P0102
Mass or Volume Air Flow Sensor A Circuit Low
Fuel & air metering
Generic OBD-II
High
What it means
P0102 means the mass air flow (MAF) sensor is sending a lower-than-expected signal to the engine computer. With a bad airflow reading the ECM can't meter fuel correctly, so the engine may idle roughly, hesitate, lose power and use more fuel. The car will usually still run, but drivability suffers until it's fixed.
High
Can I keep driving? Usually driveable but the engine runs rough and down on power; prolonged lean/rich running strains it, so fix it soon.
Common symptoms
What you'll notice
- Check-engine light on
- Rough or unstable idle
- Hesitation and reduced power on acceleration
- Increased fuel consumption
Common causes
Most likely first
- Dirty or contaminated MAF sensing elementLikely
- Unmetered air leak between the MAF and throttle bodyCommon
- Loose or corroded MAF connectorCommon
- Damaged wiring in the sensor circuitLess often
- Failed MAF sensor (ECM failure is rare)Less often
How to diagnose & fix
Work through it in order
- Inspect and clean the MAF element with dedicated MAF cleaner — never touch it by hand.
- Check the intake ducting, clamps and boot for cracks or air leaks after the MAF.
- Inspect the MAF connector and wiring for corrosion, looseness or damage.
- Compare live airflow readings to a known-good value; replace the MAF if it still reads low.
- Only consider the ECM after sensor, wiring and intake checks pass.
FAQ
Quick answers
Is it safe to drive with P0102?+
Short-term yes, but the engine will run rough and lose power. Because the ECM is metering fuel from a bad airflow signal, don't put it off — extended lean or rich running can foul plugs and stress the catalytic converter.
Can I just clear P0102?+
It will return within a drive cycle or two unless the MAF, its wiring or an intake leak is actually fixed.
Related codes
Often seen with P0102
Read & clear P0102 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX