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.
Affected components
- Intake air temperature sensor
- Mass air flow sensor
Common causes
- High likelihood: Sensor drifting outside specification
- Medium likelihood: Sensor element coated with oil or dirt
- Low likelihood: Sensor element aged beyond calibration window
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.