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Mercedes Common ECU Faults

Mercedes A Class ECU & Air Mass/Flow Meter

This ECU is a very common fault for the Mercedes A Class, it causes the engine management light to come on and fault code for the Air Mass/Flow Meter to be stored in the ECU’s memory. This fault can cause the engine to run rough and idle poorly, click here for further details.

Mercedes Sprinter ABS Pump (Return Pump Fault)

Very common fault causes the ABS lights to illuminate with fault code "C1401 - RETURN PUMP FAULT"

Mercedes S / E Class Dash/Dashboard Instrument Cluster

Complete loss of back lighting. We are currently rebuilding customers own units with a Lifetime Warranty*, this is a very common failure for the Mercedes S & E Class instrument cluster

Mercedes A-Class Automatic gearbox ECU

this is a common problem causing the “F” light to appear on the dash and the gears feel as though they are banging in to place...

Mercedes CLK320 Roof Contoller

Common failure for the CLK320, causes the electric roof fuse to blow due to excessive current draw. Part No’s. A2088000230 / A2088001748

Mercedes E220, E270 & E320 Turbo Actuator Fault

Causes the engine to loose power intermittently, but rectifies when ignition is turned off. The fault always becomes more permanent with time.

Mercedes Sprinter CDI Turbo Actuator fault

Common problem for all Sprinters built after 2007, causes the engine to loose power intermittently.

Mercedes misfiring ECU fault

This is a very common fault with the VDO ECU (engine ECU) fitted to the E320 and various other models. The problem is with the coil drivers inside the ECU failing thus causing the engine to misfire.

Mercedes 1992 onwards with distributorless ignition systems made by Bosch, Siemens & VDO

This is caused a faulty engine ECU that loses its driver signal to part of the ignition coil, this is a very common problem at the moment and affects all models. It is assential that the ignition coils are replaced as the new or repaired engine control unit will blow again if the old coils are left in place.

The VDO unit is a larger metal unit with two multi plugs located at the top

The Bosch & Siemens units are small black & plastic.