Possible Cause
P0420
- Three way catalyst (manifold)
- Exhaust tube
- Intake air leakage
- Fuel injector
- Fuel injector leakage
- Spark plug
- Improper ignition timing
P0430
- Three way catalyst (manifold)
- Exhaust tube
- Intake air leakage
- Fuel injector
- Fuel injector leakage
- Spark plug
- Improper ignition timing
- Harness or connectors (The sensor circuit is open or shorted.)
- Fuel tank temperature sensor