Mass or Volume Air Flow Circuit Low Input
The mass air flow (MAF) sensor measures the air going into the engine; the engine computer uses it to work out how much fuel to inject. This code means the electrical signal arriving is lower than possible, as if the sensor wasn't measuring or the circuit was broken.
What the car has detected
The voltage or frequency of the MAF signal is below the minimum a working sensor can produce.
You can drive carefully: without that reading the engine computer uses back-up values and the engine may lose power. Get it checked soon.
Symptoms
- Engine warning light on
- Loss of power or limp mode
- Hesitation or stalling
- Hard starting
- Higher fuel consumption
Possible causes
- Loose, corroded or damaged connector pins
- Broken or damaged wire between the MAF sensor and the engine computer
- Missing power supply or earth to the sensor
- Failed MAF sensor
Checks for the garage
- Check the MAF connector and wiring
- Measure the supply with the ignition on (roughly battery voltage) and the earth
- Measure the signal at idle and when revving with a multimeter or the diagnostic tool
- Replace the MAF sensor only if wiring, supply and earth are fine
Next step
Check that the MAF connector is properly fitted and free of corrosion, and have the wiring and sensor checked.
Go to a garage if the connector is fine and the code persists, or if the car goes into limp mode. Electrical measurements need a multimeter and diagnostics.