P0111 Code: Intake Air Temperature Sensor 1 Range/Performance
🟢 Low severity · drivable
You can drive normally, but fuel economy may drop while the sensor reading is off.
What P0111 means
The IAT sensor is working, but its reading does not match what the computer expects. The air temperature reading may be stuck or changing too slowly. This can cause poor fuel economy and rough running.
Symptoms
- Check engine light on
- Poor fuel economy
- Rough idle
- Engine runs slightly rich or lean
Common causes
- most common: Faulty IAT sensor
- common: Wiring or connector damage
- less common: Sensor contamination
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the IAT sensor | Yes | $20–80 |
| Repair the wiring or connector | Yes | $20–80 |
| Clean the sensor | Yes | $0–10 |
Frequently asked questions
Can I drive with P0111?
Yes, but the engine may run slightly rich or lean and fuel economy can drop until the sensor is fixed.
What does range/performance mean?
It means the sensor signal is not believable compared to other engine readings, even though the circuit is intact.
How do I test the IAT sensor?
Measure its resistance with a multimeter and compare it to the spec for the current air temperature.
Related codes
P0110
P0110 Code: Intake Air Temperature Sensor 1 Circuit
P0112P0112 Code: Intake Air Temperature Sensor 1 Circuit Low
P0113P0113 Code: Intake Air Temperature (IAT) Sensor Circuit High Input
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.