OBD Code P0113: Intake Air Temperature Sensor Circuit High — Quick Fix

What does code P0113 mean?

Code P0113 (Intake Air Temperature Circuit High Input) means the IAT sensor is sending a voltage above the expected range to the ECU — typically reading an unrealistic sub-zero temperature when the engine is warm.

Low severity: the engine runs slightly rich as a precaution, but there's no risk of mechanical damage.

Symptoms

• Check engine light (solid)
• Slight fuel consumption increase (5-10%)
• Cold start may take marginally longer
• Overall performance largely unaffected

Causes & fixes

1. Oxidised or loose connector (30%)

The IAT connector sits in the intake and is subject to vibration. Unplug and replug, clean the pins.

👉 Contact cleaner spray on Amazon UK — £8-10

2. Open circuit in wiring

A broken wire between sensor and ECU. Measure resistance across the sensor (normal: 2-3kΩ at 20°C).

3. Failed IAT sensor

The NTC thermistor inside has gone open-circuit. On most modern cars the IAT is integrated into the MAF sensor housing.

👉 IAT sensor on Amazon UK — £10-25

Repair cost

Can I drive with P0113?

Yes, no urgency. Fix within 2 weeks to avoid a MOT failure (check engine light = fail since 2018).