DTC P0031: O/2 Sensor Heater Circuit Low 1/1 Or DTC P0032: O/2 Sensor Heater Circuit High 1/1: Notes

NOTE: The 1/1 HO2S may also be referred to as an upstream oxygen sensor. On California vehicles, 1/1 HO2S is located on front of left catalytic converter. On non-California vehicles, 1/1 HO2S is located in exhaust pipe in front of catalytic converter.

NOTE: For circuit identification and wiring diagram, see WIRING DIAGRAMS article. If Powertrain Control Module (PCM) is replaced, PCM must be reprogrammed. See PROGRAMMING . After each repair procedure has been completed, reconnect all components. Perform TEST VER-5: OBD-II MONITOR VERIFICATION under VERIFICATION TESTS to ensure system is functioning properly unless otherwise stated.