Code p0420 on 2002 Toyota corolla

Question

What does this code mean specific to my car?

Answer 1

mostly likely the catalytic converter is bad, unless you have other problems.

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)

https://www.autocodes.com/p0420_toyota.html