GM Service Manual Online
For 1990-2009 cars only

System

DTCs Required to Set System Status to YES

Catalyst

DTC P0420 Catalyst System Low Efficiency

Exhaust Gas Recirculation (EGR)

DTC P0400 Exhaust Gas Recirculation (EGR) System

DTC P0403 Exhaust Gas Recirculation (EGR) Solenoid Control Circuit

Evaporative Emission (EVAP)

DTC P0440 Evaporative Emission (EVAP) System

DTC P0443 Evaporative Emission (EVAP) System No Flow During Purge

DTC P0455 Evaporative Emission (EVAP) System Leak

Oxygen Sensor

DTC P0131 HO2S Circuit Low Voltage Sensor 1

DTC P0132 HO2S Circuit High Voltage Sensor 1

DTC P0133 HO2S Slow Response Sensor 1

DTC P0134 HO2S Insufficient Activity Sensor 1

DTC P0136 HO2S Circuit Sensor 2

Oxygen Sensor Heater

DTC P0135 HO2S Heater Performance Sensor 1

DTC P0141 HO2S Heater Performance Sensor 2