• Used haldex control unit 1.generation
  • Close-up photo of Gen1 Haldex module – compatible with Golf Mk4 R32 and Audi TT 8N
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Cars-Ecu

02D525554 / 02D900554 Haldex control unit 1. Generation Used

02D525554 / 02D900554 Haldex control unit 1. Generation Used

€299,90 EUR
€299,90 EUR
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Used OEM Haldex Control Unit 1st Generation – VAG AWD

OEM Numbers: 02D525554 / 02D900554 Series

Original Haldex control unit for first-generation VAG all-wheel-drive systems used in selected Volkswagen, Audi, Škoda and SEAT vehicles.

System Type Haldex AWD 1st Generation
Condition Used – Fully Tested & Functional
Manufacturer Original OEM
OEM Compatibility 02D525554 / 02D900554 Series
Application Rear Axle Differential Control Unit
Warranty 12 Months
Used & Verified Working Unit Tested original Haldex controller for 1st generation AWD systems, intended to restore rear-wheel-drive engagement, module communication and correct AWD operation in compatible VAG vehicles.

OEM Part Numbers & Cross-References

Compatible OEM Numbers:

02D525554  •  02D900554A  •  02D900554B  •  02D900554C  •  02D900554D  •  02D900554DV  •  02D900554DX  •  02D900554E

Always Verify Your Part Number Please compare the OEM number on your current Haldex control unit before ordering. Vehicle model alone is not always enough to guarantee compatibility.

Technical Specifications

System Type:
Haldex AWD 1st Generation
Component:
Rear Axle Differential Control Unit (ECU / AWD Module)
Manufacturer:
Original OEM
Compatible OEM Range:
02D525554 / 02D900554A / B / C / D / DV / DX / E
Application:
Selected Volkswagen Group vehicles with 1st generation Haldex AWD
Part Condition:
Used – Fully Tested & Functional

Product Description

This is a used original Haldex control unit designed for first-generation Haldex AWD systems used in various Volkswagen Group vehicles. The controller manages rear differential engagement and helps restore correct all-wheel-drive function when the original module has failed.

What This Control Unit Does

  • Controls rear axle engagement in first-generation Haldex AWD systems
  • Supports proper communication with the AWD module
  • Helps restore rear-wheel-drive function when the original controller fails
  • Supports stable AWD performance and traction operation
  • Provides a tested replacement for compatible VAG applications

Common failure symptoms include loss of rear-wheel drive, communication faults with the AWD system, or dashboard warning lights such as ESP / ABS. This tested unit offers a practical replacement for restoring AWD performance.

Coding / Installation Assistance Online support is available in case the module needs coding guidance after installation. If you are unsure about fitment or setup, contact us before ordering.

Vehicle Compatibility

This first-generation Haldex control unit is intended for selected VAG AWD vehicles using a matching OEM controller number.

Common Applications

  • Volkswagen Golf Mk4 R32
  • Audi TT 8N Quattro
  • Audi S3 8L
  • Skoda Octavia Mk1 4x4
  • Seat Leon 1M Cupra4
  • Selected Skoda, Volkswagen, Audi and SEAT AWD models using matching OEM numbers
Not Sure About Compatibility? Please check whether this module is suitable for your car. Send us your VIN number or a photo of the original module label and we will help verify fitment.

Common Faults & Symptoms

When the Haldex control unit fails, your 4x4 / AWD system may malfunction or stop working completely. Typical symptoms mentioned for this unit include:

  • No communication with the AWD module
  • Loss of rear-wheel drive / rear axle not engaging
  • ESP / ABS warning lights on the dashboard
  • Intermittent or non-functioning AWD operation

Installation & Recommended Service

Installation Notes

  • Verify that the OEM number on the replacement module matches your original controller
  • Inspect the connector and surrounding wiring before installation
  • Install the module carefully on the rear differential system
  • Clear stored faults and confirm correct AWD communication after fitting
  • Use diagnostics if coding or adaptation is required for your vehicle

Recommended Checks

  • Inspect the Haldex wiring and connector condition
  • Check for stored AWD, ESP or ABS faults
  • Verify rear-wheel-drive engagement after installation
Online Technical Support Included If you have any questions about installation, coding guidance or compatibility, contact us at [email protected] or use the contact button below.

Quality Assurance & Warranty

12-Month Warranty: This used Haldex control unit is supplied with a 12-month warranty and is checked before dispatch.

Warranty Includes

  • Verified basic functionality before shipping
  • Pre-purchase compatibility guidance
  • Support in case coding guidance is needed

Warranty Does Not Cover

  • Incorrect ordering without OEM-number verification
  • Vehicle-side wiring, ABS, ESP or drivetrain faults
  • Damage caused during improper installation

Questions or Need Help?

If you have any questions and need advice, please contact us and we will help you choose the correct Haldex solution for your vehicle.

Contact Us

Important Purchase Information

  • Please check whether this module is suitable for your car before ordering
  • Worldwide shipping is available
  • If you need advice, contact us by email or WhatsApp via the contact page

 

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