P0420 Toyota -

Question

What to do after getting a p0420 code when I already changed the catalyst converter , spark plugs , o2 sensors and injector cleaner ?

Answer 1

Hi there,

Here is a list of possible causes for this code.

P0420 TOYOTA - Catalyst System Efficiency Below Threshold Bank 1

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