Some systems will perform a self-test when the ignition is switched on. Some warning and indicator lamps may briefly light up or flash. This behavior is non-critical. These warning and indicator lamps indicate a malfunction only if they light up or flash after the engine has been started or during a journey. Instrument Display (standard) Widescreen Cockpit Instrument Display Depending on the display setting, the positions of the indicator lamps on the Instrument Display may differ from the example shown. Warning and indicator lamps:
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Mercedes-Benz C-Class Owners Manual > Warning and indicator lamps: Engine
Warning/indicator lamp Possible causes/consequences and ► Solutions Engine diagnosis warning lamp The yellow Check Engine warning lamp is lit while the engine is running. A malfunction has occurred in the engine, the exhaust system or the fuel system. The emission limit values may be exceeded and ...