i am getting both p0420 and p0430 codes, what do you think?

Question

when both codes appear, what does that generally mean?

Answer 1

HI there,

It could actually be caused by the fuel you are using. Different types and times of the year the fuel companies add different things to the fuel. I would clear the codes and see if they return. If they do, then chances are fairly good you will need to replace the converters. IF you have any exhaust leaks it may also cause issues with the converters.