuum leaks, or compression loss.
Why it happens:
Ignition coil failure occurs due to overheating, voltage spikes, oil contamination, worn spark plugs, poor wiring, vibration, or internal insulation breakdown.
Symptoms:
Engine Misfire: The engine may misfire, causing jerky acceleration or hesitation during throttle input.
Rough Idle: At idle, the engine may run unevenly or vibrate excessively due to inconsistent spark delivery.
Poor Fuel Economy: Incomplete combustion from weak spark leads to increased fuel consumption and reduced mileage.
Hard Starting: The engine may crank longer or struggle to start, especially in cold conditions or under load.
Illuminated Check Engine Light: A faulty coil often triggers the check engine light, commonly with misfire codes like P0300–P0306.
Parts to Replace
Bosch Audi Ignition Coil- 0986221024 The Bosch direct ignition coil, part number 0986221024, is a high-quality replacement component designed for optimal performance in Audi and Volkswagen vehicles.
Hitachi Audi VW Ignition Coil IGC0149 The Hitachi Direct Ignition Coil (Part Number IGC0149) is engineered to meet or exceed OEM standards, ensuring reliable performance for your Audi or Volkswagen ignition system.
NGK Audi Volkswagen Ignition Coil 48843 The NGK Ignition Coil 48843 is engineered to meet OEM standards, providing reliable performance for your Audi or Volkswagen vehicle.
Audi VW Ignition Coil R0501S00400 The Eldor Direct Ignition Coil R0501S00400 is engineered to provide superior performance for your Audi and Volkswagen vehicles.
P0335 indicates a crankshaft position sensor “A” circuit malfunction, disrupting ignition timing, fuel delivery, and engine performance.
Why it happens:
Crankshaft position sensor failure occurs due to heat damage, vibration, wiring faults, oil contamination, or internal electronic degradation over time.
Symptoms:
Engine stalls unexpectedly: The ECU loses crankshaft data, causing sudden shutdowns during idle or driving.
Hard starting or no-start: Without accurate crankshaft signals, the engine may crank but fail to ignite.
Check engine light activates: Fault codes like P0335 appear when the sensor circuit malfunctions.
Engine misfires or hesitates: Erratic timing from bad sensor input disrupts combustion and throttle response.
Reduced fuel efficiency: Poor ignition timing leads to incomplete combustion and increased fuel consumption.
Parts to Replace
Manual 06A906433C The Genuine VW/Audi Crankshaft Position Sensor is a critical component for maintaining optimal engine performance in your Audi vehicle.
Automatic 078906433F The Genuine VW/Audi Engine Crankshaft Position Sensor part number 078906433F is an essential component for Audi owners seeking to maintain optimal engine performance.
Bosch Audi Crankshaft Positon Sensor - 0261210217 The Bosch Engine Crankshaft Position Sensor part number 0261210217 is an essential component for Audi owners seeking to enhance their vehicle's performance and reliability.
Power steering reservoir failure occurs from cracks, leaks, clogged filters, contaminated fluid, aging seals, poor maintenance, or excessive heat exposure.
Symptoms:
A persistent whining or groaning noise occurs when turning the steering wheel, especially at low speeds.
Fluid leaks may appear beneath the vehicle, even if the reservoir itself shows no visible cracks.
Bubbles or foam in the reservoir indicate air contamination, reducing hydraulic efficiency.
Steering becomes stiff or jerky, particularly during parking maneuvers or tight turns.
The steering response feels delayed or spongy, suggesting clogged filters or restricted fluid flow.
Parts to Replace
OEM Audi Power Steering Reservoir 8D0422371K The Genuine VW/Audi Power Steering Reservoir part number 8D0422371K / 8D0 422 371 K is an essential component of your Audi's power steering system.
Rein Audi VW Power Steering Reservoir PSR0221 The Rein Power Steering Reservoir part number PSR0221 is a high-quality replacement designed specifically for Audi and Volkswagen vehicles.
OEM Audi Power Steering Suction Hose 8D0422887AC The Genuine VW/Audi Power Steering Reservoir Hose (part number 8D0422887AC / 8D0 422 887 AC) is engineered to deliver exceptional performance for your Audi's power steering system.
Rear 4D0407625E The Genuine VW/Audi Wheel Bearing part number 4D0407625E is an essential component for Audi vehicles that require smooth and safe drivability.
Bison Performance Wheel Bearing - Front Part # BPWH02004 The BISON PERFORMANCE Wheel Bearing for the front axle is engineered to meet or exceed OEM standards, ensuring a reliable replacement for your vehicle's worn or damaged components.
