DTC P0130 & P0150: Ho2S Bank 1 & 2 Sensor 1 Circuit: Description

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

The Heated Oxygen Sensor (HO2S) is a sensor used to detect the oxygen content in the exhaust. The Powertrain Control Module (PCM) supplies the sensor with a signal circuit and a ground circuit. The PCM supplies a bias voltage between the circuits. The sensor varies the voltage based on the oxygen content in the exhaust. When the exhaust stream is lean (more oxygen), the sensor produces a low voltage signal. When the exhaust stream is rich (less oxygen), the sensor produces a high voltage signal. The PCM monitors the HO2S signal during Closed Loop. In order to correct for rich or lean conditions, the PCM adjusts the injector pulse width. This DTC indicates that the signal frequency of the HO2S indicates an active sensor (Closed Loop), but the amplitude (voltage) of the signal remains within an incorrect range.