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P code powertrain Medium severity

P2085 Exhaust Gas Temperature Sensor Circuit Intermittent Bank 1 Sensor 2

The OBD2 code P2085 indicates an intermittent issue with the exhaust gas temperature sensor circuit for Bank 1, Sensor 2, which measures the temperature of the exhaust gases to help manage emissions and engine...

Definition

The OBD2 code P2085 indicates an intermittent issue with the exhaust gas temperature sensor circuit for Bank 1, Sensor 2, which measures the temperature of the exhaust gases to help manage emissions and engine performance

Common causes

  • Faulty exhaust gas temperature sensor
  • Damaged wiring or connectors
  • Poor electrical connections
  • Short circuit or open circuit in the sensor circuit
  • Corrosion or contamination at the sensor or connector
  • Exhaust leaks affecting sensor readings
  • Engine control module (ECM) issues

Common misdiagnoses

  • Faulty exhaust gas temperature sensor
  • Wiring issues or short circuits
  • Faulty engine control module (ECM)
  • Exhaust leaks
  • Incorrectly diagnosed catalytic converter issues
  • Misdiagnosed fuel system problems
  • Ignition system faults
  • Other sensor failures (e.g., oxygen sensors)

Troubleshooting steps

  1. 1. Visual Inspection

    Wiring and Connectors: Check the wiring and connectors leading to the EGT sensor for any signs of damage, corrosion, or loose connections. Look for frayed wires, broken connectors, or any signs of wear

  2. 2. Sensor Condition

    Inspect the EGT sensor itself for physical damage or contamination

  3. 3. Check for Other Codes

    Use an OBD-II scanner to check for any other related trouble codes. Sometimes, multiple codes can provide additional context for the issue

  4. 4. Test the EGT Sensor

    Resistance Check: Measure the resistance of the EGT sensor using a multimeter. Compare the readings to the specifications provided by the manufacturer. If the resistance is out of range, the sensor may be faulty

  5. 5. Voltage Check

    With the engine running, check the voltage output of the EGT sensor. It should vary with temperature. If the voltage is not within the expected range, the sensor may need replacement

  6. 6. Inspect the Circuit

    Continuity Test: Perform a continuity test on the wiring harness to ensure there are no breaks in the circuit. Check for continuity between the EGT sensor connector and the Engine Control Module (ECM)

  7. 7. Ground Check

    Ensure that the ground connection for the EGT sensor is secure and functioning properly

  8. 8. Check for Intermittent Issues

    Since the code indicates an intermittent issue, monitor the vehicle under different conditions (e.g., temperature changes, engine load) to see if the code reappears. This can help identify if the problem is temperature-related or due to vibration

  9. 9. Inspect Related Components

    Check other components in the exhaust system that may affect the EGT sensor, such as the catalytic converter or exhaust leaks, which could lead to incorrect readings

  10. 10. Clear Codes and Test Drive

    After performing the checks and repairs, clear the trouble codes using the OBD-II scanner. Take the vehicle for a test drive to see if the code returns

  11. 11. Replace the EGT Sensor

    If all tests indicate that the EGT sensor is faulty, replace it with a new one. Ensure that the replacement part meets OEM specifications

  12. 12. Recheck System

    After replacing the sensor, recheck the system to ensure that the new sensor is functioning correctly and that the P2085 code does not return

  13. 13. Consult a Professional

    If the issue persists after following these steps, it may be necessary to consult a professional mechanic or technician for further diagnosis, as there may be more complex issues at play. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P2085 code