P0112 Intake air temperature sensor 1 circuit low (bank 1)
What P0112 means
The voltage from the intake air temperature sensor is below range, which the engine computer reads as an extremely high air temperature. It ignores the sensor and uses a default value.
P0112 is a generic SAE J2012 code: it means the same on every make. The exact cause still depends on the car, so read the freeze-frame data before replacing parts.
At a glance
- Severity
- Low
- Typical repair cost
- 30–150 €
- Workshop time
- 0.2–1 h
- Repair difficulty
- Easy
- DIY possible
- Yes
- Check engine light
- Yes
- Affects emissions test
- Yes
Parts and labour at an independent workshop in Europe. Main dealers charge more; the cause decides the bill, not the code.
Symptoms
- Check engine light on
- Usually little change in driving
- Possible slightly reduced power or higher fuel consumption
Common causes
- Internally shorted IAT sensor
- Signal wire shorted to ground
- Moisture or corrosion in the connector
- Faulty MAF sensor with integrated IAT
Can I keep driving with P0112?
You can keep driving. Have it checked within one to two weeks; it does not normally harm the engine.
What to check first
- Read the live IAT value: a reading far above the real temperature confirms the fault.
- Unplug the sensor: if the reading drops to a very low value, the wiring is fine and the sensor is shorted.
- If the reading stays high with the sensor unplugged, look for the signal wire shorted to ground.
- Dry and clean the connector, then replace the sensor if needed.
Related codes
- P0111 Intake air temperature sensor 1 range/performance (bank 1)
- P0113 Intake air temperature sensor 1 circuit high (bank 1)
- P0110 Intake air temperature sensor 1 circuit (bank 1)
- P0115 Engine coolant temperature sensor 1 circuit
- P0116 Engine coolant temperature sensor 1 range/performance
- P0117 Engine coolant temperature sensor 1 circuit low
- P0118 Engine coolant temperature sensor 1 circuit high
- P0108 Manifold absolute pressure / barometric pressure sensor circuit high
Data: TORKO fault-code catalogue, built on OBDex (CC0-1.0) and reviewed against workshop practice. Informational only — it does not replace a diagnosis by a mechanic.
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