MotorBitP0102: Mass or Volume Air Flow Circuit Low Input
MAF signal is too low. Unplugged sensor or torn intake hose after the MAF are classic.
Educational OBD2 information. Confirm on your vehicle with a scan tool. MotorBit can read this code, freeze frame, and live data over an ELM327 adapter.
What P0102 means
The PCM sees airflow lower than a minimum threshold.
Why the check engine light comes on
The engine may run in a backup fuel map. The MIL warns that metering is invalid.
Common causes
- Disconnected MAF
- Open circuit
- Severe intake leak
- Failed sensor
Typical symptoms
- Hard start
- Stalling
- No power
What to do next
- Check the connector first.
- Inspect the tube between MAF and throttle body.
- Watch MAF PID — it should not sit at zero while the engine runs.
How MotorBit helps
Open MotorBit, connect your ELM327, and read P0102 with freeze frame (RPM, load, temperature, speed at the moment the fault set). Then watch live PIDs and fuel trims instead of replacing parts by guesswork. When the repair is verified, clear the code and re-check monitors.
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FAQ
Is P0102 serious?
Severity is listed as medium on this page. Misfire, crank/cam, and communication codes deserve faster attention than a tiny EVAP leak.
Will disconnecting the battery clear P0102?
It may hide the lamp temporarily, but the fault usually returns and you lose freeze-frame evidence. Scan first, then clear after the repair.
Can MotorBit clear P0102?
Yes, after you understand the cause. Clearing without a repair is how the light comes back on the next drive cycle.