Code
P1101
Intake / MAF
Mass airflow sensor out of self-test range
The MAF sensor failed its self-test range, often from dirt or oiled filters.
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Most likely causes
- MAF sensor dirty or failing
- Intake air leak
- Filter restriction
Symptoms you may notice
- Check engine light
- Poor performance
- Stalling
Checks to run
- Clean the MAF with the correct cleaner
- Check for leaks after the filter
- Compare MAF with live data
Tools you may need
MAF cleaner
OBD-II scanner
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.