In other cases, there may performance problems, such as a lack of power on acceleration, "coughing," misfiring, and/or backfiringīlack smoke from the tail pipe and poor fuel mileage In some cases, there may be no adverse conditions noticed by the driver Code P0101 is set when this sensor's output becomes irrational and/or out of range. This is important information the Engine Control Module (ECM) uses to calculate the proper amount of fuel for combustion and the amount of ignition timing advance. The Mass Airflow Sensor (MAF) measures the amount of air entering the engine. ![]() OBD-II Code P0101 is defined as a Mass Air Flow Sensor Circuit/Performance Malfunction
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