DTC P0130: Closed Loop Rationality - Sensor 1: Description

Heated Oxygen Sensor (HO2S) is used to detect oxygen content in the exhaust. The Powertrain Control Module (PCM) supplies HO2S with a signal circuit and a ground circuit. The PCM supplies a bias voltage between the circuits. The HO2S varies voltage based on oxygen content in the exhaust. When exhaust stream is lean (more oxygen), HO2S produces a low voltage signal. When exhaust stream is rich (less oxygen), HO2S produces a high voltage signal. The PCM monitors HO2S signal during closed loop. To correct for rich or lean conditions, PCM adjusts injector pulse width. Diagnostic Trouble Code (DTC) will set if HO2S 1 signal voltage remains within a calibrated range for about 16 seconds during 120 second monitoring period.