Monitor Strategy
| Related DTCs | P0420: Catalyst deterioration (bank 1) P0430: Catalyst deterioration (bank 2) |
| 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 | Approximately 30 seconds |
| MIL Operation | Immediate |
| Sequence of Operation | None |