OEM Part Numbers & Cross-References

Technical Specifications

Product Description

This complete set includes a refurbished OEM Haldex control unit with part number 0AY907554E and a refurbished N373 valve for 4th generation Haldex AWD systems used in Volkswagen Group vehicles. Both components have been professionally restored and tested to support reliable rear differential engagement and stable AWD communication.

What This Set Does

• Restores rear-wheel-drive engagement in Gen 4 Haldex systems
• Helps resolve repeated N373 valve-related faults
• Supports correct communication with ABS / ESP and AWD electronics
• Provides a more complete repair solution than replacing the ECU alone
• Helps reduce repeat issues caused by a worn or faulty control valve

This set is intended for vehicles showing no communication faults, N373 valve errors, ESP / ABS warning lights or loss of rear-wheel-drive function. Replacing both the ECU and valve together can improve repair reliability when both components may be affected.

Vehicle Compatibility

This refurbished Haldex ECU and valve set is suitable for selected VAG vehicles using a 4th generation Haldex AWD system. Always verify the exact part number on your original module before ordering.

Volkswagen

Audi

Škoda

SEAT

Common Diagnostic Fault Codes & Symptoms

Problems with the Haldex control unit or N373 valve commonly trigger the following symptoms or diagnostic issues:

Installation & Recommended Service

Installation Steps

• Verify the exact OEM part number on the original control unit
• Disconnect the battery and safely access the Haldex module on the rear differential
• Remove the old ECU and inspect the connector area for moisture or corrosion
• Replace the N373 valve during the same service procedure
• Install the replacement ECU carefully and reconnect all plugs securely
• Clear stored fault codes and confirm AWD module communication with suitable diagnostics
• Carry out coding or adaptation if required by the vehicle
• Perform a test drive and confirm correct AWD engagement

Recommended at Time of Replacement

• Check Haldex oil condition and service if necessary
• Inspect the rear wiring connector and harness for corrosion or damage
• Clear all stored AWD, ABS and ESP related faults after installation

Quality Assurance & Warranty

12-Month Warranty: This refurbished Haldex control unit and valve set is supplied with a 12-month warranty and is tested before dispatch.

Warranty Includes

• Verified functionality of the refurbished control unit and valve set
• Bench-tested operation before shipping
• Basic pre-purchase compatibility guidance

Warranty Does Not Cover

• Incorrect part ordering without part-number verification
• Damage caused by installation errors or external vehicle faults
• Related pump, wiring or drivetrain defects outside the supplied set

Important Purchase Information

• Please verify the exact part number before ordering
• Shipping worldwide is available
• If your country is not available at checkout, contact us directly for manual processing