DTC P0031: O2 Sensor Heater Circuit Low 1/1 Or DTC P0032: O2 Sensor Heater Circuit High 1/1: Description

Heater circuit for 1/1 Heated Oxygen Sensor (HO2S) is monitored when battery voltage is more than 10.6 volts and engine coolant temperature is less than a specified temperature, but within a set temperature difference of battery temperature sensor. DTC will set in Powertrain Control Module (PCM) memory when PCM senses HO2S heater circuit is less than a predetermined value.