Applicable Systems
OBD-II
Symptoms
MAF sensor signal voltage above maximum expected; ECM sees more airflow than actual; may run lean.
Possible Causes
- MAF sensor signal wire short to +5V or +12V
- MAF sensor internal failure
- Aftermarket performance MAF with wrong calibration
Troubleshooting Steps
- Step 1: Check MAF signal voltage at key ON engine OFF
Voltage should be ~0.5V - Step 2: Check signal wire for short to +V
No short to +V supply - Step 3: Verify MAF is OEM or correct part number
Correct OEM part installed - Step 4: Replace MAF sensor if voltage high
New sensor voltage normal - Step 5: Clear code and verify on drive cycle
MAF reading normal
How to Reset
Clear with OBD-II scanner after repair.
Common Replacement Parts
- MAF Sensor (OEM spec)
Frequently Asked Questions
- Q: Can aftermarket MAF sensor cause this code?
Yes, aftermarket or re-calibrated MAF sensors may output voltage outside OEM range, triggering this code.
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Source: SAE J2012 standard DTC list + OBD-II portal
Category: OBD-II
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