A/F Sensor and HO2S Monitor (EVAP Leak Check Model)

OBD System Description - A/F Sensor and HO2S Monitor (EVAP Leak Check Model)

System Description / Monitoring Procedure

A/F sensor
A/F sensor is monitored maximum and minimum voltage, maximum and minimum current, lean-to-rich and rich-to-lean response rates when monitoring conditions are met. The sensor is also monitored for activity continuously.

HO2S
HO2S is used for catalyst monitoring and fuel control system (sub feed back). During monitoring conditions, HO2S is monitored max. and min. output voltages and compares the voltage with malfunction criteria.

DTC Description / Detecting / Confirmation Procedure

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

P0133
Refer to DTC P0133: O2 Sensor Circuit Slow Response / Performance (Sensor-1, Bank-1). P0133

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

P0137,P0138
Refer to DTC P0137 / P0138: O2 Sensor Circuit Low Voltage / High Voltage (Sensor-2, Bank-1) (EVAP Leak Check Model). P0137

P0139
Refer to DTC P0139: O2 Sensor Circuit Slow Response (Sensor-2, Bank-1). P0139

P2195, P2196
Refer to DTC P2195 / P2196: O2 Sensor Signal Stuck Lean / Stuck Rich (Sensor-1, Bank-1). P2195

P2237
Refer to DTC P2237: O2 Sensor Positive Current Control Circuit / Open (Sensor-1, Bank-1). P2237

P2A01
Refer to DTC P2A01: O2 Sensor Circuit Range / Performance (Sensor-2, Bank-1). P2A01

A/F Sensor Monitor