DTC P0140: 1/2 O2 Sensor Stays At Center: Description

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1/2 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 1/2 HO2S signal voltage is .35-.55 volt for 1.5 minutes. Possible causes for DTC to set are: defective 1/2 HO2S, defective PCM, defective connectors or defective wiring.