View Full Version : P0420 Code Help Please

10-21-2010, 08:07 AM
My 2001 Forester threw a P0420 code at 142K miles, I am going to change both O2 sensors and replace the exhaust gaskets but if I have to replace the Cat can I use the 49 state converter or do I have to use the 50 state converter ? The sticker states Californis emissions on the engine sticker/plate. The Catco brand looks good and they sell both types. I live in Pa and would like to save $ but want the car to run well. Any thoughts? Thanks

11-23-2010, 09:30 PM
I replaced both o2 sensors but still get the P0420 code after driving a bit. Should I have changed the exhaust gaskets also??? Or is there another possible cause?

11-24-2010, 08:47 AM
Who is this guy??? This is the third bogus post.