Pre-Cat Failure

[95ProLeila]

the Z5 did have a pre cat, the BP's didn't.

[davens]

okay, that's interesting....mine looks like the front half of "8" on top and the back half of the "8" on the bottom. No big cat.

[95ProLeila]

could be the cat and resonator, they look pretty similar

[magicfox32]

could be the res. Im doing the same thing, I bought the straight pipe (in fact from the same site) and replacing the precat with it, and then getting a hi flow for the other. I just picked up a pro series muffler yesterday from VTR. I always get hooked up there.

[loganss]

How can I make my exhaust manifold to exhaust piping identical to the 2nd Gen protege ES model (1.8L BP engine), which has no stupid pre-cat? (Wiring changes, parts to get from ES ??)

I'm still getting the P0421 error code even after I replaced my Exhaust Manifold. And yes there was a hairline crack in my old manifold. I suspect that the pre cat is the one giving me the problem. I already replaced both O2 sensors, & primary cat.

The ideas people have thrown around in this thread is like reinventing something that already exist for our car.

Any help would be greatly appreciated.

[Naomi]

now i get error 140 after replacing practicly the whole exhaust.

[loganss]

now i get error 140 after replacing practicly the whole exhaust.

Damn, I was hoping you'd have a big success story and instructions so we can rid ourselves of the useless precat.

What's error 140? (I'm at work and my book of codes is at home)

[davens]

00140 is though....rear 02 circuit, no activity detected.