Detection Condition

DTC P0135 indicates HO2S-11 heater circuit (front Bank 1 on 3.0L or front on 2.0L) is open, shorted to ground, shorted to VPWR or has low or high current draw.

DTC P0141 indicates HO2S-12 heater circuit (rear) is open, shorted to ground, shorted to VPWR or has low or high current draw.

DTC P0155 indicates HO2S-21 heater circuit (front Bank 2 on 3.0L) is open, shorted to ground, shorted to VPWR or has low or high current draw.

DTC P0161 indicates HO2S-22 heater circuit (rear) is open, shorted to ground, shorted to VPWR or has low or high current draw.

HO2S heater heats HO2S sensor to temperatures of 1400°F (760°C). VPWR circuit supplies voltage to heater with PCM completing circuit ground when proper conditions are present.