• Your cart is empty
      0
      items

      Subtotal:$0.00

    :

    Clear
    Clear
    Previous imageNext image
    • Clearance

        Valeo 439851 - Alternator

        MPN: 439851

        The Valeo 439851 Alternator ensures efficient power generation for your Audi or Volkswagen. Engineered to OEM standards for optimal reliability and performance.

        0.0
        Vehicle Specific
        Check if this part fits your vehicle.
          • 44% less
          Market price: $502.95, you save $221.00
        • $281.95
        In stock

        Product Overview

        The Valeo 439851 Alternator is a premium-grade replacement part engineered to OEM standards, specifically designed for select Audi and Volkswagen vehicles. This alternator plays a crucial role in your vehicle's electrical system by converting mechanical energy from the engine into electrical energy, ensuring all electrical components are powered and the battery is recharged effectively. With OE-level quality, reliability, and fitment accuracy, you can trust this alternator to perform optimally. Choose Valeo 439851 for dependable performance and peace of mind every time you service your vehicle.

        Cross Reference Numbers

        This Valeo 439851 is equivalent to or replaces the following part numbers: 06J903023Q, 11810, 11729, 11155, TG14C055, 20303N.

        Vehicle Compatibility

        • Audi TT Quattro 2.0 L4 (2013–2015)
        • Audi TT Quattro Premium Plus 2.0 L4 (2013)
        • Audi TT Quattro Prestige 2.0 L4 (2013)

        This may also fit other applications. Please use the vehicle selector tool to verify fitment.

        Why Shop at eEuroparts.com?

        • Proven Expertise: Over 25 years of experience with European vehicles means we know your car inside and out.
        • Exclusive Kits That Fit™ - complete repair solutions with no guesswork
        • Fitment Confidence: Our accurate cataloging ensures you get the right part the first time.
        • Fast, Reliable Shipping: Orders ship quickly from our U.S.-based warehouses.
        • Transparent Pricing: Competitive prices with no hidden fees or surprise charges.
        • Established Trust: Serving the European auto community since 2000.

        Frequently Asked Questions

        What does the Valeo 439851 Alternator do?

        The alternator converts mechanical energy from the engine into electrical energy, powering the vehicle's electrical systems and recharging the battery.

        How do I know if my Alternator needs replacement?

        Common symptoms of a failing alternator include dimming lights, a dead battery, unusual noises from the engine area, and a battery warning light illuminated on the dashboard.

        Can I install the Valeo 439851 myself?

        Yes, the installation of the Valeo 439851 alternator can be done by DIY enthusiasts with basic automotive knowledge. However, it is recommended to follow safety precautions and refer to the vehicle's service manual for specific instructions.

        What are the symptoms of a faulty Alternator?

        Symptoms of a failing alternator include flickering dashboard lights, battery warning light activation, and electrical accessories not functioning properly. If you experience these issues, it may indicate a failing alternator.

        Why should I choose Valeo for my Alternator needs?

        Valeo is a trusted name in the automotive industry, known for its commitment to quality and performance. Order Valeo 439851 today for a factory-correct replacement that restores safety and performance.

        Note: All information on this page and in the FAQ is for general reference only. Verify fitment and consult a professional as needed. eEuroparts.com is not responsible for incorrect part selection or installation.

          • eEuroparts SKU
            31803
          • Weight
            16.88 lbs
          • Dimensions (L x W x H)
            8.74 x 7.87 x 10.35 in
          • Barcode
            03276424398512
          • Manufacturer Part #
            439851
        • Brand
          Valeo
        • Manufacturer
          Valeo
        • MPN
          439851
        • Part Type
          Alternator
        • OE Part Numbers
          06J903023Q
        • Cross Reference Numbers
          20303N, 11729, 11810, TG14C055, 11155
        • Features
          Amperage Rating : 140
          California Proposition 65 : WARNING: N/A for this product.
          Family : Valeo OE
          Fan Type : Internal
          Housing Material : Aluminium
          Pulley Diameter : 57.2
          Pulley Groove Quantity : 6
          Rotation Direction : Clockwise
          Technical Number : TG14C055
          Voltage : 12
        • Fitment
          • Fitment Type
            Vehicle Specific
        YearMakeModelSubmodelNotes
        2015AudiTT QuattroBase (2.0 L4 GAS)Aspiration: Turbocharged, Engine: CETA, Valves: 16, Notes: 140 Amp, Valeo is the Original Equipment Manufacturer
        2014AudiTT QuattroBase (2.0 L4 GAS)Aspiration: Turbocharged, Engine: CETA, Valves: 16, Notes: 140 Amp, Valeo is the Original Equipment Manufacturer
        2013AudiTT QuattroPrestige (2.0 L4 GAS)Aspiration: Turbocharged, Engine: CETA, Engine: CDMA, Valves: 16, Notes: 140 Amp, Valeo is the Original Equipment Manufacturer
        2013AudiTT QuattroPremium Plus (2.0 L4 GAS)Aspiration: Turbocharged, Engine: CETA, Engine: CDMA, Valves: 16, Notes: 140 Amp, Valeo is the Original Equipment Manufacturer
        Customer reviews
        Please sign in to add review
        There are no comments yet. Be the first to leave a comment

