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How to Reset the Engine Control Unit of the Mercedes C-Class

Model: Mercedes Classe C W203 - Years: 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
Part: Warning light – error code

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Video tutorial

Below are the steps to reset the engine control unit of the Mercedes C-Class. Before resetting via computer, try disconnecting the power from the control unit by removing both battery terminals.

If that does not work, connect the diagnostic software to the OBD port, consulting a specialized shop if necessary. Then select the make, model, and engine type, following the guided procedure to reset the engine control unit.

Finally, check the operation of the vehicle.


Updated on 1 October 2026 by ScegliAuto


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by ScegliAuto

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