P0299 and P0234 signal turbo boost faults; P2563 and P0035 indicate actuator and bypass valve control circuit issues respectively.
Why it happens:
Turbocharger failure occurs due to oil starvation, contamination, foreign object damage, overspeeding, poor maintenance, and improper shutdown or cold acceleration.
Symptoms:
Loss of power: The engine feels sluggish and struggles to accelerate, especially under load or uphill conditions.
Excessive exhaust smoke: Blue or grey smoke from the tailpipe often indicates oil leaking into the exhaust system.
Unusual noises: A whining, rattling, or screeching sound during acceleration may signal internal turbo damage.
Oil consumption increase: Frequent top-ups or visible oil leaks around the turbo suggest seal or bearing failure.
Check engine light: Fault codes like P0299 or P0234 may trigger the warning light due to boost pressure irregularities.
Parts to Replace
Driver Side (Rebuilt) 078145701SX The Genuine VW/Audi Turbocharger, part number 078145701SX, is an exceptional replacement component engineered specifically for Audi vehicles.
Passenger Side (Rebuilt) 078145702SX The Genuine VW/Audi Turbocharger part number 078145702SX is the ideal replacement for your Audi's damaged or old turbocharger.
Driver Side (Rebuilt) (Auto Trans) 078145701TX The Genuine VW/Audi Turbocharger part number 078145701TX is crafted for high-performance Audi vehicles, ensuring enhanced engine power and efficiency.
Passenger Side (New) 53049880026 Designed specifically for the passenger side, this upgraded turbocharger enhances vehicle responsiveness and efficiency, making it an ideal replacement for your aging or malfunctioning unit.
P0130–P0161 codes indicate oxygen sensor circuit and heater faults, affecting air-fuel ratio, emissions, and engine performance accuracy.
Why it happens:
Oxygen sensor failure occurs from age, contamination (oil, coolant, fuel additives), overheating, poor fuel quality, and exhaust leaks or damage.
Symptoms:
Check engine light: A faulty oxygen sensor often triggers the warning light, accompanied by codes like P0130–P0161.
Poor fuel economy: Incorrect readings cause the ECU to enrich or lean out the mixture, leading to increased fuel consumption.
Rough idle or stalling: Inconsistent air-fuel ratios disrupt combustion, causing unstable idle or engine shutdown.
Failed emissions test: A malfunctioning sensor can lead to high NOx or CO levels, exceeding regulatory limits.
Sulfur or fuel odor: Unburnt fuel or catalytic converter stress may produce a rotten egg smell from the exhaust.
Parts to Replace
Front 1K0998262Q The Genuine VW/Audi Oxygen Sensor is engineered to meet OEM standards, ensuring premium-grade construction and reliable performance for your Audi vehicle.
Rear 1K0998262 This premium-grade oxygen sensor plays a critical role in monitoring the exhaust concentration of oxygen, helping to maintain the ideal air-to-fuel mixture for your vehicle.
NTK Audi Porsche VW Oxygen Sensor 25605 The NTK Oxygen Sensor part number 25605 is a premium-grade replacement designed specifically for Audi, Porsche, and Volkswagen vehicles.
Denso Upstream- 2344859 Engineered to meet or exceed OEM standards, this oxygen sensor plays a crucial role in monitoring the exhaust concentration of oxygen, allowing the engine to maintain an optimal air-fuel mixture.
Codes P0300–P0308, P0171, and P0507 indicate misfires, lean fuel mix, and high idle, often caused by air leaks.
Why it happens:
Intake and exhaust valve failure occurs from overheating, poor sealing, carbon buildup, wear, fatigue, or piston contact during misfire events.
Symptoms:
Loss of engine power: Poor valve sealing reduces compression, causing sluggish acceleration and reduced overall performance.
Rough idle or misfiring: Incomplete combustion from faulty valves leads to unstable idle and cylinder misfires.
Blue or white exhaust smoke: Oil or unburnt fuel leaking past damaged valves burns in the chamber, producing visible tailpipe smoke.
Hard starting or no-start condition: Improper valve timing disrupts air-fuel flow, making ignition difficult or impossible.
Ticking or popping noises: Worn valve components create audible tapping or popping sounds, especially during acceleration.
Parts to Replace
OEM Audi Intake Valve 058109601C The Genuine VW/Audi Engine Intake Valve, part number 058109601C, is engineered to meet the highest standards for Audi engines.
