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          Hitachi ALR0400-HU - Voltage Regulator

          MPN: ALR0400-HU
          The Hitachi ALR0400-HU Voltage Regulator ensures stable voltage levels in your vehicle, protecting electrical systems from fluctuations. Designed for easy installation and lasting performance.
          0.0
          Vehicle Specific
          Check if this part fits your vehicle.
          • $53.95
          In stock

          Product Overview

          The Hitachi Voltage Regulator part number ALR0400-HU is a high-quality replacement component designed for a variety of Audi and Volkswagen vehicles. This part ensures stable and reliable performance by regulating voltage levels, thereby protecting your vehicle's electrical systems from fluctuations. With advanced technology and premium-grade construction, this voltage regulator is engineered to OEM standards, ensuring a perfect fit and optimal functionality. Choose Hitachi ALR0400-HU for dependable performance and peace of mind every time you service your vehicle.

          Cross Reference Numbers

          This Hitachi ALR0400-HU is equivalent to or replaces the following part numbers: 06E903803F, 07K903803.

          Vehicle Compatibility

          • Audi allroad 2.0 L4 (2013–2016)
          • Audi Q5 2.0 L4 (2010–2012)
          • Audi A4 2.0 L4 (2010–2012)
          • Audi A5 2.0 L4 (2010–2012)
          • Volkswagen Jetta 2.0 L4 (2010–2014)
          • Volkswagen CC 2.0 L4 (2010–2016)
          • Volkswagen Beetle 1.8 L4 (2015–2016)
          • Volkswagen Golf 2.0 L4 (2013–2014)
          • Volkswagen CC 3.6 V6 (2010–2016)
          • Volkswagen Beetle TDI 2.0 L4 (2013–2015)

          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 Fitâ„¢ - 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 Hitachi ALR0400-HU Voltage Regulator do?

          The Hitachi Voltage Regulator maintains the correct voltage levels in your vehicle's electrical system, ensuring that the battery is charged properly and that electrical components function correctly. It prevents voltage fluctuations that could damage sensitive electronics.

          How do I know if my Voltage Regulator needs replacement?

          Common signs that the voltage regulator may need replacement include dimming headlights, electrical accessories malfunctioning, a dead battery, or warning lights related to the charging system appearing on the dashboard.

          Can I install the Hitachi ALR0400-HU myself?

          Yes, the Hitachi ALR0400-HU can be installed by DIYers with basic automotive knowledge. However, ensure to follow proper safety precautions and consult your vehicle’s service manual for specific installation instructions.

          What are the symptoms of a faulty Voltage Regulator?

          Symptoms of a faulty voltage regulator include erratic electrical performance, frequent battery dead issues, and dashboard warning lights. If you experience these issues, it is advisable to inspect the regulator and surrounding components for potential failure.

          Why should I choose Hitachi for my Voltage Regulator needs?

