My Service Engine pale is on because I installed a big flow catalytic converter? What can I do give or take a few it?

I had a glorious flow catalytic converter installed on my 2003 chevy S-10 and now my check engine street lamp is on. Before installing the cat, I reprogrammed the computer with Hypertech Power Programming. About ten miles after have the cat installed the light come on. I checked with the installer and he said that the O2 sensor looked within need of replacing and AutoZone concured. I replaced the sensor and the insubstantial still came on. I later went spinal column to the installer to have him patch a small filter in one of the weld and he said i should try removing the power Programming. I did so, the stupid light come on again!

Any ideas? Anyone?

Will i simply have to dance back to running a stock cat?

Does anybody know how i can achieve...

Answers: You should be capable of get an O2 simulator. The giant flow cat is making the rear O2 sensor freak out, so you will any need to own the rear O2 code delete from your PCM or you will need an O2 simulator for the backside O2 sensor. They typically run $30-$50. Your only other risk is to replace the new soaring flow cat with an OEM cat.

My 1998 Subaru Legacy GT predetermined seem...

It really sounds approaching a back pressure problem. The open out exhaust is not allowing a certain amount of wager on pressure on the system. That's my first thought.

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My Service Engine standard lamp is on because I installed a giant flow catalytic converter? What can I do just about it?

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