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 P0131
P0133
Refer to DTC P0133 P0133
P0134
Refer to DTC P0131 P0131
P0137, P0138
Refer to DTC P0137 P0137
P0139
Refer to DTC P0139 P0139
P2195, P2196
Refer to DTC P0131 P0131
P2237
Refer to DTC P0131 P0131
P2A01
Refer to DTC P2A01 P2A01

A/F Sensor Monitor

Operation