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

Circuit is monitored after engine has been running for more than 2 minutes and engine coolant temperature is more than 170°F (77°C). DTC will set when 1/2 HO2S voltage is .35-.55 volt for 60 seconds. Possible causes are: defective 1/2 HO2S, open or high resistance in signal circuit, open or high resistance in sensor ground circuit or defective PCM.