          Hitachi is renowned for its quality and reliability in automotive parts. Order Hitachi ALR0400-HU 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
              3998129
            • Weight
              0.28 lbs
            • Dimensions (L x W x H)
              4.88 x 3.66 x 2.11 in
            • Barcode
              00840151005239
            • Manufacturer Part #
              ALR0400-HU
          • Brand
            Hitachi
          • Manufacturer
            Hitachi
          • MPN
            ALR0400-HU
          • Part Type
            Voltage Regulator
          • OE Part Numbers
            07K903803, 06E903803F
          • Cross Reference Numbers
            ALR0400HU, 130400
          • Features
            California Proposition 65 Image : prop65_cancer.jpg
            California Proposition 65 Required : Y
            California Proposition 65 Text : WARNING Cancer. ADVERTENCIA Cáncer. AVERTISSEMENT Cancer. www.P65Warnings.ca.gov
            Manufacturer : Hitachi
          • Fitment
            • Fitment Type
              Vehicle Specific
          YearMakeModelSubmodelNotes
          2008AudiA5 QuattroBase (3.2 V6 GAS)Engine: CALA, Valves: 24, Notes: Availability: Available to Order, Amperage Rating: 140
          2009AudiS4Cabriolet (4.2 V8 GAS)Engine: BHF, Valves: 40, Notes: Availability: Available to Order, Amperage Rating: 140
          2009AudiA4Base (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2009AudiA4Cabriolet (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2009AudiA4 QuattroCabriolet (3.2 V6 GAS)Engine: BKH, Valves: 24, Notes: Availability: Available to Order, Amperage Rating: 140
          2009AudiA4 QuattroBase (3.2 V6 GAS)Engine: CALA, Valves: 24, Notes: Availability: Available to Order, Amperage Rating: 140
          2009AudiA4 QuattroAvant (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2009AudiA4 QuattroBase (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2009AudiA4 QuattroCabriolet (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2009AudiA5 QuattroBase (3.2 V6 GAS)Engine: CALA, Valves: 24, Notes: Availability: Available to Order, Amperage Rating: 140
          2009AudiQ5Prestige (3.2 V6 GAS)Engine: CALB, Valves: 24, Notes: Availability: Available to Order, Amperage Rating: 140
          2009AudiQ5Premium (3.2 V6 GAS)Engine: CALB, Valves: 24, Notes: Availability: Available to Order, Amperage Rating: 140
          2009AudiQ5Premium Plus (3.2 V6 GAS)Engine: CALB, Valves: 24, Notes: Availability: Available to Order, Amperage Rating: 140
          2010AudiA4Base (2.0 L4 GAS)Engine: CAEB, Valves: 16, Notes: Availability: Available to Order, Amperage Rating: 140
          2010AudiA4 QuattroBase (2.0 L4 GAS)Engine: CAEB, Valves: 16, Notes: Availability: Available to Order, Amperage Rating: 140
          2010AudiA4 QuattroAvant (2.0 L4 GAS)Engine: CAEB, Valves: 16, Notes: Availability: Available to Order, Amperage Rating: 140
          2010AudiA5 QuattroBase (3.2 V6 GAS)Engine: CALA, Valves: 24, Notes: Availability: Available to Order, Amperage Rating: 140
          2010AudiA5 QuattroBase (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2010AudiA5 QuattroCabriolet (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2010AudiQ5Prestige (3.2 V6 GAS)Engine: CALB, Valves: 24, Notes: Availability: Available to Order, Amperage Rating: 140
          2010AudiQ5Premium (3.2 V6 GAS)Engine: CALB, Valves: 24, Notes: Availability: Available to Order, Amperage Rating: 140
          2010AudiQ5Premium Plus (3.2 V6 GAS)Engine: CALB, Valves: 24, Notes: Availability: Available to Order, Amperage Rating: 140
          2010AudiS4Base (3.0 V6 GAS)Engine: CCBA, Valves: 24, Notes: Availability: Available to Order, Amperage Rating: 140
          2010AudiS5Cabriolet (3.0 V6 GAS)Notes: Availability: Available to Order, Amperage Rating: 140, With Bosch Alternator
          2010AudiA5Cabriolet (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2010VolkswagenGTIBase (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140, With Bosch Alternator
          2010VolkswagenGolfBase (2.5 L5 GAS)Notes: Availability: Available to Order, Amperage Rating: 140, With Bosch Alternator
          2010VolkswagenGolfTDI (2.0 L4 DIESEL)Notes: Availability: Available to Order, Amperage Rating: 140, With Bosch Alternator
          2010VolkswagenCCVR6 (3.6 V6 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2010VolkswagenCCVR6 4Motion (3.6 V6 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2010VolkswagenCCVR6 Sport (3.6 V6 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2010VolkswagenCCLuxury (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2010VolkswagenCCSport (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2011AudiA4 QuattroBase (2.0 L4 GAS)Engine: CAEB, Valves: 16, Notes: Availability: Available to Order, Amperage Rating: 140
          2011AudiA4 QuattroAvant (2.0 L4 GAS)Engine: CAEB, Valves: 16, Notes: Availability: Available to Order, Amperage Rating: 140
          2011AudiA5Cabriolet (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2011AudiA5 QuattroBase (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2011AudiA5 QuattroCabriolet (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2011AudiQ5Prestige (3.2 V6 GAS)Engine: CALB, Valves: 24, Notes: Availability: Available to Order, Amperage Rating: 140
          2011AudiQ5Premium Plus (3.2 V6 GAS)Engine: CALB, Valves: 24, Notes: Availability: Available to Order, Amperage Rating: 140
          2011AudiQ5Premium (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2011AudiQ5Premium Plus (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2011AudiS4Base (3.0 V6 GAS)Engine: CCBA, Valves: 24, Notes: Availability: Available to Order, Amperage Rating: 140
          2011AudiS5Cabriolet (3.0 V6 GAS)Notes: Availability: Available to Order, Amperage Rating: 140, With Bosch Alternator
