Mercedes C-CLASS 2.1-2.2 C220 CDI ECU (Engine Management) – Part No: A6461500091 / 0281012222
Common Faults:

• P2123 or P2124 is stored, throttle sensor / accelerator pedal encoder.
• P0606 Control unit-NA.
• P0603 Control unit-Internal fault.
• Engine does not start permanently or sometimes weather-dependent.
• Sporadic no communication with control unit possible, depending on the temperature.
• Other CAN bus participants reports communication problems with the ECU.
• Sensor error, one or more sensors report too high values.
• Various components are not activated, permanently or depending on the temperature.
• Other fault on request.

Part Numbers:

• Mercedes Part Number – A6461500091
• Bosch Part number – 0281012222