OEM Part Numbers & Cross-References

Technical Specifications

Product Description

This used original Haldex control unit with part number 0AY907554E is designed for 4th generation Haldex AWD systems used in selected Volkswagen Group vehicles. It is a Continental rear differential controller responsible for managing AWD engagement, communication with drivetrain electronics and stable operation of the Haldex system.

What This Control Unit Does

• Controls rear differential clutch engagement in Gen 4 Haldex systems
• Helps restore 4x4 / AWD operation when the original module has failed
• Supports communication with ABS, ESP and AWD electronics
• Can help resolve no-communication faults and traction-related warnings
• Offers a cost-effective replacement for a damaged original ECU

The unit is suitable for vehicles showing AWD malfunction, rear-wheel drive not engaging, no communication with the Haldex module, or warning lights related to ESP / ABS. This product is supplied as a used OEM part that has been checked for correct operation before dispatch.

Vehicle Compatibility

This Haldex ECU is suitable for selected VAG vehicles equipped with a 4th generation Haldex AWD system. Always verify the exact part number on your original unit before ordering.

Volkswagen

Audi

Škoda

SEAT

Common Diagnostic Fault Codes & Symptoms

Problems with a defective Haldex ECU can commonly trigger the following symptoms or fault indications:

Installation & Recommended Service

Installation Steps

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

Recommended During Replacement

• Replace the Haldex valve N373 if there are valve-related faults
• Replace Haldex oil during service
• Inspect wiring, pump condition and connector pins for damage or corrosion

Quality Assurance & Warranty

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

Warranty Includes

• Verified working module functionality before shipping
• Basic compatibility guidance before purchase
• Online support if coding assistance is needed after installation

Warranty Excludes

• Incorrect part ordering without number verification
• Damage caused by wiring faults, moisture ingress or poor installation
• Vehicle-side pump, valve or electrical faults unrelated to the ECU itself

Important Purchase Information

• Please verify the exact module number printed on your original unit before ordering.
• Worldwide shipping is available. If your country is not shown at checkout, contact us directly.
• Replacing the Haldex valve N373 and servicing the Haldex oil is recommended when fitting a replacement ECU.
• Online support is available if coding assistance is required after installation.