OEM Audi Exhaust Valve 058109611E This premium exhaust valve controls the flow of burned gases from the cylinder to the exhaust manifold, ensuring efficient operation throughout the combustion cycle.
P1479 and P0106 indicate cooling fan circuit and MAP sensor faults, causing overheating, poor performance, and erratic fuel delivery.
Why it happens:
Vacuum pump failure occurs due to contamination, overheating, worn seals, poor lubrication, clogged filters, or incorrect installation and maintenance gaps.
Symptoms:
Hard brake pedal feel: Reduced vacuum pressure affects brake booster function, making the pedal stiff and braking effort higher.
Sluggish HVAC controls: Vacuum-operated vents and actuators respond slowly or fail to switch modes properly.
Unusual noises from pump: Grinding, rattling, or screeching sounds suggest internal vane wear or bearing damage.
Oil or fluid leaks: Damaged seals or gaskets allow lubricant to escape, compromising vacuum integrity and contaminating nearby components.
OEM Audi Vacuum Pump 4008231 The OEM Vacuum Pump, part number 4008231, is a premium-grade replacement component designed specifically for a range of Audi models.
P0300–P0308, P0171, and P0174 indicate cylinder misfires and lean conditions from ignition faults, vacuum leaks, or fuel issues.
Why it happens:
Piston ring failure occurs from poor lubrication, overheating, carbon buildup, cylinder wear, incorrect installation, or low-quality materials under high stress.
Symptoms:
Blue exhaust smoke: Oil leaking past worn rings burns in the combustion chamber, producing bluish smoke from the tailpipe.
Excessive oil consumption: Failed rings allow oil into cylinders, requiring frequent top-ups despite no external leaks.
Loss of compression: Poor sealing reduces cylinder pressure, causing weak acceleration and poor engine performance.
Oil fouling on spark plugs: Oil intrusion coats plugs, leading to misfires and rough running.
Blow-by gases in crankcase: Combustion gases escape past rings, pressurizing the crankcase and causing oil leaks or dipstick smoke.
Parts to Replace
OEM Audi VW Piston Ring Set (STD) 06B198151B The Genuine VW/Audi Engine Piston Ring Set, part number 06B198151B, is a top-quality replacement designed specifically for Audi engines.
Mahle Audi VW Piston Ring Set (STD)- 03316N0 The MAHLE Engine Piston Ring Set, part number 033 16 N0, is engineered to provide exceptional performance and reliability for your Audi and Volkswagen vehicles.
P0101 signals MAF sensor performance issue—airflow readings deviate from expected range, causing poor fuel delivery and drivability problems.
Why it happens:
MAF sensor failure occurs due to dirt buildup, oil contamination, damaged wiring, heat stress, or faulty electronics disrupting airflow readings.
Symptoms:
The engine hesitates or jerks during acceleration due to incorrect air-fuel mixture.
Fuel economy worsens as the ECU compensates for inaccurate airflow data.
The check engine light activates, often accompanied by codes like P0101 or P0171.
Rough idling or stalling occurs, especially at low speeds or when stopping.
Black smoke may emit from the exhaust, indicating an overly rich fuel mixture.
Parts to Replace
OEM Audi Mass Air Flow Sensor 06C133471A The Genuine VW/Audi Audi Mass Air Flow Sensor 06C133471A is an essential component for maintaining optimal engine performance in your Audi vehicle.
Hitachi Audi Mass Air Flow Sensor MAF0036 The Hitachi Audi Mass Air Flow Sensor (MAF0036) is an essential component designed to optimize your vehicle's performance by accurately measuring the volume of air entering the engine.
P0201–P0208 indicate injector circuit faults; P0300–P0308 show misfires; P0171 and P0175 reflect lean/rich fuel trim imbalances.
Why it happens:
Fuel injector failure stems from contamination, electrical faults, seal wear, poor fuel quality, heat soak, and neglected filter or maintenance routines.
Symptoms:
Engine misfires: A clogged or malfunctioning injector disrupts fuel delivery, causing uneven combustion and noticeable hesitation during acceleration.
Rough idle: The engine shakes or vibrates at rest due to inconsistent fuel flow from one or more faulty injectors.
Poor fuel economy: Leaking or inefficient injectors lead to excess fuel consumption and reduced mileage.
Check engine light: Fault codes like P0201–P0208 or P0300–P0308 may trigger the warning light due to injector-related misfires.
Fuel odor: A leaking injector can release raw fuel into the engine bay or exhaust, producing a strong gasoline smell.
Parts to Replace
OEM Audi Fuel Injector 078133551BL The Genuine VW/Audi Audi Fuel Injector 078133551BL is an essential component for maintaining optimal engine performance in select Audi models.
GB Reman Audi Fuel Injector (Rebuilt) - 85212178 The GB Audi Fuel Injector (Rebuilt) 852-12178 is engineered to meet OEM standards, providing premium-grade construction and reliable performance.
Standard Fuel Injector Part # FJ879 Standard Ignition FJ879 is an OEM replacement fuel injector for Audi 2.7L engines, ensuring precise fuel delivery and performance.
P2111, P2112, P0638, and P0121 indicate throttle actuator faults—stuck plate, control circuit errors, and sensor signal issues.
Why it happens:
Throttle body failure occurs from carbon buildup, electrical faults, poor maintenance, heat damage, contaminated fuel, and worn sensors disrupting airflow control.
Symptoms:
Rough idle: The engine fluctuates or stalls at rest due to disrupted airflow from a dirty or malfunctioning throttle body.
Poor acceleration: Hesitation or uneven throttle response occurs when the air-fuel mixture is improperly regulated.
Check engine light: Fault codes like P2111, P2112, P0638, or P0121 may trigger due to throttle actuator or sensor faults.
Engine misfires: Inconsistent air intake causes incomplete combustion, leading to misfires and reduced performance.
Reduced fuel efficiency: A faulty throttle body can cause rich or lean mixtures, increasing fuel consumption and emissions.
Parts to Replace
OEM Audi Throttle Body 079133062C The Genuine VW/Audi Fuel Injection Throttle Body, part number 079133062C, is a premium-grade replacement designed specifically for various Audi models.
Bosch Audi Throttle Body - 0280750489 The Bosch Throttle Body part number 0280750489 is a premium-quality replacement component designed specifically for Audi and Volkswagen vehicles.
P0230, P0231, P0089, and P0191 indicate fuel system faults - relay, pressure sensor, or regulator issues causing delivery instability.
Why it happens:
Electric fuel pump failure occurs from overheating, low fuel levels, contamination, poor wiring, clogged filters, aging components, or incorrect fuel use.
Symptoms:
Engine Sputtering at High Speeds: The engine may sputter or hesitate when driving fast due to inconsistent fuel delivery.
Hard Starting or No Start: The vehicle may struggle to start or fail to start entirely if the pump can't pressurize the fuel system.
Loss of Power Under Load: Acceleration may weaken, especially on inclines or during towing, as the pump fails to meet fuel demands.
Sudden Engine Stalling: The engine may stall unexpectedly while driving, often without warning, from fuel starvation.
Whining Noise from Fuel Tank: A loud whining or humming sound from the tank can signal a failing or overheating fuel pump motor.
Parts to Replace
OEM Audi Fuel Pump Assembly 4B0906087P The Audi Fuel Pump Assembly 4B0906087P is a premium-grade component designed to provide optimal fuel pressure to your vehicle's injection system.
Hella Volkswagen Audi Fuel Pump 358106261 The Hella Fuel Pump 358106261 is engineered to meet or exceed OEM standards, providing reliable fuel delivery for a variety of Audi and Volkswagen models.
Bosch Audi Fuel Pump Module Assembly - 69361 The Bosch Fuel Pump Module Assembly part number 69361 is engineered to meet the highest industry standards, ensuring reliable performance and durability for your Audi.
P0571 indicates a brake switch circuit fault, disabling cruise control, affecting brake lights, and potentially impairing gear shifting and safety systems.
Why it happens:
Brake light switch failure occurs from wear, corrosion, misalignment, electrical faults, moisture intrusion, pedal stress, poor materials, or connector damage.
Symptoms:
Brake lights stay on constantly, even when the pedal isn’t pressed, draining the battery and confusing other drivers.
Brake lights don’t illuminate at all, creating a serious safety hazard during deceleration.
Cruise control stops working, as the system relies on brake switch input to disengage properly.
Gear selector won’t shift out of Park, especially in automatic transmissions that require brake pedal confirmation.
Dashboard warning lights appear, such as ABS or traction control alerts, due to disrupted sensor communication.
Parts to Replace
Audi VW Brake Light Switch 1K2945511RDW The Genuine VW/Audi Brake Light Switch part number 1K2945511 RDW is an essential component designed to enhance safety and reliability in your Audi.
Audi VW Brake Light Switch 4015013 The OEM Brake Light Switch part number 4015013 is an essential replacement component designed specifically for Audi and Volkswagen vehicles.
P0562, P0620, and U1113 indicate voltage drop, generator circuit fault, and lost A/C pressure sensor communication - causing drivability issues.
Why it happens:
Alternator failure stems from worn bearings, heat damage, corroded wiring, bad diodes, poor grounding, or ECU faults disrupting voltage regulation.
Symptoms:
The battery warning light illuminates, often shaped like a battery or labeled “ALT” or “GEN.”
Headlights and interior lights dim or flicker due to unstable voltage output.
Electrical accessories like power windows or infotainment systems operate sluggishly or intermittently.
The engine stalls or struggles to start as battery charge depletes without alternator support.
A whining or growling noise may come from the engine bay, indicating worn alternator bearings or internal damage.
Parts to Replace
TYC Alternator 2-13922 Enhance the performance of your vehicle with the TYC Alternator 2-13922. Engineered to OEM standards, this alternator ensures reliable power generation for your vehicle's electrical systems.
Audi VW Alternator (120A) (New)- 439263 The Valeo Alternator (120A) is a premium-grade replacement part engineered to OEM standards, ensuring optimal performance and reliability.
P0615 and P0688 indicate starter relay and ECM power relay circuit faults, causing no-start, stalling, or intermittent electrical failure.
Why it happens:
Starter failure occurs from worn brushes, solenoid damage, overheating, poor electrical connections, oil contamination, corrosion, or excessive ignition cycle stress.
Symptoms:
Clicking Sound When Turning the Key: A single loud click without engine crank often signals a faulty starter solenoid or worn internal contacts.
Grinding Noise During Start Attempt: Metal-on-metal grinding suggests the starter gear isn’t properly engaging the flywheel, risking severe mechanical damage.
Slow or No Crank: The engine may crank sluggishly or not at all, indicating the starter motor is struggling or completely inoperative.
Intermittent Starting: Sometimes the engine starts, sometimes it doesn’t—pointing to worn brushes or failing electrical connections inside the starter.
Smoke or Burning Smell: Overheating from repeated failed starts or electrical faults can cause smoke or a burning odor near the starter.
Parts to Replace
Bosch Audi VW Starter Motor (Rebuilt)- SR0422X This starter motor is engineered to OEM standards, delivering reliability and performance you can depend on.
Denso Audi VW Starter Motor- 2805364 The DENSO Starter Motor 280-5364 is engineered to OEM standards, making it a reliable choice for your Audi or Volkswagen vehicle.
Rough idling or stalling emerges as the ECU struggles to maintain stable engine operation.
Check Engine Light illuminates when the ECU detects irregular or missing camshaft sensor signals.
Parts to Replace
OEM Audi VW Camshaft Position Sensor 058905161B The Genuine VW/Audi Camshaft Position Sensor (MPN: 058905161B) is engineered to meet or exceed OEM standards, ensuring reliable performance and longevity.
Bosch Audi VW Camshaft Position Sensor- 0232101024 The Bosch Camshaft Position Sensor 0232101024 is an essential component for maintaining optimal engine performance in a variety of Audi and Volkswagen models.
Differential bearing failure stems from fluid neglect, overload, contamination, misalignment, heat, or wear - causing gear damage, noise, and drivability issues.
Symptoms:
Whining or howling noises increase during acceleration or deceleration, indicating worn or improperly lubricated differential bearings.
Vibrations through the drivetrain intensify with speed, often caused by bearing wear or misalignment.
Gear grinding or clunking sounds suggest internal damage from bearing failure affecting gear mesh.
Poor handling or cornering instability results from uneven torque distribution due to compromised differential support.
Excessive tire wear, especially on inner edges, may occur from differential binding or improper wheel speed compensation.
Parts to Replace
Left 016409123 The Genuine VW/Audi Differential Bearing, part number 016409123, is an essential component for Audi owners aiming to replace worn or damaged carrier bearings.
Right 113517185B Engineered to OEM standards, this premium-grade component ensures the precise positioning of the differential in your vehicle, contributing to optimal performance and reliability.
Sachs Audi Clutch Flywheel -DMF91123 The Sachs Clutch Flywheel part number DMF91123 is engineered to deliver exceptional performance for your Audi vehicle.
Luk Flywheel Part # DMF027 The LUK Flywheel is an essential component of your vehicle's clutch system, playing a crucial role in connecting the engine to the transmission.
Clutch master and slave cylinder failure occurs from seal wear, fluid contamination, corrosion, heat, poor maintenance, or incorrect hydraulic fluid.
Symptoms:
Spongy or soft clutch pedal indicates air or fluid leaks in the hydraulic system, often due to worn seals.
Clutch pedal sticking to the floor suggests internal seal failure or fluid loss preventing proper pressure buildup.
Difficulty shifting gears results from insufficient hydraulic force failing to disengage the clutch fully.
Visible fluid leaks near the firewall or transmission point to compromised master or slave cylinder seals.
Low or contaminated clutch fluid in the reservoir signals internal wear, corrosion, or improper maintenance.
Parts to Replace
FTE Audi VW Clutch Master Cylinder- KG19008001 The FTE Clutch Master Cylinder, part number KG190080.0.1, is engineered to meet the highest standards of quality and reliability, making it an essential replacement part for your Audi or Volkswagen vehicle.
Sachs Audi VW Clutch Master Cylinder - SH5268 The Sachs Clutch Master Cylinder part number SH5268 is a premium-quality replacement component designed specifically for Audi and Volkswagen vehicles.
LuK Audi VW Clutch Master Cylinder LMC460 The LuK Clutch Master Cylinder, part number LMC460, is a top-tier replacement component designed specifically for Audi and Volkswagen vehicles.
The C5-generation Audi A6 2.7T blends executive-class comfort with twin-turbocharged performance and Quattro all-wheel-drive confidence. Powered by the robust 2.7L V6 biturbo (engine code APB), it delivers refined torque, smooth acceleration, and dynamic road control. But as these vehicles age past the 20-year mark, components such as turbocharger actuators, ignition coils, vacuum hoses, and control arms begin to show signs of wear. That’s where eEuroparts.com comes in offering the OE-quality parts and technical know-how you need to keep your A6 running strong.
Exceptional Delivery, Unmatched Logistics
We know that every moment counts when your car is out of commission. That’s why we focus on getting your parts to you as quickly as possible. Our efficient logistics network and fast shipping mean minimal downtime for your vehicle.
Competitive Prices, Superior Value
Our catalog includes everything from timing chains, camshaft adjusters, and PCV valves to wheel bearings, control arms, and fuel pumps, sourced to meet or exceed OE standards. Whether you prefer genuine Audi parts or trusted aftermarket brands, we offer top-tier quality at better-than-dealer pricing.
Trusted Excellence
Our catalog includes parts from top-tier brands like Bosch, INA, ZF, Pierburg, Elring, Lemforder, and Rein. Whether you're resolving transmission issues, electrical faults, or suspension wear, our parts meet or exceed OEM standards for fit, durability, and performance.
Conclusion
Whether you're chasing better boost response, hunting down a CEL, or planning preventive suspension maintenance, eEuroparts.com has the parts and service insight you need to keep your Audi A6 2.7T performing with precision mile after turbocharged mile.
Frequently Asked Questions
Why does my Audi A6 2.7 TFSI lose power and blow smoke under acceleration? ⌄
Often failing turbochargers (P0299/P0234) from oil starvation or bearing wear. Watch for whining noises, boost loss, and blue/grey exhaust.
Why is my fuel economy dropping and exhaust smelling odd? ⌄
Failed oxygen or EGT sensors (P0130–P0161/P0544) skew air-fuel ratios. Causes include poor MPG, sulfur odors, rough idle, and emissions test failures.
Why do I hear whining or clunking from the drivetrain? ⌄
Differential bearing wear or failing flywheel can cause noises and vibration. Look for highway-speed hum, gear chatter, or clutch pedal vibration.
Why won’t my Audi’s brake lights or cruise control work properly? ⌄
A bad brake light switch (P0571) or seized rear caliper. Symptoms include lights staying on, cruise disabled, or car pulling while braking.
What causes a hard brake pedal on this model? ⌄
A leaking brake booster or failed vacuum pump reduces assist (P0556/P1479). Expect hissing noises, stiff pedals, and longer stopping distances.
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Apr 13, 2025Celebrating 25 Years of Excellence at eEuropartsSince its inception in 2000, eEuroparts has been dedicated to providing European car owners and enthusiasts throughout the United States with top-quality Genuine, OEM, and premium aftermarket parts. What started as a small passion project has evolved into a prominent player in the auto parts sector, renowned for its dependability, swift shipping, and unparalleled customer service. Over the years, we've successfully processed more than 20 million orders, ensuring that premium European parts are accessible no matter your location.
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