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How to Reset the Check Engine Light on a 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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The check engine light on the instrument cluster of the Mercedes C-Class indicates a generic malfunction in the engine's fuel injection system: therefore, there is no single procedure to reset the light. You need to connect a diagnostic tool to the vehicle's OBD port, located on the lower left side of the steering column: this way, you can check which errors are stored in the ECU and reset them correctly.

At this point, you can disconnect the diagnostic tool and start the engine, confirming that the light has been reset.


Updated on 2 September 2026 by ScegliAuto


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How to Replace the Glow Plugs in the Fiat Ducato 2.3 Multijet?

Glow plugs, as the name suggests, raise the temperature of the engine in diesel vehicles to allow for easier starting. The manufacturer, in this case, Fiat for the Ducato 2.3 Multijet, specifies how often they should be replaced, and a warning light will illuminate when it's time. This work is carried out under the bonnet. First, remove the upper engine cover, then lift the coil and, using a socket wrench of the appropriate size, unscrew the glow plug to remove it from the base, followed by installing the new one.

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