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To diagnose the check engine light on a 2001 Mercedes-Benz C320, start by using an OBD-II scanner to retrieve any diagnostic trouble codes (DTCs). Common issues for this model may include problems with the mass airflow sensor, oxygen sensors, or ignition components. After identifying the codes, inspect the related components and wiring for any signs of wear or damage. Once repairs are made, clear the codes and monitor the light to ensure it doesn’t reappear.

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