P2199
Intake Air Temperature Sensor 1/2 Correlation
The two intake air temperature sensors disagree by more than the calibrated correlation threshold during stable conditions. The ECU cannot determine which value is correct.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- One IAT sensor driftingCommon
- Wiring issue on one sensorPossible
Parts involved
- Intake Air Temperature Sensor
- IAT Wiring
P2199 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.