P0103
MAF Sensor Circuit High Input
medium
i Description
The Mass Air Flow sensor is reporting a higher-than-expected voltage or frequency. The ECU sees more air being reported than the engine should be consuming under current conditions.
? Common Causes
- Short circuit in MAF sensor wiring
- Faulty MAF sensor
- Water or contamination on sensor element
- Aftermarket intake without proper MAF calibration
- ECU fault (rare)
! Symptoms
- Check engine light
- Engine running lean
- Hesitation and surging
- Poor fuel economy
- Possible lean misfire
# Diagnostic Steps
- Check MAF sensor wiring for short circuits
- Inspect MAF sensor element for contamination
- Test MAF sensor voltage under various conditions
- Verify aftermarket intake is compatible
- Replace MAF sensor if readings are out of spec
⚙ Typical Fix
Repair short circuit in wiring or replace the MAF sensor.
Parts Needed
MAF sensor, Wiring repair supplies
Estimated Cost
$50-$350
↔ Related Codes
Q Frequently Asked Questions
Driving is possible but the engine may run lean, which can cause overheating and misfire. Address this promptly to avoid engine damage.
Wiring repair: $50-$150. New MAF sensor: $80-$300.
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