P0111
Intake Air Temperature Sensor Range/Performance
The intake air temperature (IAT) sensor reading does not change plausibly with engine warm-up or after driving begins. Many vehicles share the IAT into the MAF housing; on those, MAF replacement also replaces IAT.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Sensor drifting outside specificationCommon
- Sensor element coated with oil or dirtPossible
- Sensor element aged beyond calibration windowLess likely
Parts involved
- Intake Air Temperature Sensor
- Mass Air Flow Sensor
P0111 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.