Monitored Emission Control Systems

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The OBD II System monitors all emission control systems that are on-board. The OBD II regulations require monitoring of the following:

The air conditioning system
The catalytic converter efficiency
Comprehensive component monitoring-Emission related inputs and outputs
The evaporative emission (EVAP) system
The fuel delivery system
Heated catalyst monitoring
Misfire monitoring
The oxygen sensor system (O2S or HO2S)
The oxygen sensor heater system (HO2S heater)

For the specific DTCs required for each system, refer to Inspection/Maintenance (I/M) System DTC Table . Systems such as fuel delivery, misfire, and comprehensive components may not be listed in a system status list. These tests run continuously and do not require an I/M System Status indicator.