Monitor Strategy
| Related DTCs | P0420: Catalyst Deterioration |
| Required Sensors/Components (Main) | Air fuel ratio sensor Heated oxygen sensor |
| Required Sensors/Components (Related) | Intake air temperature sensor Mass air flow meter Crankshaft position sensor Engine coolant temperature sensor |
| Frequency of Operation | Once per driving cycle |
| Duration | About 30 seconds |
| MIL Operation | 2 driving cycles |
| Sequence of Operation | None |