WOMS
P code powertrain Medium severity

P2199 Intake Air Temperature Sensor 1/2 Correlation

The OBD2 code P2199 indicates a correlation issue between the readings of two intake air temperature sensors, suggesting that their values are not consistent with each other, which may affect engine performance and...

Definition

The OBD2 code P2199 indicates a correlation issue between the readings of two intake air temperature sensors, suggesting that their values are not consistent with each other, which may affect engine performance and emissions

Common causes

  • Faulty intake air temperature sensor
  • Wiring issues (shorts, opens, or corrosion)
  • Poor electrical connections
  • Faulty engine control module (ECM)
  • Vacuum leaks
  • Intake manifold leaks
  • Incorrectly calibrated or malfunctioning mass air flow sensor
  • Temperature sensor placement issues

Common misdiagnoses

  • Faulty intake air temperature sensor
  • Faulty mass air flow sensor
  • Vacuum leaks
  • Faulty engine coolant temperature sensor
  • Faulty throttle position sensor
  • Air filter blockage
  • Faulty engine control module (ECM)

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Addressing related codes can help pinpoint the issue

  2. 2. Inspect the IAT Sensor

    Visual Inspection: Check the IAT sensor for any physical damage, corrosion, or loose connections

  3. 3. Wiring and Connectors

    Inspect the wiring harness and connectors for fraying, breaks, or poor connections

  4. 4. Test the IAT Sensor

    Resistance Test: Measure the resistance of the IAT sensor at different temperatures to ensure it is functioning within specifications. Compare the readings to the manufacturer's specifications

  5. 5. Voltage Test

    With the engine running, check the voltage output of the IAT sensor. It should vary with temperature changes

  6. 6. Check for Air Leaks

    Inspect the intake system for any vacuum leaks or issues that could affect the air temperature readings. Look for cracks in hoses, loose clamps, or damaged intake components

  7. 7. Inspect the Engine Coolant Temperature (ECT) Sensor

    Since the IAT sensor readings are compared to the ECT sensor, ensure that the ECT sensor is functioning correctly. Test it similarly to the IAT sensor

  8. 8. Check the Mass Air Flow (MAF) Sensor

    If equipped, inspect the MAF sensor for proper operation. A malfunctioning MAF sensor can affect air temperature readings and engine performance

  9. 9. Examine the Engine Control Module (ECM)

    Ensure that the ECM is functioning correctly. In rare cases, a software issue or internal fault in the ECM can cause erroneous readings

  10. 10. Clear Codes and Test Drive

    After performing repairs or adjustments, clear the trouble codes and take the vehicle for a test drive to see if the code returns

  11. 11. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the P2199 code for your specific vehicle make and model. Manufacturers may have specific fixes or updates

  12. 12. Professional Diagnosis

    If the issue persists after performing the above steps, consider seeking help from a professional mechanic or technician who has access to advanced diagnostic tools. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P2199 code