P0156 OBD II Trouble Code 02 Sensor Circuit Malfunction (Bank 2 Sensor 2)
Detailed information on troubleshooting and repairing a P0156 DTC code which refers to a malfunction in the number 2 O2 sensor circuit on bank 2. Also includes links to relevant forum topics on the code.
Symptoms of P0156 OBD II Trouble Code
- MIL (Malfunction Indicator Lamp) illumination
- Decrease in MPG
- Increase in tailpipe emissions
Common Causes of P0156 OBD II Trouble Code
- Bad O2 sensor
- Signal shorted to voltage
- Wiring problems due to contact with exhaust components
- Holes in exhaust near o2 sensor