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.
Frequently asked questions
What is the most common cause of P0113?
The most likely cause is: Unplugged or faulty IAT sensor. Several other faults can set P0113 as well, so confirm the real cause with live data and the checks above before replacing any parts.
Can I just clear P0113 and keep driving?
Clearing P0113 with an OBD2 scanner turns the warning light off, but if the underlying fault has not been repaired the code will usually come back within a few drive cycles. Fix the cause first, then clear the code to confirm the repair worked.
How serious is P0113?
P0113 is a low-severity code. It rarely affects how the car drives, but it is still worth fixing so the engine runs efficiently and passes an emissions test.
Scan, log and diagnose with MechanicAI
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