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No brotha, not here in Colorado.I'm thinking they might only in Denver tho? I live in pueblo maybe 100,000 people if that.lol

Who will fail me? I've never had any one of my vehicles tested for emissions. But thanx everyone, I went ahead and replaced o2 sensor.. light went off...putting magnaflo cat back exhaust system this week!! Thanx again everyone for the replies.

Thanx for advice.but where I'm from they don't make us do emission tests so it's not enforced.I'm also doing on a budget, was basically trying to see if I can kill 2 birds with 1 stone.does anybody know when they do a cat back exhaust system do they still use the#2 o2 sensors or remove/bypass them?

Thank god for this forum.Help plz.heres the problem...on my 99 Tahoe 5.7L the check engine light would go on and off, now it's stays on.codes I get from advanced are P0141( oxygen sensor #2 bank 1), P0171 (fuel trim system lean bank 1), P0420( catalyst system low efficiency bank 1).so I was...