My dodge has a CEL light on, gives me a p0432 code main cat below threshold (bank 2). Wondering what I should do? If I should buy some new o2 sensors? Pre cat and post cat?

Also it gave me 2 codes for evap leak large and small? I just replaced the gas cap because the previous one did not work properly. I also replaced a hose going to the smog canister. Cleared my lights to see if that fixed the problem but wondering what I should do about the Cat sensor? Replace sensors? Replace the cat itself? If I should replace the sensors which sensors are the best and better than those crappy bosch ones I've heard about?

Thankyou
Joe

 

NTK or Denso sensors work pretty well with out trucks. Rock Auto generally has good pricing on them.

How many miles on your truck? Have you fixed the plenum yet? Federal, or California Emissions?

For the EVAP leaks, check ALL the lines....... they hang out under the truck, and tend to get brittle, and crack with age.

 

182,xxx miles on the truck. I have not fixed the plenum? And California emissions.

What is weird is I had a shop smoke the truck and they didn't find any leaks. Could it be a evap sensor that has gone bad?

 

Possibly.

How many cats under your truck?