DTC P0154: 2/1 O2 Sensor Stays At Center: Description

2/1 Heated Oxygen Sensor (HO2S) voltage is monitored with engine running for more than 2 minutes and engine coolant temperature is more than 170°F (76.7°C). DTC will set in Powertrain Control Module (PCM) memory if 2/1 signal voltage is .35-.55 volt for 1.5 minutes. Possible causes for DTC to set are: defective 2/1 HO2S, defective PCM, defective connectors or defective wiring.