DTC P0131: 1/1 O2 Sensor Shorted To Ground: Description
WARNING: This page is about a different car, the 2000 Dodge Intrepid, 2000 Chrysler LHS, 2000 Chrysler Intrepid, 2000 Chrysler Concorde, and 2000 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.
1/1 Heated Oxygen Sensor (HO2S) voltage is monitored after ignition is turned off and 1/1 HO2S cools down, and after the next time ignition is turned on, provided engine coolant temperature is less than 98°F (37°C) and ambient/battery temperature is within plus or minus 27°F (3°C) of engine coolant temperature. DTC will set in Powertrain Control Module (PCM) memory when PCM senses 1/1 HO2S voltage is less than .156 volt for 28 seconds after engine is started. Possible causes for DTC to set are: defective 1/1 HO2S, defective PCM, defective connectors or defective wiring.