Monitor Strategy
| Related DTCs | P0420: Catalyst deterioration P0430: Catalyst deterioration |
| Required Sensors / Components (Main) | Air fuel ratio sensor and heated oxygen sensor |
| Required Sensors / Components (Related) | Intake air temperature sensor, mass air flow meter sub-assembly, crankshaft position sensor and engine coolant temperature sensor |
| Frequency of Operation | Once per driving cycle |
| Duration | About 30 seconds |
| MIL Operation | 2 driving cycles |
| Sequence of Operation | None |