P2247: O2 Sensor Reference Voltage Circuit/Open Bank 2 Sensor 1

Definition

The OBD2 code P2247 indicates a problem with the oxygen sensor reference voltage circuit for Bank 2, Sensor 1, specifically that the circuit is open or has a fault, preventing proper voltage from reaching the sensor

Common causes

Faulty O2 sensor
Open or shorted wiring in the O2 sensor circuit
Poor electrical connections or corroded connectors
Faulty engine control module (ECM)
Damaged or frayed wiring harness
Issues with the O2 sensor reference voltage supply
Exhaust leaks near the O2 sensor
Grounding issues in the circuit

Common misdiagnoses

Faulty oxygen sensor
Wiring issues or shorts
ECU/PCM failure
Fuel system problems
Vacuum leaks
Exhaust leaks
Mass air flow sensor issues
Catalytic converter problems

Troubleshooting steps

1. Check the O2 Sensor
2. Inspect the O2 sensor for physical damage, corrosion, or contamination
3. If the sensor is damaged, replace it
4. Inspect Wiring and Connectors
5. Check the wiring harness and connectors leading to the O2 sensor for any signs of wear, fraying, or damage
6. Ensure that all connections are secure and free of corrosion
7. Test the O2 Sensor Voltage
8. Use a multimeter to measure the voltage at the O2 sensor connector. The reference voltage should typically be around 0.5 to 1.0 volts (check the specific vehicle's specifications)
9. If the voltage is absent or significantly lower than expected, there may be an issue with the wiring or the Engine Control Module (ECM)
10. Check the Reference Voltage
11. Measure the reference voltage coming from the ECM to the O2 sensor. If the reference voltage is missing or incorrect, the ECM may be faulty or there may be an open circuit
12. Inspect the Ground Circuit
13. Ensure that the ground circuit for the O2 sensor is intact. A poor ground connection can lead to incorrect sensor readings
14. Check for Short Circuits
15. Inspect the wiring for any short circuits to ground or to other circuits that could affect the O2 sensor's operation
16. Scan for Additional Codes
17. Use an OBD-II scanner to check for any other related trouble codes that may provide additional context for the issue
18. Clear the Code and Test Drive
19. After performing any repairs, clear the trouble code and take the vehicle for a test drive to see if the code returns
20. Refer to the vehicle's service manual for specific diagnostic procedures and specifications related to the O2 sensor and its circuit
21. Seek Professional Help
22. If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician for further diagnosis. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P2247 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check the O2 Sensor

2. Inspect the O2 sensor for physical damage, corrosion, or contamination

3. If the sensor is damaged, replace it

4. Inspect Wiring and Connectors

5. Check the wiring harness and connectors leading to the O2 sensor for any signs of wear, fraying, or damage

6. Ensure that all connections are secure and free of corrosion

7. Test the O2 Sensor Voltage

8. Use a multimeter to measure the voltage at the O2 sensor connector. The reference voltage should typically be around 0.5 to 1.0 volts (check the specific vehicle's specifications)

9. If the voltage is absent or significantly lower than expected, there may be an issue with the wiring or the Engine Control Module (ECM)

10. Check the Reference Voltage

11. Measure the reference voltage coming from the ECM to the O2 sensor. If the reference voltage is missing or incorrect, the ECM may be faulty or there may be an open circuit

12. Inspect the Ground Circuit

13. Ensure that the ground circuit for the O2 sensor is intact. A poor ground connection can lead to incorrect sensor readings

14. Check for Short Circuits

15. Inspect the wiring for any short circuits to ground or to other circuits that could affect the O2 sensor's operation

16. Scan for Additional Codes

17. Use an OBD-II scanner to check for any other related trouble codes that may provide additional context for the issue

18. Clear the Code and Test Drive

19. After performing any repairs, clear the trouble code and take the vehicle for a test drive to see if the code returns

20. Refer to the vehicle's service manual for specific diagnostic procedures and specifications related to the O2 sensor and its circuit

21. Seek Professional Help

22. If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician for further diagnosis. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P2247 code