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If the check engine light comes on in your Mercedes Sprinter van, you should use an OBD II scan tool to retrieve the code from the ECU. An example of a common code is P0101, indicating that the voltage from the mass air flow sensor is not within the expected range. It's important to inspect the sensor for any visible damage or loose wires, as these issues can trigger the code. If you find that the sensor is damaged, it's recommended to replace it, which is a relatively simple task and should cost under $50.
In a Mercedes Sprinter, if you see Code P0101, it indicates that the mass air flow sensor (MAF) is providing power that is not within the normal range. The MAF sensor is placed in the engine's intake, right after the air filter, and it gauges the amount of air flowing into the engine through the throttle valve.