P0102moderate severityPowertrain
Mass Air Flow (MAF) Circuit Low Input
on 2003 Mazda Protege 1.6L I4 · FWD
What this code means
The MAF sensor signal voltage is lower than the minimum expected value.
Symptoms
- Check Engine Light
- Loss of power
- Rich fuel condition
- Black smoke
Common causes
- Faulty MAF sensor
- Short in signal wire
- Disconnected sensor
- Contaminated sensor element
Diagnostic steps
- Check MAF sensor connector
- Test signal voltage
- Inspect wiring for shorts to ground
- Test sensor output
Repair notes
Replace MAF sensor or repair wiring.
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