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Originally Posted by 1989GT
If the rear O2's aren't there and they haven't been turned off by a tuner/chip of some sort then yeah that'll cause a check engine light. Take the car down to auto zone and have them scan the codes (it's free) then post 'em up.
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I took my 98 gt and had a scan ran for codes . the code that was found is P0420 CATALYST EFFICIENCY BELOW THRESHOLD ( BANK 1). DOES ANYONE KNOW WHAT THE PROBLEM COULD BE????