P0132 - O2 Sensor 1/1 Circuit High: Notes

Fig 1: Identifying Oxygen Sensor Wiring Diagram

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Theory of Operation

The Oxygen Sensors (O2 Sensor) are used for fuel control and catalyst monitoring. Each O2 Sensor compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the Powertrain Control Module (PCM) operates in an Open Loop mode, ignoring the O2 Sensor signal voltage while calculating the air-to-fuel ratio. The heating elements inside each O2 Sensor heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the PCM to calculate the air-to-fuel ratio sooner. While the engine runs, the O2 Sensor heats up and begins to generate a voltage within a range of 0-1, 275 mV. Once sufficient O2 Sensor voltage fluctuation is observed by the PCM, Closed Loop is entered. The PCM uses the O2 Sensor voltage to determine the air-to-fuel ratio. An O2 Sensor voltage that increases toward 1, 000 mV indicates a rich fuel mixture. An O2 Sensor voltage that decreases toward 0 mV indicates a lean fuel mixture.

>>When Monitored:<< Continuously with the engine running, no O2 sensor heater DTCs present, Oxygen Sensor 1/1 heater temperature within a specific range and battery voltage greater than 10.4 Volts.
>>Set Condition:<< The Oxygen Sensor voltage is above the maximum acceptable value. The DTC will set as Pending after one trip and Active after two trips. Three good trips to turn off the MIL.

Possible Causes
(K41) O2 SENSOR 1/1 SIGNAL CIRCUIT SHORTED TO VOLTAGE
(K902) O2 SENSOR 1/1 RETURN CIRCUIT SHORTED TO VOLTAGE
(K41) O2 SENSOR 1/1 SIGNAL CIRCUIT OPEN
(K902) O2 SENSOR 1/1 RETURN CIRCUIT OPEN
O2 SENSOR 1/1
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to Pre-Diagnostic Troubleshooting Procedure .