This includes alternators, ignition wires, etc. The wiring or MAF sensor may be too close to higher voltage consuming components. This causes conflicts in the engine management system leading to poor performance and erratic operation. The MAF sensor is not operating within the performance range programmed into the ECU related to the data sampling rate. ![]() This provides input to the Engine Control Unit (ECU) giving outputs that are beyond the programming for the engine management. The most common source of the problem is the sensor range of the MAF sensor being outside of the normal operating range. ![]() P0101 is the general code for a problem with the Mass Airflow Sensor (MAS) operating range and/or an engine performance issue. ![]() The P0101 code can often be associated with a P0100, P0102, P0103 and P0104 codes.Mass Airflow (MAF) Circuit Operating Range or Performance Problem
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