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OBD-II · Engine and powertrain (P)

P0112

Intake air temperature sensor circuit low

What it means

The intake air temperature signal voltage is too low, which the ECU would read as extremely hot air. This is usually a short to ground.

Symptoms

  • engine warning light
  • often no noticeable change; sometimes poorer starting or slightly rough running
  • slightly higher fuel consumption

Likely causes, most likely first

Likely causes, most likely first
No.Cause
01signal wire short to ground
02failed IAT sensor
03damaged wiring or connector
04ECU input fault

What to check, step by step

  1. 01After the car has stood overnight, compare intake air, coolant and outside temperature in live data: they should be within a few degrees
  2. 02Inspect the sensor connector and wiring; on many European cars the IAT is built into the MAF or boost pressure (TMAP) sensor
  3. 03Measure the sensor resistance against temperature and compare with specification
  4. 04Replace the sensor (or the combined MAF/TMAP sensor) if the wiring is good