Monitored Emission Control Systems

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. 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.