The intake air temperature signal is too low on the circuit, which reads as very hot air. The driver may notice little beyond the engine light.
Likely causes, most common first
- Short to ground in the wiring
- Faulty IAT sensor
- Damaged connector
- Water in the connector
Parts usually involved
- IAT sensor
- Sensor connector
Test before you replace
Compare live IAT with ambient temperature on a cold engine and test sensor resistance.
General guidance for generic OBD2 codes. Always follow the maker's procedure for the car in front of you.