Applicable Systems
OBD-II
Symptoms
MAF sensor signal out of range; engine may run rich or lean; poor fuel economy.
Possible Causes
- MAF sensor element contaminated
- MAF sensor wiring open/short
- Air intake leak after MAF sensor
Troubleshooting Steps
- Step 1: Check MAF sensor signal voltage at idle
Signal within 1.0-1.5V at idle - Step 2: Inspect MAF sensor element for contamination
Element clean, no debris - Step 3: Check wiring connector for corrosion
Connector clean and tight - Step 4: Check for air intake leaks after MAF
No vacuum leaks found - Step 5: Replace MAF sensor if signal out of range
New sensor signal within spec
How to Reset
Clear DTC with OBD-II scanner after repair; verify with drive cycle.
Common Replacement Parts
- MAF Sensor (OEM spec)
Frequently Asked Questions
- Q: Can I clean MAF sensor instead of replacing?
Yes, use MAF sensor cleaner spray (NOT carb cleaner). If signal improves, replacement may not be needed. Replace if element is damaged.
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Source: SAE J2012 standard DTC list + OBD-II portal
Category: OBD-II
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