WOMS
P code powertrain Medium severity

P0664 Intake Air Temperature Sensor 1 Circuit Open

The OBD2 code P0664 indicates that there is an open circuit in the Intake Air Temperature Sensor 1, meaning the sensor is not receiving power or is not properly connected, leading to incorrect temperature readings

Definition

The OBD2 code P0664 indicates that there is an open circuit in the Intake Air Temperature Sensor 1, meaning the sensor is not receiving power or is not properly connected, leading to incorrect temperature readings

Common causes

  • Faulty intake air temperature sensor
  • Open or shorted wiring in the sensor circuit
  • Poor electrical connections or corroded connectors
  • Faulty engine control module (ECM)
  • Damaged or frayed wiring harness
  • Issues with the intake manifold or air intake system

Common misdiagnoses

  • Faulty intake air temperature sensor
  • Wiring issues or shorts in the circuit
  • Faulty engine control module (ECM)
  • Vacuum leaks
  • Faulty mass air flow sensor
  • Air filter blockage
  • Faulty throttle position sensor
  • Engine overheating issues

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 additional context for the problem

  2. 2. Inspect the IAT Sensor

    Locate the IAT sensor, which is typically found in the intake manifold or air intake duct

  3. 3. Check for physical damage to the sensor or its connector

  4. 4. Check Wiring and Connectors

    Inspect the wiring harness and connectors leading to the IAT sensor for signs of damage, corrosion, or loose connections

  5. 5. Look for any frayed wires or broken connectors that could cause an open circuit

  6. 6. Test the IAT Sensor

    Use a multimeter to test the resistance of the IAT sensor. The resistance should change with temperature. Compare your readings to the specifications provided in the vehicle's service manual

  7. 7. If the sensor is out of specification, it may need to be replaced

  8. 8. Check the Power and Ground

    Verify that the IAT sensor is receiving the correct voltage from the ECM. Use a multimeter to check for power at the sensor connector

  9. 9. Ensure that the ground connection is solid and free of corrosion

  10. 10. Inspect the Intake System

    Check for any vacuum leaks or obstructions in the intake system that could affect the sensor's readings

  11. 11. Clear Codes and Test Drive

    After performing repairs or replacements, clear the trouble codes using the OBD-II scanner

  12. 12. Take the vehicle for a test drive to see if the code returns

  13. 13. Seek Professional Help

    If you are unable to resolve the issue after following these steps, consider seeking assistance from a professional mechanic who has experience with OBD-II diagnostics. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P0664 code