          2011AudiTT QuattroBase (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140, With Bosch Alternator
          2011AudiA4Base (2.0 L4 GAS)Engine: CAEB, Valves: 16, Notes: Availability: Available to Order, Amperage Rating: 140
          2011VolkswagenJettaS (2.5 L5 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2011VolkswagenJettaSE (2.5 L5 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2011VolkswagenJettaSEL (2.5 L5 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2011VolkswagenJettaBase (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2011VolkswagenJettaS (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2011VolkswagenJettaTDI (2.0 L4 DIESEL)Notes: Availability: Available to Order, Amperage Rating: 140
          2011VolkswagenEosKomfort (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140, With Bosch Alternator
          2011VolkswagenEosLux (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140, With Bosch Alternator
          2011VolkswagenCCVR6 4Motion (3.6 V6 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2011VolkswagenCCLuxury (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2011VolkswagenCCR-Line (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2011VolkswagenCCSport (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2011VolkswagenGolfBase (2.5 L5 GAS)Notes: Availability: Available to Order, Amperage Rating: 140, With Bosch Alternator
          2011VolkswagenGolfTDI (2.0 L4 DIESEL)Notes: Availability: Available to Order, Amperage Rating: 140, With Bosch Alternator
          2011VolkswagenGTIBase (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140, With Bosch Alternator
          2012VolkswagenEosExecutive (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140, With Bosch Alternator
          2012VolkswagenEosKomfort (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140, With Bosch Alternator
          2012VolkswagenEosLux (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140, With Bosch Alternator
          2012VolkswagenCCExecutive (3.6 V6 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2012VolkswagenCCLux (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2012VolkswagenCCLux Limited (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2012VolkswagenCCLux Plus (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2012VolkswagenCCR-Line (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2012VolkswagenCCSport (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2012VolkswagenGolfBase (2.5 L5 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2012VolkswagenGolfTDI (2.0 L4 DIESEL)Notes: Availability: Available to Order, Amperage Rating: 140
          2012VolkswagenGTIBase (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2012VolkswagenBeetleBase (2.5 L5 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2012VolkswagenBeetleTurbo (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2012VolkswagenJettaS (2.5 L5 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2012VolkswagenJettaSE (2.5 L5 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2012VolkswagenJettaSEL (2.5 L5 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2012VolkswagenJettaGLI (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2012VolkswagenJettaS (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2012VolkswagenJettaTDI (2.0 L4 DIESEL)Notes: Availability: Available to Order, Amperage Rating: 140
          2012VolkswagenJettaTDI Premium (2.0 L4 DIESEL)Notes: Availability: Available to Order, Amperage Rating: 140
          2012VolkswagenTiguanS (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140, With Bosch Alternator
          2012VolkswagenTiguanSE (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140, With Bosch Alternator
          2012VolkswagenTiguanSEL (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140, With Bosch Alternator
          2012AudiQ5Prestige (3.2 V6 GAS)Engine: CALB, Valves: 24, Notes: Availability: Available to Order, Amperage Rating: 140
          2012AudiQ5Premium Plus (3.2 V6 GAS)Engine: CALB, Valves: 24, Notes: Availability: Available to Order, Amperage Rating: 140
          2012AudiQ5Premium (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2012AudiQ5Premium Plus (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2012AudiA4Base (2.0 L4 GAS)Engine: CAEB, Valves: 16, Notes: Availability: Available to Order, Amperage Rating: 140
          2012AudiA4 QuattroBase (2.0 L4 GAS)Engine: CAEB, Valves: 16, Notes: Availability: Available to Order, Amperage Rating: 140
          2012AudiA4 QuattroAvant (2.0 L4 GAS)Engine: CAEB, Valves: 16, Notes: Availability: Available to Order, Amperage Rating: 140
          2012AudiS4Base (3.0 V6 GAS)Engine: CCBA, Valves: 24, Notes: Availability: Available to Order, Amperage Rating: 140
          2012AudiS5Cabriolet (3.0 V6 GAS)Notes: Availability: Available to Order, Amperage Rating: 140, With Bosch Alternator
          2012AudiTT QuattroPrestige (2.0 L4 GAS)Engine: CETA, Valves: 16, Notes: Availability: Available to Order, Amperage Rating: 140
          2012AudiTT QuattroPremium Plus (2.0 L4 GAS)Engine: CETA, Valves: 16, Notes: Availability: Available to Order, Amperage Rating: 140
          2013VolkswagenCCLux (3.6 V6 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2013VolkswagenCCVR6 4Motion Executive (3.6 V6 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2013VolkswagenCCLux (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          2013VolkswagenCCR-Line (2.0 L4 GAS)Notes: Availability: Available to Order, Amperage Rating: 140
          There are more vehicles this part is compatible with. Check if it fits your vehicle.
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          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.

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