WOMS
P code powertrain Medium severity

P247B Exhaust Gas Temperature Out of Range Bank 1 Sensor 4

The OBD2 code P247B indicates that the exhaust gas temperature (EGT) for Bank 1 Sensor 4 is outside the expected range, suggesting a potential issue with the sensor or the exhaust system

Definition

The OBD2 code P247B indicates that the exhaust gas temperature (EGT) for Bank 1 Sensor 4 is outside the expected range, suggesting a potential issue with the sensor or the exhaust system

Common causes

  • Faulty exhaust gas temperature sensor
  • Wiring issues or damaged connectors
  • Exhaust leaks
  • Engine control module (ECM) issues
  • Incorrect sensor calibration
  • High exhaust temperatures due to engine problems
  • Poor electrical connections or corrosion

Common misdiagnoses

  • Faulty exhaust gas temperature sensor
  • Wiring issues or short circuits
  • Faulty engine control module (ECM)
  • Exhaust leaks
  • Incorrectly calibrated or malfunctioning turbocharger
  • Issues with the diesel particulate filter (DPF)
  • Problems with the fuel injection system
  • Malfunctioning catalytic converter
  • Air intake issues
  • Faulty oxygen sensors

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 Exhaust Gas Temperature Sensor

    Visual Inspection: Check the wiring and connectors for the EGT sensor. Look for signs of damage, corrosion, or loose connections

  3. 3. Sensor Condition

    If the sensor appears damaged or has been exposed to extreme conditions, it may need to be replaced

  4. 4. Test the EGT Sensor

    Resistance Check: Use a multimeter to measure the resistance of the EGT sensor. Compare the readings to the manufacturer's specifications

  5. 5. Voltage Check

    With the engine running, check the voltage output of the sensor. It should vary with temperature. If it’s out of range, the sensor may be faulty

  6. 6. Inspect the Exhaust System

    Leaks: Check for any exhaust leaks before the sensor, as this can affect the readings

  7. 7. Blockages

    Ensure that there are no blockages in the exhaust system that could affect exhaust flow and temperature

  8. 8. Check for Wiring Issues

    Inspect the wiring harness for any signs of wear, fraying, or short circuits. Repair or replace any damaged wiring

  9. 9. Review Engine Performance

    Check for any performance issues such as poor fuel economy, rough idling, or excessive smoke. These can indicate underlying problems that may affect EGT readings

  10. 10. Clear Codes and Test Drive

    After performing inspections 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. Check Engine Control Module (ECM)

    If all else fails, there may be an issue with the ECM itself. Ensure that the software is up to date and consider reprogramming or replacing the ECM if necessary

  12. 12. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the P247B code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes

  13. 13. Seek Professional Help

    If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic or technician who has experience with your vehicle's specific systems. By following these troubleshooting steps, you should be able to identify and address the cause of the P247B code