OBD System Description - Oxygen Sensor Monitor

OBD System Description - 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 during monitoring conditions once per driving cycle. 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 once per diving cycle.

DTC Description / Detecting Condition / Confirmation Procedure

P0131, P0132

Refer to P0131 DTC P0131 / P0132: Heated Oxygen Sensor (HO2S) Circuit Low / High Voltage (Bank-1 Sensor-1).

P0133

Refer to P0133 DTC P0133: Heated Oxygen Sensor (HO2S) Circuit Slow Response (Bank-1 Sensor-1).

P0134

Refer to P0134 DTC P0134: Heated Oxygen Sensor (HO2S) No Activity Detected (Bank-1 Sensor-1).

P0137, P0138

Refer to P0137 DTC P0137 / P0138: Heated Oxygen Sensor (HO2S) Circuit Low / High Voltage (Bank-1 Sensor-2).

Primary HO2S Monitor

Operation