OEM Part Numbers

Technical Specifications

Product Description

This new original BorgWarner Haldex pump with part number 02D525557 is designed for 1st generation Haldex AWD systems used across a wide range of VAG vehicles. The pump creates the hydraulic pressure required to activate the AWD clutch pack and engage rear-wheel drive when traction is needed.

What This Pump Does

• Builds hydraulic pressure for Haldex clutch engagement
• Restores rear-wheel drive activation in AWD conditions
• Supports correct operation of the AWD coupling and factory electronics
• Helps eliminate traction loss caused by a weak, blocked, or failed pump

Vehicle Compatibility

The 02D525557 pump is suitable for selected Volkswagen Group vehicles equipped with 1st generation Haldex AWD. Always verify the exact OEM part number before ordering.

Suitable for the Following Vehicle Models

Common Fault Codes & Symptoms

A faulty Gen 1 Haldex pump can cause AWD engagement problems, low hydraulic pressure and traction issues. Common pump-related symptoms and diagnostic signs include:

Installation & Service Notes

Recommended Steps

• Verify the exact OEM number on the original Haldex pump
• Replace the hydraulic pump according to the correct repair procedure
• Use fresh original 1st generation Haldex oil G052175A1
• Replace the filter 02D525558A during pump replacement
• Check the AWD system for stored faults after installation
• Verify proper rear axle engagement after service

Why Haldex Pumps Fail

1. Internal Pump Wear

Gen 1 pumps can wear internally and lose the ability to create the oil pressure needed for clutch engagement.

2. Contaminated or Old Haldex Oil

Old oil increases wear inside the pump and reduces the performance of the AWD coupling.

3. Blocked Filter Gauze

A restricted filter reduces oil flow and can overload the pump, causing weak AWD operation or pump failure.

4. Ignored AWD Fault Symptoms

Continuing to drive with AWD warning symptoms can lead to worsening traction performance and additional drivetrain wear.

Quality Assurance & Warranty

12-Month Warranty: This new BorgWarner Haldex pump is supplied with a 12-month functionality warranty under normal operating conditions.

Warranty Coverage Includes:

• Pump motor malfunction
• Internal functional failure of the replacement unit
• Operational defects under normal use

Warranty Exclusions:

• Incorrect installation
• Failure to replace contaminated oil or blocked filter
• External wiring or control module faults
• Physical damage or misuse

Questions or Need Help?

Our technical team is ready to assist with compatibility checks, installation guidance and product selection.

Important Purchase Information

• Please verify this part fits your specific vehicle before placing an order
• Photos are for illustrative purposes only
• Worldwide shipping is available
• If your country is not listed at checkout, contact us and the order can be processed manually
• We recommend changing the Haldex oil and filter when replacing the pump
• Please check if this product fits your car before purchase