Inspection/Maintenance Description and Operation: Notes
Some state/provincial and local governments require that a vehicle pass on-board diagnostic (OBD) system tests and the Inspection/Maintenance (I/M) emission inspection in order to renew license plates. This is accomplished by viewing the I/M System monitors on a scan tool and confirming that no Permanent DTCs are set.
The OBD II system monitors all emission control systems that are on-board. The OBD II regulations require monitoring of the following:
| Monitor | Diesel | Gasoline |
|---|---|---|
| Boost System Monitor - Since Diagnostic Trouble Codes Cleared | X | - |
| Catalytic Converter Monitor - Since Diagnostic Trouble Codes Cleared | X | X |
| Evaporative Emission Monitor - Since Diagnostic Trouble Codes Cleared | - | X |
| Exhaust Aftertreatment Monitor - Since Diagnostic Trouble Codes Cleared | X | - |
| Exhaust Gas Recirculation Valve/Camshaft Position Monitor - Since Diagnostic Trouble Codes Cleared | X | X |
| Exhaust Gas Sensor Monitor - Since Diagnostic Trouble Codes Cleared | X | - |
| Fuel System Monitor - Since Diagnostic Trouble Codes Cleared | X | X |
| Heated Catalytic Converter Monitor - Since Diagnostic Trouble Codes Cleared | - | X |
| Misfire Monitor - Since Diagnostic Trouble Codes Cleared | X | X |
| Oxygen Sensor Heater Monitor - Since Diagnostic Trouble Codes Cleared | - | X |
| Oxygen Sensor/Heated Oxygen Sensor Monitor - Since Diagnostic Trouble Codes Cleared | - | X |
| Particulate Filter Monitor - Since Diagnostic Trouble Codes Cleared | X | X |