OBD System Description - A/F Sensor and HO2S Monitor

OBD System Description - A/F Sensor and HO2S Monitor

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 continuously monitored for activity.

HO2S
HO2S is used for catalyst monitoring and fuel control system (sub feedback). During monitoring, HO2S monitors max. and min. output voltages and compares the voltages with malfunction criteria.

DTC Description/Detecting/Confirmation Procedure

P0131, P0132
Refer to DTC P0131/P0132/P0134/P2237. P0131

P0133
Refer to DTC P0133. P0133

P0134
Refer to DTC P0131/P0132/P0134/P2237. P0131

P0137, P0138
Refer to DTC P0137/P0138. P0137

P0139, P013E
Refer to DTC P0139/P013E. P0139

P2195, P2196
Refer to DTC P2195/P2196. P2195

P2237
Refer to DTC P0131/P0132/P0134/P2237. P0131

P2A01
Refer to DTC P2A01. P2A01

A/F Sensor Monitor

Operation