Mercedes-Benz W221 ABS Pump A2214311412 - Used Original Parts

Quick Answer

A used original ABS pump is the right fix for a W221 S-Class when diagnosis confirms the hydraulic unit itself has failed, for example a pump motor that no longer runs or a valve block that throws ABS/ESP faults after wheel speed sensors and wiring have been cleared. A tested Genuine unit suits Malaysia because the new part is a high-cost dealer item on a car that is now well past its warranty years. A used unit from a donor car gives the same factory hydraulic specification and fitment at a far more sensible repair cost.

Diagnosis and Common Symptoms

The ABS/ESP hydraulic unit on the W221 combines the pump motor, the solenoid valve block and the control electronics. Ageing, heat cycling and Malaysian humidity attack the connector pins, the motor brushes and the valve coils. Symptoms usually appear in this order:

• ABS, ESP and BAS warning lights on together, often with the message "ESP inoperative" or "ABS Visit workshop" in the instrument cluster.
• A red brake warning on some faults, with the car then falling back to conventional braking without ABS assistance.
• A hard or inconsistent brake pedal. The pedal may drop slowly or feel different from normal.
• A pump that runs far too long, buzzes at idle, or never starts when the self-test runs at about 8 km/h after startup.
• Failure of dependent systems. Adaptive Brake Hold, Distronic and PRE-SAFE functions may drop out because they rely on the ABS/ESP unit.
• Intermittent faults that clear after a restart and return when the car is hot or after rain.

In Xentry or a similar Mercedes-capable scanner, look for stored faults on the ESP/ABS control unit relating to the hydraulic unit, pump motor, valve relay, or internal control unit failure. Do not condemn the unit on a wheel speed fault alone. Wheel speed sensors, tone rings, the battery, and the voltage supply and ground to the unit must be tested first. A weak battery or corroded earth on a W221 can produce false ABS/ESP faults. Only replace the unit once the faults persist after these checks and the pump or valve tests fail in the actuation routine.

Introduction

This is a Genuine Used ABS pump removed from a Mercedes-Benz W221 S-Class and tested before listing. We do not sell untested units, so you receive a part that has been checked for connector condition, housing damage and basic function. Genuine used hardware keeps the factory hydraulic layout and the original control electronics. This avoids the fitment and reliability problems often seen with unbranded rebuilt units.

Product Details

• Brand: Mercedes-Benz
• Model Compatibility: W221 S-Class (2005–2013). Confirm by part number and VIN before ordering, since 4MATIC and equipment variants differ.
• Part Name: ABS Pump / ABS-ESP Hydraulic Unit, Part No. A2214311412
• Condition: Genuine Used (Tested Working)
• Notes: Brake fluid system must be bled after installation, ideally with Xentry/Star Diagnosis running the ABS pump bleeding routine so air is cleared from the valve block. Check the unit's variant coding and software against the car with Xentry after installation. Use new brake line seals where applicable and inspect the connector for corrosion. Clear all stored faults and road test, confirming ESP and ABS lights go out.