My engine is on read code p0420-how to fix it

Question

My engine light is on computer code p0420 dodge stratus 2005 4 cyl. how to fix problem.
I had the code wipe out but after a few days it came back.

Answer 1

most likely the catalytic converter is bad if there are no engine issues.

the car will need to be checked.

Possible 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)