P0158 OBD II Trouble Code 02 Sensor Circuit High Voltage (Bank 2 Sensor 2)

Detailed information on troubleshooting and repairing a P0158 DTC code which refers to a high voltage in the number 2 O2 sensor circuit on bank 2. Also includes links to relevant forum topics on the code.

Symptoms of P0158 OBD II Trouble Code

  • MIL (Malfunction Indicator Lamp) on
  • Engine loses power and misses intermittently
  • May exhibit loss of fuel efficiency
  • Engine running rich

Common Causes of P0158 OBD II Trouble Code

  • Bad o2 sensor (Bank 2 Sensor 2)
  • Wiring in contact with exhaust components
  • Engine running rich (If other codes are present)
  • Holes in exhaust causing PCM to over-rich engine resulting in an abnormally high Bank 2, sensor 2 reading
  • Short to voltage on signal circuit
  • Bad PCM