The intake air temperature sensor's signal is reading higher than physically plausible — the computer sees it as an open circuit condition, which usually points to a wiring fault rather than the engine's actual intake air being unusually hot.
Symptoms
- Often no noticeable drivability symptom
- Possible slightly rougher cold-start behavior, since the computer may misjudge intake air temperature during warm-up
- Check engine light on
Likely causes
- Open circuit in the sensor wiring (broken wire) — the most common cause of a "high input" fault on this type of sensor
- Failed intake air temperature sensor itself
- Corroded or disconnected connector at the sensor
How to diagnose it
- Check the sensor connector for a secure, corrosion-free connection first
- Test the sensor's resistance with a multimeter against the spec table for known temperatures
- Check continuity of the wiring between the sensor and the ECU if the sensor itself tests fine
Typical fixes & cost
- Replace the intake air temperature sensor30–120 EUR
- Repair a broken wire or damaged connector50–180 EUR
Code names are compiled from open/standardized SAE and ISO references. Explanations, symptoms, causes and fixes are original. Covers generic (P0/C0/B0/U0) codes only — manufacturer-specific codes are planned for a future update.
AS
Reviewed by Artyom SemenovAutomotive Editor · Fact-checked by Yauheni Kapliarchuk, Editor-in-Chief