P0100
Mass Air Flow (MAF) Circuit Malfunction
The MAF sensor circuit is reporting values outside the expected range.
The Mass Air Flow sensor measures the amount of air entering the engine. The ECM uses this data to calculate fuel injection timing and quantity. When this code sets, the ECM has detected that the MAF sensor signal is outside the normal operating range, which can cause poor fuel economy, rough idle, and hesitation during acceleration.
Symptoms
Common Causes
Dirty or contaminated MAF sensor
HIGHOil, dirt or debris on the sensing element reduces accuracy.
Faulty MAF sensor
MEDIUMInternal circuit failure in the sensor itself.
Air leak between MAF and throttle body
MEDIUMUnmetered air enters after the sensor, skewing readings.
Damaged wiring or connector
LOWCorroded pins or chafed wires interrupt the signal.
Step-by-Step Diagnosis
Inspect MAF sensor
easyRemove the MAF sensor and visually check for contamination or damage on the hot wire/film element.
Clean MAF sensor
easyUse dedicated MAF sensor cleaner spray. Do NOT touch the element. Let dry completely before reinstalling.
Check wiring and connector
mediumInspect the MAF connector for corrosion or bent pins. Check wiring harness for damage.
Check for vacuum leaks
mediumInspect all hoses and intake boots between the MAF sensor and throttle body for cracks or loose clamps.
Frequently Asked Questions
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