Monitored Emission Control Systems
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix, 2003 Chevrolet Malibu, and 2003 Buick Century. 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. Not all vehicles have a full complement of emission control systems. For example, a vehicle may not be equipped with Secondary Air Injection (AIR) or Exhaust Gas Recirculation (EGR). The OBD II regulations require monitoring of the following:
- Air conditioning system.
- Catalytic converter efficiency.
- Comprehensive component monitoring. Emission related inputs and outputs.
- Evaporative Emissions (EVAP) system.
- Exhaust Gas Recirculation (EGR) system.
- Fuel delivery system.
- Heated catalyst monitoring.
- Misfire monitoring.
- Oxygen Sensor or Heated Oxygen Sensor (O2S or HO2S) system.
- Oxygen Sensor Heater (HO2S Heater) system.
- Secondary Air Injection (AIR) system.
For the specific DTCs required for each system, refer to INSPECTION/MAINTENANCE SYSTEM DTCS . Systems such as fuel delivery, misfire, and comprehensive components may not be listed in a system status list. These tests run continuously on some vehicles and may not require an indicator.