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2003 Subaru Impreza 2.5L with engine code P0420

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2003 Subaru Impreza 2.5L with engine code P0420, what is the meaning of the code? how do I repair it?

Vehicle: 2003 Subaru Impreza 2.5L

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most likely the catalytic converter is bad

other rare causes

- Three way catalyst converter Bank 1
- Exhaust tube
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
- Improper ignition timing
- Engine Control Module (ECM)

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