Code
P1140
Nissan MAF
Mass airflow sensor circuit range / performance
Nissan: MAF signal out of range.
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Most likely causes
- Dirty MAF
- Intake leak
- Faulty MAF
Symptoms you may notice
- Check engine light
- Poor idle
- Lack of power
Checks to run
- Clean the MAF
- Smoke-test the intake
- Compare live readings
Tools you may need
MAF cleaner
Smoke machine
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.