Monitored Emission Control Systems

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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 exhaust gas recirculation (EGR). The OBD II regulations require monitoring of the following:

Comprehensive component monitoring-Emission related inputs and outputs
The EGR system
Misfire monitoring

For the specific DTCs required for each system, refer to Inspection/Maintenance (I/M) System DTC Table .