Runs perfect but O2 and engine lights on

Last post on Aug 24, 2009 at 11:22 AM

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#1 of 1 Runs perfect but O2 and engine lights on by gen1troop Aug 24, 2009 (11:22 am)
Hey all, Just put a fresh 2.6 engine in a '91 trooper. It runs great but O2 and Check Engine lights on. Tried resetting but they come back. All I can think of is I hooked something up wrong but no clue where that might be. As I said it runs great so don't think it's a vacuum line or anything like that. Anyone have some guidance for me? Thanks.