Thread: 2 codes

420 is a cat code. what year is you car? over a 01 you'll get that with headers.

this one https://www.google.com/search?q=P110...m=122&ie=UTF-8 is your map sensor. check its plugged in or the wires are not damaged.

for you 04 up guys if you cant find a tuner to remove the code its best to just install a real cat, you old one is not large enough, its like 2.5 it will just be a choke point if you re use it.

and we got this on the rear o2 sensor for the 01 up guys. http://www.grandprixforums.net/threa...ou-should-know

3 inch in and out. you dont want a high flow cat. you want a real cat. well need one really. the code is the rear o2 reporting cat inefficiency. aka its missing.

You want a serious quality cat to ensure it's happy. A cheap high flow will not make the pcm happy.

Originally Posted by valente

Thanks
Now to look for cat
Do you think I can find one on ebay?

you should, look for a 3 inch universal cat. make sure its not hi flow. hi flow cats are cheap, like 50 bucks. your gonna pay a bit more for a real cat.

if you cant find one on e bay, hit your local muffler shop and ask them for a price to install one.

you local muffler shop has them or can get them, its best to get it welded in too.

time to search the net. look for a universal 3 inch cat. amazon and ebay should net some results.

round fits good. oval double check the dimensions and make sure it will fit the tunnel under the car.

not sure if you saw the chat, bill says that magnaflow cat is no good for you lol

its likely hi flow, just cost more due to the name on it.