P0113 — Intake Air Temperature Sensor 1 Circuit High
Low severityWhat it means
The signal voltage from the intake air temperature (IAT) sensor is higher than plausible — typically meaning the circuit is open or the sensor is unplugged. The engine control unit then sees an impossible reading (often −40 °C) and fuels the engine incorrectly.
Common symptoms
- Check engine light
- Poor fuel economy
- Rough running on cold starts
- Hesitation in some cases
Likely causes
- Unplugged or faulty IAT sensor
- Broken wiring or corroded connector pins
- Sensor integrated in the MAF — a MAF fault
- Damaged sensor element
What to check first
- Check that the sensor connector is seated and the pins are clean
- Compare the IAT reading with ambient temperature on a cold engine in live data — a −40 °C reading means an open circuit
- Inspect the wiring between the sensor and the engine control unit
- Replace the sensor if wiring checks out
Can you keep driving?
Drivable; fuel economy and cold running suffer until fixed. It is usually a cheap repair.
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