DTC P0030: Ho2S Heater Control Circuit Sensor 1: Description

The heating elements inside the Heated Oxygen Sensors (HO2S) minimize the time required for the sensors to reach operating temperature and then provide an accurate voltage signal. The Powertrain Control Module (PCM) controls the HO2S heater operation with a low side driver. The HO2S 1 heater diagnostic monitors the current draw through a high side driver that also supplies power to the HO2S bank 1 sensor 1 heater. If the PCM detects that the HO2S bank 1 sensor 1 heater high control circuit condition is incorrect, DTC P0030 will set.