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I have a similar problem but didn't consider the O2 sensor. It was replaced twice, a long time ago, but only after the "engine" light came on. Could an O2 sensor be bad without causing the light to come on?

Thanks.

is it a bosch or denso/ngk o2 sensor?


89 4Runner
3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels
TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim