In this Vehicle Platform Guide, you will find the top common issues of Mercedes-Benz C300 (W204, 2008–2012) 3.0L V6 Gasoline Naturally-Aspirated 7G-Tronic / 4Matic, along with their fault codes, and the solutions from eEuroparts.com.
The Mercedes-Benz C300 (W204), produced from 2008 to 2012, is a luxury compact sedan powered by a 3.0L naturally aspirated V6 gasoline engine, delivering smooth and reliable performance. It features the 7G-TRONIC automatic transmission, ensuring seamless gear shifts for a refined driving experience. Available with 4MATIC all-wheel drive, this model provides enhanced traction and stability, making it suitable for various road conditions. The C300 is equipped with premium features such as high-quality leather upholstery, advanced infotainment systems, and innovative safety technologies, ensuring comfort, connectivity, and security for its occupants.
Specifications
Engine and Powertrain
Engine:
3.0L V6 Naturally Aspirated (M272)
Engine Code:
M272 E30
Transmission:
7-Speed Automatic (7G-Tronic)
Fuel Type:
Gasoline
Horsepower:
~231 hp @ 6,000 rpm
Torque:
~221 lb-ft @ 2,700–5,000 rpm
Fuel Economy (EPA Estimates)
City/Highway Combined:
~ 17-25 MPG
Vehicle Weight
Curb Weight:
~ 3,583 lbs
Gross Weight:
~ 4,575 lbs
Configurations and Submodels
Body Styles:
Sedan
Seating Capacity:
5 passengers
Drivetrain Options:
Base (Rear-Wheel Drive - RWD) 4Matic (All-Wheel Drive - AWD)
Top Common Issues with Mercedes-Benz C300 (W204, 2008–2012) 3.0L V6 Gasoline Naturally-Aspirated 7G-Tronic / 4Matic
ABS Wheel Speed Sensor
1. ABS Wheel Speed Sensor Failure
Fault Codes:
C0035–C0050 fault codes indicate issues with wheel speed sensors, varying by wheel location, and often relate to ABS or traction control system malfunctions.
Why it happens:
Occurs due to dirt or debris buildup, damaged sensor wiring, corrosion on the tone ring, or normal wear from constant exposure to heat, moisture, and road grime.
P0571 indicates a malfunction in the cruise control/brake switch circuit, while C0040 points to an issue with the right front wheel speed sensor, often affecting ABS or traction control systems.
Why it happens:
Brake light switch failure typically occurs due to wear and tear, corrosion, or faulty wiring, which disrupts the electrical circuit responsible for activating the brake lights.
Symptoms:
Brake Lights Not Working: The lights may fail to illuminate when the brake pedal is pressed.
Brake Lights Staying On: The lights remain on even when the pedal is not engaged.
Difficulty Shifting Out of Park: The gear selector may be stuck in "Park" due to the switch malfunction.
Car Won't Start: In vehicles requiring the brake pedal to be pressed for ignition, the car may fail to start.
Cruise Control Issues: Cruise control may not deactivate properly when braking.
Dashboard Warning Lights: ABS or traction control warning lights may illuminate.
Parts to Replace
The Standard Ignition SLS-385 Brake Light Switch is designed to ensure the proper operation of your vehicle's brake lights, enhancing safety and compliance on the road.
Front lower control arm bushing failure typically occurs due to wear and tear, exposure to harsh driving conditions, or deterioration from aging and environmental factors.
Symptoms:
Vibrating Steering Wheel: Noticeable vibrations, especially during acceleration.
Clunking or Banging Noises: Sounds from the suspension when driving over bumps or rough terrain.
Uneven Tire Wear: Tires wearing out irregularly due to misalignment.
Steering Wander: Difficulty keeping the vehicle straight as it pulls to one side.
Reduced Braking Performance: A decrease in braking efficiency due to instability.
Decreased Ride Comfort: A rougher and less stable driving experience.
Strut mount wear in the front suspension typically occurs due to prolonged exposure to road vibrations, harsh driving conditions, or deterioration of the rubber components over time.
Symptoms:
Noisy Turns: Squeaking or clunking sounds when steering, especially at low speeds.
Uneven Tire Wear: Irregular tread patterns due to misalignment.
Vibrations: Noticeable shaking or vibrations while driving.
Steering Trouble: Stiff or loose steering, sometimes accompanied by noise.
Poor Handling: Reduced stability and responsiveness during maneuvers.
Rear suspension toe link failure typically occurs due to excessive stress from frequent suspension articulation, harsh driving conditions, or material fatigue over time.
Symptoms:
Uneven or rapid tire wear
Clunking or knocking noise from the rear
Rear-end instability or wandering during driving
Poor alignment and handling issues
Steering feels loose or unpredictable at higher speeds
P0335 indicates a crankshaft position sensor circuit malfunction, while P0336 signals a range or performance issue with the crankshaft position sensor circuit.
Why it happens:
Crankshaft position sensor failure occurs due to wear and tear, electrical issues, magnetic interference, or contamination from debris, disrupting accurate engine timing signals.
Symptoms:
Check Engine Light: The warning light may illuminate due to disrupted timing signals.
Difficulty Starting: The engine may struggle to start or fail to start altogether.
Engine Stalling: The engine may stall unexpectedly, especially at low speeds.
Poor Acceleration: Sluggish or uneven acceleration may occur.
Engine Misfires: Irregular combustion can lead to misfires and rough engine performance.
Reduced Fuel Efficiency: Inefficient timing can increase fuel consumption.
Steering Knuckle failure typically occurs due to fluid contamination, low fluid levels, or excessive wear from prolonged use and harsh driving conditions.
Symptoms:
Stiff Steering: Difficulty turning the steering wheel, especially at low speeds.
Noises: Whining, squealing, or groaning sounds when turning the wheel or starting the engine.
Jerky Steering: Rough or inconsistent steering response.
Fluid Leaks: Visible hydraulic fluid leaks under the vehicle.
Metal Flakes in Fluid: Contaminated power steering fluid with metallic particles.
Dashboard Warning Lights: Illuminated power steering or related warning indicators.
Parts to Replace
Passenger Side 2043320201 The Genuine Mercedes-Benz Steering Knuckle is a high-quality replacement part that is designed to meet the strict standards and specifications set by Mercedes-Benz.
Driver Side 2043320101 The Genuine Mercedes-Benz Steering Knuckle part number 2043320101 / 204 332 01 01 is an essential component of your Mercedes-Benz vehicle.
Inner tie rod end wear typically occurs due to constant stress from steering movements, exposure to road debris, or lack of lubrication, leading to gradual deterioration over time.
Symptoms:
Loose Steering: The steering wheel may feel unresponsive or have excessive play.
Uneven Tire Wear: Irregular tread patterns due to misalignment caused by worn tie rods.
Vibrations: Noticeable shaking or vibrations in the steering wheel while driving.
Clunking Noises: Strange sounds, especially during turns or over bumps.
Pulling to One Side: The vehicle may drift or pull to one side, indicating alignment issues.
Parts to Replace
Driver Side (Outer) PART # ES800863 The Moog Steering Tie Rod End part number ES800863 is an essential part for your Mercedes-Benz, designed to ensure smooth and precise steering performance.
P2017 indicates an issue with the intake manifold runner position sensor circuit, P2004 signals the intake manifold runner control stuck open, and P2006 highlights the intake manifold runner control stuck closed.
Why it happens:
Intake manifold failure occurs due to heat stress, vacuum leaks, faulty gaskets, or carbon buildup, disrupting air-fuel mixture distribution and engine performance.
Symptoms:
Check Engine Light: The warning light may illuminate due to air-fuel mixture issues.
Engine Misfires: Disrupted airflow can cause irregular combustion, leading to misfires.
Rough Idle: The engine may run unevenly, especially when stationary.
Reduced Performance: Noticeable loss of power and sluggish acceleration.
Increased Fuel Consumption: Inefficient combustion leads to higher fuel usage.
Coolant Leaks: In some cases, external coolant leaks may occur.
P0010 indicates a camshaft position actuator circuit malfunction, P0011 signals over-advanced camshaft timing, P0020 highlights an issue with the camshaft position actuator circuit in Bank 2, and P0021 denotes over-advanced camshaft timing in Bank 2.
Why it happens:
Camshaft adjuster solenoid failure occurs due to contaminated oil, electrical issues, wear and tear, or physical damage, disrupting the variable valve timing system's functionality.
Symptoms:
Check Engine Light: The warning light may illuminate due to variable valve timing system issues.
Rough Idle: The engine may run unevenly or vibrate when stationary.
Reduced Fuel Efficiency: Inefficient valve timing can lead to higher fuel consumption.
Poor Engine Performance: Noticeable loss of power and sluggish acceleration.
Engine Misfires: Irregular combustion caused by improper valve timing.
P0100 indicates a mass air flow (MAF) circuit malfunction, P0101 signals a MAF circuit range/performance issue, P0102 highlights low input in the MAF circuit, and P0103 denotes high input in the MAF circuit.
Why it happens:
Mass Air Flow (MAF) sensor failure occurs due to contamination, electrical issues, aging, or physical damage, leading to inaccurate air intake measurements.
Symptoms:
Check Engine Light: The dashboard warning light may illuminate due to incorrect sensor readings.
Poor Fuel Efficiency: Increased fuel consumption caused by inaccurate air intake measurements.
Rough Engine Performance: Hesitation, rough idling, or jerky acceleration.
Hard Starting Conditions: Difficulty starting the vehicle due to disrupted air-fuel mixture.
Engine Stalling: The engine may stall or struggle to stay running.
Black Smoke from Exhaust: Excessive fuel combustion can lead to visible black smoke.
Parts to Replace
Bosch Mercedes Mass Air Flow Sensor 0280218190 is an OEM-quality component designed for precise air intake measurement and optimal engine performance. It is compatible with various Mercedes-Benz models.
An oil cooler seal leak occurs due to wear and tear, improper installation, thermal expansion, or exposure to contaminants, compromising the seal's integrity.
Symptoms:
Visible Oil Leaks: Oil may drip or pool under the vehicle, especially near the engine area.
Engine Overheating: Insufficient cooling can lead to higher engine temperatures.
Oil in Coolant: A milky or oily appearance in the coolant reservoir may indicate a leak.
Coolant in Oil: Foamy or milky oil on the dipstick suggests contamination.
Reduced Engine Performance: Sluggish acceleration or misfires due to overheating.
The P0128 fault code indicates that the engine's coolant temperature is below the thermostat's regulating temperature, often due to a stuck-open thermostat or issues with the cooling system.
Why it happens:
Thermostat failure often occurs due to wear and tear, debris buildup, or manufacturing defects, leading to improper regulation of coolant flow and engine temperature.
Symptoms:
Overheating Engine: If the thermostat is stuck closed, the engine may overheat due to restricted coolant flow.
Trouble Reaching Operating Temperature: A stuck-open thermostat can prevent the engine from warming up properly, leading to inefficient performance.
Temperature Fluctuations: Erratic thermostat behavior can cause inconsistent engine temperature readings.
Coolant Leaks: A faulty thermostat may lead to coolant overflow and visible leaks.
Heater Malfunction: In colder climates, a stuck-open thermostat can result in insufficient cabin heating.
P0115 and P0116 indicate issues with the engine coolant temperature sensor circuit, while P2185 signals a malfunction in the coolant temperature sensor for the radiator outlet.
Why it happens:
Coolant temperature sensor failure typically occurs due to prolonged exposure to high temperatures, electrical issues like corrosion or wiring damage, or contamination in the coolant system.
Symptoms:
Check Engine Light: A faulty sensor often triggers the check engine light.
Engine Overheating: Incorrect readings can prevent the cooling system from functioning properly.
Poor Fuel Economy: A malfunctioning sensor may cause inefficient fuel mixture adjustments.
Rough Idle or Stalling: Disrupted engine performance can lead to rough idling or stalling.
Inaccurate Temperature Readings: The dashboard gauge may show erratic or incorrect temperature values.
Difficulty Starting: Problems with the sensor can make it harder to start the engine.
P0201–P0206 indicate injector circuit malfunctions in specific cylinders, while P0300–P0306 signal engine misfires.
Why it happens:
Fuel injector failure typically occurs due to clogging, contamination, electrical issues, or wear from prolonged use under high pressure and temperature.
Symptoms:
Engine Misfires: Faulty injectors can disrupt fuel delivery, causing misfires.
Rough Idle: Uneven fuel supply may lead to a shaky or rough idle.
Poor Acceleration: Sluggish response when pressing the gas pedal.
Decreased Fuel Efficiency: Inefficient fuel atomization can lower mileage.
Check Engine Light: A malfunctioning injector often triggers this warning.
Fuel Odor: Leaking injectors may cause a noticeable fuel smell.
Parts to Replace
PART # 852-12240 The GB Fuel Injector is a high-quality replacement option for your Mercedes-Benz vehicle.
Part # 852-12224 manufactured by GB Reman , it is a high-quality replacement designed to ensure efficient fuel delivery and optimal engine performance.
Power steering pump failure often occurs due to fluid leaks, contamination, or wear and tear, leading to reduced hydraulic pressure and steering assistance.
Symptoms:
Heavy or Stiff Steering: Difficulty turning the wheel, especially at low speeds. Whining or Squealing Noises: Unusual sounds when turning the steering wheel. Jerky or Rough Steering: Inconsistent steering response. Fluid Leaks: Visible power steering fluid leaks under the vehicle. Groaning or Knocking Sounds: Persistent noises indicating internal pump issues. Power Steering Warning Light: Dashboard warning light activation.
Parts to Replace
Part # KS01000698 manufactured by Bosch, it is a high-quality replacement designed to restore smooth and efficient steering performance.
PART # KS00001889 The Bosch Power Steering Pump is a high-quality replacement part designed for use in Mercedes-Benz vehicles.
P0562 and P2503 indicate low system or charging voltage, P0620 signals a generator control circuit issue, and B1800 points to an alternator communication error.
Why it happens:
Alternator failure typically occurs due to wear and tear, electrical issues like corroded wiring, overheating, or excessive strain from charging a weak or dead battery.
Symptoms:
Dim or Flickering Lights: Headlights and interior lights may appear weak or inconsistent.
Dead Battery: A failing alternator can prevent the battery from charging, leading to frequent battery issues.
Electrical Malfunctions: Power windows, radio, or air conditioning may operate sluggishly or stop working.
Warning Light: The dashboard may display a battery-shaped warning light or "ALT"/"GEN" indicator.
Unusual Noises: Whining, grinding, or growling sounds from under the hood.
Burning Smell: Overheating alternator components may emit a rubber-like burning odor.
Engine Stalling: Insufficient power supply can cause the engine to stall unexpectedly.
Parts to Replace
Bosch Mercedes Alternator AL0844N is a high-quality replacement designed to ensure efficient power generation and reliable performance.
B1660 indicates a passenger airbag ON/OFF indicator circuit malfunction, while B1661 signals a fault in the seat belt pretensioner circuit.
Why it happens:
Headlight control unit failure often occurs due to electrical faults, overheating, moisture intrusion, or wear and tear from prolonged use.
Symptoms:
Flickering Lights: The headlights may flicker or turn off unexpectedly.
Dim or Inconsistent Illumination: Reduced brightness or uneven lighting output.
Headlights Not Turning On: Complete failure of the headlights to activate.
Error Messages: Dashboard warnings related to the lighting system.
Delayed Startup: Headlights take longer than usual to illuminate.
Intermittent Functionality: Lights may work sporadically or only on one side.
Parts to Replace
Magneti Marelli LRB860 - LED Headlight Control Module The Magneti Marelli LED Headlight Control Module, part number LRB860, is a premium-grade replacement part designed specifically for various Mercedes-Benz models.
The B1676 fault code indicates a battery pack voltage out of range, often linked to issues with the ABS module, such as blown fuses, poor electrical connections, or alternator problems.
Why it happens:
Window regulator failure often occurs due to wear and tear, poor design, dirt or debris in the window tracks, or electrical issues like faulty wiring or blown fuses.
Symptoms:
Non-Responsive Window: The window may not move up or down when the button is pressed.
Stuck Window: The window might get stuck in one position, either fully open or closed.
Unusual Noises: Grinding, clicking, or creaking sounds when operating the window.
Slow or Uneven Movement: The window may move sluggishly or at an inconsistent speed.
Crooked Window Alignment: The glass may tilt or appear misaligned during operation.
Window Falls or Won't Stay Up: The window may drop unexpectedly or fail to stay in place.
1. Automatic Transmission Control Solenoid Failure
Fault Codes:
P0750 and P0755 indicate malfunctions in shift solenoids A and B, respectively, while P2714 and P2709 signal issues with pressure control solenoids, affecting gear shifting and transmission performance.
Why it happens:
Automatic transmission control solenoid failure often occurs due to electrical issues, contaminated transmission fluid, or wear and tear from prolonged use.
Symptoms:
Delayed or Erratic Gear Shifts: Difficulty in smooth gear transitions, leading to unpredictable or delayed shifting.
Stuck in Gear: The transmission may remain locked in one gear, unable to shift up or down.
Skipping Gears: The vehicle might bypass certain gears during operation.
Transmission Warning Light: Activation of a warning light on the dashboard.
Hard Shifting: Rough or abrupt gear changes, causing a jarring driving experience.
Slipping Transmission: The vehicle may lose power or fail to maintain speed due to insufficient hydraulic pressure.
Parts to Replace
On valve body# F026001015 The Bosch Automatic Transmission Valve Body Solenoid is a high-quality replacement part that is designed to ensure the smooth operation of your Mercedes-Benz.
On valve body PART # F026001014 The Bosch Automatic Transmission Valve Body Solenoid is the perfect fit for your Mercedes-Benz vehicle.
P0741 indicates a torque converter clutch circuit performance issue or being stuck off, while P0730 signals an incorrect gear ratio, often caused by transmission or solenoid problems.
Why it happens:
Automatic transmission clutch plate wear occurs due to friction from frequent gear shifts, contaminated transmission fluid, or excessive strain from towing or stop-and-go driving.
Symptoms:
Slipping Transmission: The engine revs higher without a corresponding increase in vehicle speed.
Delayed Gear Engagement: A noticeable lag when shifting gears.
Burning Smell: Overheated clutch plates can emit a distinct odor.
Unusual Noises: Grinding or whining sounds during gear shifts.
Difficulty in Shifting Gears: Resistance or roughness when changing gears.
Reduced Fuel Efficiency: Worn clutch plates can lead to inefficient power transfer.
P0725 points to an engine speed input circuit fault, P0335 to a crankshaft position sensor issue linked to flywheel irregularities, and U0101 to lost communication with the TCM due to severe vibrations.
Why it happens:
Clutch flywheel failure often occurs due to excessive heat, wear from prolonged use, or improper engagement of the clutch system.
Symptoms:
Burning Smell: A distinct odor caused by excessive friction or overheating.
Difficulty Changing Gears: Trouble shifting gears smoothly or at all.
Slipping Gears: Engine revs increase without a corresponding rise in speed.
Vibrating Clutch Pedal: Noticeable vibrations when pressing the clutch.
Unusual Noises: Grinding or rattling sounds, especially at idle or during gear shifts.
Inconsistent Starting: Intermittent issues when starting the engine.
Parts to Replace
The LuK Clutch Flywheel DMF078 is the perfect fit for your Mercedes-Benz vehicle, providing you with the highest quality and durability you need.
eEuroparts offers a wide selection of OEM and well-reviewed aftermarket parts chosen for compatibility with Mercedes-Benz vehicles. Parts are listed with fitment details and trusted brand options to help you find components that are appropriate for routine maintenance and common repairs.
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 Mercedes-Benz 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 replacing worn items or addressing a specific fault, use these listings to identify likely parts and plan repairs. For vehicle-specific advice, consult a trusted technician to confirm fitment and service steps before installation.
Frequently Asked Questions
Is the Mercedes-Benz C300 a good choice for daily driving?⌄
Yes, the C300 offers a smooth ride, precise steering, and a comfortable interior that makes it an ideal choice for everyday commuting and longer road trips alike.
How often should I service my Mercedes-Benz C300 (2008–2012)?⌄
Regular maintenance every 10,000 miles or once a year is recommended. This helps keep the engine, transmission, and braking systems in top condition for long-term reliability.
What are some common issues C300 owners might face over time? ⌄
Owners sometimes experience issues like balance shaft wear, sensor faults, or suspension noise. Using high-quality OEM parts ensures lasting performance and fewer repairs.
Does the Mercedes-Benz C300 require premium gasoline?⌄
Yes, premium unleaded fuel is recommended to maintain engine performance, efficiency, and prevent premature wear in the fuel system.
Where can I find reliable replacement parts for my Mercedes-Benz C300? ⌄
You can find verified OEM and performance-grade replacement parts for the C300 at eEuroparts.com, ensuring perfect fitment and dependable quality for your vehicle.
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