OBD-II · Engine and powertrain (P)
P0104
Mass air flow intermittent
What it means
The MAF signal drops out or fluctuates unexpectedly.
Symptoms
- occasional hesitation, surging or stalling
- engine warning light that comes and goes
Likely causes, most likely first
| No. | Cause |
|---|---|
| 01 | loose connector |
| 02 | broken wire near plug |
| 03 | corroded connector terminals |
| 04 | intermittent internal sensor fault |
| 05 | water ingress into connector |
What to check, step by step
- 01Wiggle-test the MAF connector and wiring while watching live data
- 02Check the connector for corrosion, water or loose terminals
- 03Check the supply and ground for intermittent drops
- 04Replace the sensor if the wiring is sound