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P code powertrain Medium severity

P0667 Intake Air Temperature Sensor 2 Circuit

The OBD2 code P0667 indicates a malfunction in the circuit of the Intake Air Temperature Sensor 2, which is responsible for measuring the temperature of the air entering the engine

Definition

The OBD2 code P0667 indicates a malfunction in the circuit of the Intake Air Temperature Sensor 2, which is responsible for measuring the temperature of the air entering the engine

Common causes

  • Faulty intake air temperature sensor 2
  • Open or shorted wiring in the sensor circuit
  • Poor electrical connections or corroded connectors
  • Faulty engine control module (ECM)
  • Intake air temperature sensor 2 circuit interference
  • Vacuum leaks affecting sensor readings
  • Contaminated or damaged sensor components

Common misdiagnoses

  • Faulty Intake Air Temperature Sensor 1
  • Engine Coolant Temperature Sensor issues
  • Mass Air Flow Sensor problems
  • Air Filter blockage
  • Vacuum leaks
  • Wiring or connector issues
  • Engine control module (ECM) faults
  • Fuel system problems

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues

  2. 2. Inspect the IAT Sensor

    Locate the Intake Air Temperature Sensor 2. Check for physical damage, corrosion, or loose connections at the sensor and its wiring harness

  3. 3. Ensure that the sensor is properly seated in its connector

  4. 4. Check Wiring and Connectors

    Inspect the wiring harness for any signs of wear, fraying, or damage. Look for broken wires or poor connections

  5. 5. Check the connectors for corrosion or bent pins that could affect the electrical connection

  6. 6. Test the IAT Sensor

    Use a multimeter to test the resistance of the IAT sensor. Compare the readings to the manufacturer's specifications. If the resistance is out of range, the sensor may need to be replaced

  7. 7. If possible, test the sensor while the engine is running to see if the readings change with temperature

  8. 8. Check the ECM

    Ensure that the Engine Control Module (ECM) is functioning properly. Sometimes, a faulty ECM can cause erroneous codes

  9. 9. Check for any software updates or recalls related to the ECM

  10. 10. Inspect the Air Intake System

    Check for any leaks or blockages in the air intake system that could affect the sensor readings

  11. 11. Ensure that the air filter is clean and not obstructing airflow

  12. 12. Clear Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner

  13. 13. Take the vehicle for a test drive to see if the code reappears. Monitor the IAT readings during the drive

  14. 14. Consult Repair Manual

    If the issue persists, consult the vehicle’s repair manual for specific diagnostic procedures related to the IAT sensor and circuit

  15. 15. Seek Professional Help

    If you are unable to resolve the issue after following these steps, it may be best to consult a professional mechanic for further diagnosis and repair. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P0667 code