P0146 OBD II Trouble Code 02 Sensor Circuit No Activity Detected (Bank I Sensor 3)

Detailed information on troubleshooting and repairing a p0146 DTC code which refers to the O2 sensor circuit with no detected activity. Also includes links to relevant forum topics on the code.

Symptoms of P0146 OBD II Trouble Code

  • MIL (Malfunction Indicator Lamp) on
  • May idle or drive poorly
  • Fuel economy may decrease

Common Causes of P0146 OBD II Trouble Code

  • Bad Bank 1, position 3, o2 sensor
  • Wiring problem, melted harness, broken connectors, etc.
  • Bad PCM