DTC P0134: Ho2S Circuit Insufficient Activity - Bank 1, Sensor 1; P0154: Ho2S Circuit Insufficient Activity - Bank 2, Sensor 1: Description

Powertrain Control Module (PCM) supplies about .45 volt to Heated Oxygen Sensor (HO2S). The HO2S generates a voltage that varies from about one volt when exhaust is rich to about .10 volt when exhaust is lean. PCM monitors and stores sensor voltage information and evaluates the voltage samples to determine amount of time sensor voltage is out of range.