DTCS P0031 Or P0032: Ho2S Bank 1, Sensor 1 - Heater Circuit Low/High: Condition

DTC P0031 is set when Bank 1 HO2S No. 1 heater current is less than .09 amps, or potential difference between heater positive and negative terminals is more than 13.99 volts while HO2S heater is on. MIL is illuminated when Engine Control Module (ECM) detects malfunction during 2 consecutive drive cycles.

DTC P0032 is set when Bank 1 HO2S No. 1 heater current is more than 5.32 amps, or potential difference between heater positive and negative terminals is less than 11.95 volts while HO2S heater is on. MIL is illuminated when ECM detects malfunction during 2 consecutive drive cycles.