DTC P0141: Heated Oxygen Sensor Heater Circuit (Sensor 2): Operation
Power is supplied from the MFI relay (terminal No. 1) to the rear Heated Oxygen Sensor (HO2S) heater. The PCM (terminal No. 26) controls continuity to the rear HO2S heater by turning the power transistor in the PCM on and off. The PCM checks whether the heater current is within a specified range when the heater is energized. See Fig 1 .