Note: Do not use a cloth or cotton swabs to clean the sensor. Put everything back together and start the engine.Spray at least 10 spurts of MAF cleaner onto the sensor and then let it air dry for an hour or until completely dry.Find the location of the MAF sensor in your C-Class, it will be somewhere between the air filter box and the throttle body.However, caution is advised here, as the sensor parts are very sensitive to touch. Cleaning dirty MAF sensor in Mercedes-Benz C-ClassĬleaning the mass air flow sensor can help the sensor measure the correct values again, but only if the erroneous readings are caused by dirt accumulation.
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However, this should be best left to trained professional mechanics, as it requires reading and interpreting the measured values from the MAF sensor. But this should only be done after an extensive analysis as the MAF sensor may not be responsible for the symptoms of poor acceleration in your C-Class.Ī more accurate diagnosis can be performed by analyzing the MAF sensor Parameter Identification Data (PID) information on a scan tool. In case of doubt, the sensor may have to be replaced. However, it can happen that there are no error codes.
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If you see P0100, P0101, P0102, P0103 or P0104 code in the OBD2 scanner, it indicates a problem with the mass air flow sensor.
Reading out the fault codes using a diagnostic device is relatively reliable.
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How to check if the MAF sensor is bad in Mercedes-Benz C-Class? This can especially happen in older vehicles or in case of rodent damage. In rare cases, it is possible that the fault codes or the symptoms you’re seeing in your C-Class are not due to a bad MAF sensor, but because of broken electrical wires or a bad connector. In rare cases, the MAF sensor can also be damaged by oil vapors flowing back out of the crankcase ventilation after the engine has been switched off.
When driving fast in heavy rain, water can occasionally pass through the air filter and can damage or contaminate the MAF sensor, which can severely impair its functionality. There is no fixed timeline for when MAF sensors fail, sometimes they can last the lifetime of the vehicle, other times than can fail even before the warranty expires. With a noticeable loss of performance and high mileage, a defective MAF sensor should definitely be considered. As the mileage increases on your C-Class, it can happen that increasingly inaccurate values are sent to the engine control unit. The mass air flow sensor is a wearing part. And over time when enough dust accumulates, the sensor starts to give erroneous readings. When the vehicle is running, dirt and other airborne particles that escape from the air filter can settle on the sensor. Air filters are effective at cleaning the air to a certain extent. The most common cause of a malfunctioning MAF sensor in Mercedes-Benz C-Class is dirt and grime accumulation on the sensor. What causes MAF sensor to fail in C-Class? Dirt accumulation This can cause the engine warning light to illuminate in the instrument cluster and the fault can be read out by a diagnostic device. The engine runs too “lean” or too “rich”. The optimal amount of fuel can no longer be calculated which results in either too little or too much fuel injected into the combustion chambers. If the MAF sensor is defective or dirty, it does not send correct measured values to the control unit of C-Class. What happens when MAF sensor malfunctions in Mercedes-Benz C-Class? It is not only important for power delivery in your C-Class, but also for the lowest possible pollutant emissions. The mass air flow sensor is part of the engine’s intake system and is located between the air filter and the throttle body.
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