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P0102 code will be normally preceded by the Check Engine Light coming on the dashboard display.

MAF sensors must operate within specific ranges to send correct signals for the ECU to adjust correctly for proper engine operation and inputs from other sensors.

Many MAF units have screens and they can get clogged up easily, clean using a CRC 05110 spray cleaner. The MAF sensor can also be dirty or partially plugged with carbon causing a low reading. The wiring or MAF sensor may be too close to higher voltage consumption components, especially alternators, ignition wires, etc. The most obvious problem is restricted airflow from the air cleaner to the MAF sensor which can be a clogged air filter. The source of the problem is the sensor range voltage is lower than normal or required by the ECU to function properly. The MAF Sensor has low voltage output problems which may have several causes.

P0102 is the general code for a problem with the Mass Airflow (MAF) Sensor having a low voltage output to the Engine Control Unit (ECU). The code P0102 code is often associated with P0100, P0101, P0103 or P0104 trouble codes as they are closely related.Mass Airflow (MAF) Circuit Low Voltage Input