Abdiel

my check engine light recently came on and is the code P0420 Catalyst System Efficiency Bellow Threshold Bank 1.. any help would help thanks

PureDrifter

iTrader: (10)

search. common issue, rarely serious. usually an exhaust leak.

Abdiel

is there some kind of diy for the exhaust system?

PureDrifter

iTrader: (10)

its a leak. look for it. what kind of DIY would you want

Rey

My egr pipe is cracked and I occasionally get the same code. I just clear it and it comes back in about a month. Just been putting it off for a year at least hah.

deanbrown

I believe that was the code I had on my 96 and it was a leaky exhaust. It was on a bend and just old age rusted through. Try to find a shop that won't insist on changing out the catalyst, just custom make a new pipe section and weld it in.

Climb under and start listening and feeling for the leak, should be easy to find. Mine was under the heat shield:

Abdiel

thanks i changed my egr about 2 months ago but i will go to a shop today and have them check it for me thanks.