Error code

OBD2 P0111

OBD2P0111
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Intake Air Temperature Sensor 1 Circuit Range/Performance.

Severity

moderateCan drive, but performance issues may occur.

Summary

P0111 indicates an issue with the Intake Air Temperature Sensor 1 circuit's range or performance. This sensor is located in the engine intake system.

Symptoms

  • Engine misfires
  • Poor fuel economy
  • Check Engine light

Common Causes

  • Defective IAT Sensor
  • Contaminated Sensor due to poor air filter or excessive PCV blow-by
  • Improper Installation of the sensor
  • Rodent damage in stored vehicles

Diagnosis

  1. Check sensor resistance with a DVOM
  2. Verify voltage and signal at the IAT connector
  3. Inspect wiring between ECU and IAT sensor for open circuits or shorts

Fixes

  • Replace defective Intake Air Temperature Sensor

FAQ

What is the cost of replacing an IAT sensor?

Replacement costs can vary, but typically range from less than $100 to several hundred dollars depending on whether it's integrated with the MAF sensor.

How do I prevent rodent damage in stored vehicles?

Store vehicles indoors or use protective covers and deterrents like mothballs to keep rodents away from wiring.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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