Oxygen Sensor Electrical Integrity Check

Monitoring electrical integrity of oxygen sensor is an ongoing functional check made under normal vehicle operation which pertains to faults with either the wiring, connectors, or sensor. If the monitored sensor voltage exceeds maximum threshold value, DME will interpret signal as a short to voltage. If the monitored sensor voltage is below the minimum threshold value the DME will interpret the signal as a short circuit or a short to ground. If the monitored voltage of the sensor remains unchanged or within a predetermined voltage range after the sensor has been heated and the engine temperature has exceeded a predefined threshold, the DME will interpret the signal as an open. (Separate fault code set - Siemens only). See OXYGEN SENSOR ELECTRICAL CHECK  table.