        We accept the following payment methods:

        Accepted payment methods

        Warranty Overview

        At eEuroparts, we stand behind the quality of the products we sell. Every part we offer is backed by a warranty designed to give you peace of mind and protect your investment.

        Standard Warranty – Most Parts

        • Coverage: 2 years or 24,000 miles (whichever comes first) from purchase date.

        • Protection: Defects in materials or workmanship under normal personal use.

        • Eligibility: Applies only to the original purchaser and the vehicle where the part was first installed.

        • Exclusions:

          • Wear-and-tear items (brake pads, filters, bulbs, wipers, etc.)

          • Commercial, fleet, rideshare, off-road, or racing use

          • Improper installation, misuse, accidents, or modifications

        • Not Covered: Labor, shipping, towing, or incidental costs.

        Bison Performance Warranty – Our House Brand

        • Coverage: Limited Lifetime Warranty for as long as you own your vehicle.

        • Applies To: All products sold under the Bison Performance label.

        • Premium Protection: Goes beyond our standard warranty — if it’s a Bison product, the 2-year/24k mile limit is replaced with lifetime coverage.

        • Exclusions: Same as the standard warranty (normal wear, commercial use, improper installation, etc.).

        • What’s Included: Replacement of the defective product (labor and shipping excluded).

        Warranty Claim Requirements

        To keep claims fast and fair, we require:

        • Proof of purchase (invoice or order confirmation).

        • Photos or videos showing the defective part, order number, date, VIN, and odometer reading.

        • Diagnostic reports or part returns for non-visible issues may be requested.

        • Claims must be truthful, properly documented, and reflect normal consumer use.

        Buy With Confidence: We back our products because we believe in their quality, with a transparent, customer-first warranty process you can trust. And with Bison Performance products, you’ll enjoy Limited Lifetime protection—an assurance few brands can match.

        For full details and exclusions, please see our complete Warranty Terms & Conditions.

        This summary is for convenience only. For full warranty coverage details, exclusions, and requirements, see our official Warranty Terms & Conditions. In case of conflict, the full policy governs.

        Return Policy Overview

        Most parts can be returned within 30 days of delivery if unused, uninstalled, and in original packaging.
        To start a return, contact customer support via Chat or Contact Us.

        • Restocking fee: Up to 20% may apply for certain orders (buyer’s remorse, order errors, or special-order items)

        • Refunds: Issued to your original payment method within 3–5 business days after inspection

        • Exchanges: Not automatic — please return and reorder

        • Replacements: May be approved for incorrect or defective items reported within 7 days

        Not returnable:

        • Used or installed parts

        • Electrical components

        • Opened filter kits, gaskets, or contaminated items

        • Final sale or custom orders

        Important Notes:

        • Return shipping is your responsibility unless we made a verified error

        • Fitment is the customer’s responsibility (we can assist, but do not guarantee)

        • Country of origin may vary and is not grounds for return

        For complete details, please see our full Return Policy.


        This Returns summary is provided for convenience only. All returns, refunds, and exchanges are subject to the complete Returns Policy. In the event of any conflict, the full policy governs.

        Fast, Reliable Shipping — Straight to Your Door

        We ship most orders the same day when placed before 2 PM CST (Monday–Friday). Our main warehouse is just east of Nashville, TN, and we also ship from multiple locations nationwide to get your order to you as quickly as possible.

        • We use trusted carriers like UPS, FedEx, and USPS.

        • Tracking info is emailed to you as soon as your order ships.

        • Delivery estimates at checkout are based on carrier data, but not guaranteed.

        Need help with a shipment?

        If your order is missing, damaged, or incorrect, just let us know within 5 days of delivery. We’ll walk you through the quick claim process — including a few photos to help us make things right.

        For complete details, please see our full Shipping Policy.


        This Shipping summary is provided for convenience only. Delivery times, carrier terms, fees, restrictions, risk of loss, and other details are governed by our complete Shipping Policy. In the event of any conflict, the full policy governs.

        Product questions

        No questions yet. Be the first to ask the question!