P0154 OBD II Trouble Code 02 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)

Detailed information on troubleshooting and repairing a P0154 DTC code which refers to an O2 sensor circuit with no activity. Also includes links to relevant forum topics on the code.

Symptoms of P0154 OBD II Trouble Code

  • MIL (Malfunction Indicator Lamp) illumination
  • Other codes indicating rich or lean condition may be present
  • Poor idle, won't idle
  • Misfire at idle or at highway speed
  • Engine may blow black smoke at tailpipe
  • Fuel economy may decrease
  • May start and stall

Common Causes of P0154 OBD II Trouble Code

  • Faulty bank 2,1 Oxygen sensor
  • Holes in exhaust near oxygen sensor
  • Short to voltage or ground on signal circuit
  • Open or high resistance in signal circuit
  • Wiring harness chafing/rubbing on exhaust components
  • Water/oil intrusion at O2 sensor connector
  • Broken lock or loose terminals on O2 sensor connector
  • Oil/coolant fouled oxygen sensor