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check engine light


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im runing a b20 in a 95hb its obd1 stock dx wiring,i got a check engine light, when i unplug the o2 it dusent make eney difrence i changed the o2 like 3 difrent ones still the engine lights is on i got all vacuume hoses in the right place what can be the problem? if eney one ever had this let me know what will fix it

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