DTC P0051: O2 Sensor Heater Circuit Low 2/1 DTC P0052: O2 Sensor Heater Circuit High 2/1: Description

Heater circuit for 2/1 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.