Code P0420/P0430

The cats are covered under the federally mandated emissions warranty for 8 years or 80,000 miles. If you are in that range, head on down to your local dealer and get them to install new cats.

If you have headers installed you should remove them and reinstall the stock manifold before you go to the dealer. If you have a 4.0 and installed the short tube headers they will not cover it under warranty since you modified the cat. So, you could do this:
http://www.urdusa.com/index.php?cPath=66_170&osCsid=l4vuevhaeafq00s7mc7ecesoa7

Gadget

 

How do you know the problem was not the O2 sensors? Reading the PDF for codes P0420 and P0430 says you should replace:

- A/F Sensor
- O2 Sensors
- or Cats.


I just had these 2 codes display. Should I replace the O2 sensors first or just take it to the dealer for the cats?

 

I guess when my light comes back on I shall head on to the dealer. Hopefully they won't mind that I am at 96,xxx miles...

 

Well the dealer said no I will not be covered under warranty.. ugh.. and my county has tailpipe emissions testing.. 97,xxx miles

 

miles? Probably just need to replace the cats. I got a pair from a guy in FL. worked out great.

 

Just got my codes 0420, and 0430 202K miles...