GM Service Manual Online
For 1990-2009 cars only

System

DTCs Required to Set System Status to YES

Catalyst

DTC P0420

EGR

DTC P0401

DTC P0402

DTC P0404

DTC P0405

DTC P0406

DTC P0488

EVAP

DTC P0442

DTC P0446

DTC P0455

DTC P0456

DTC P0496

Oxygen Sensor

DTC P0131

DTC P0132

DTC P0133

DTC P0134

DTC P0137

DTC P0138

DTC P0140

Oxygen Sensor Heater

DTC P0135

DTC P0141