P1101
Mass Air Flow Sensor Out of Self-Test Range
Moderate· Fix soonDIY friendlyPowertrainManufacturer: Ford
What it means
On Ford vehicles the MAF sensor reading was outside the expected range during a self-test. Often caused by a dirty sensor or an air leak.
Is it safe to drive?
Usually drivable. Fix soon.
Symptoms
- Check engine light on
- Hesitation
- Rough idle
Probable causes
Most likely first
- 1Dirty MAF sensor
- 2Air leak after the MAF
- 3Faulty MAF sensor
How to diagnose it
Work through these in order before buying parts
- 1Clean the MAF sensor with MAF cleaner.
- 2Check the intake boot for cracks.
- 3Check for technical service bulletins (TSBs) or software updates for your make and model; some codes have known factory fixes.
Common fixes
- Clean or replace the MAF sensor
- Repair intake leaks
This information is general guidance for the listed makes. Exact causes, specifications and procedures vary by vehicle, so confirm with your service manual or a qualified mechanic before replacing parts.