Oxygen Sensor Monitor

System Description / Monitoring Procedure

Primary HO2S
For a primary HO2S, the system monitors maximum and minimum voltage, lean-to-rich and rich-to-lean response rates, and switching cycles. The sensor is also monitored for activity continuously.

Secondary HO2S
A secondary HO2S is used for catalyst monitoring only. During monitoring conditions, the system measures maximum and minimum output voltages and compares the voltage with malfunction criteria.

DTC Description / Detecting Condition / Confirmation Procedure

P0131, P0132 Refer to DTC P0131 / P0132: O2 Sensor Circuit Low / High Voltage (Sensor-1).

P0133 Refer to DTC P0133: O2 Sensor Circuit Slow Response (Sensor-1).

P0134 Refer to DTC P0134: O2 Sensor No Activity Detected (Sensor-1).

P0137, P0138 Refer to DTC P0137 / P0138: O2 Sensor Circuit Low / High Voltage (Sensor-2).













Primary HO2S Monitor






Primary HO2S Circuit Monitor





Secondary HO2S Circuit Monitor





MODE $06 Data