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Re: O2 sensor replacement question
Yeah, either one being bad can cause a noticeable mpg loss, the EFI isn't running in it's most efficient mode.
But if any are bad it should also cause a error code and trip the engine light.
Big question, what made you take it to the shop to begin with?
If just lower mpg, could be other things.
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84 4Runner - ARBed 5.29s F&R, 4.7 & 2.28 t-cases, Chevys, AP x-over, BudBuilt x-member, 2" drv trn lift, 36" TSLs, 30 spline Longs
80 something p/u - Buick 231 V6/TH-350 trans, Holley 4 bbl, Weiand intake, dual batts, dual tanks ...
89 4Runner - stock
2000 Isuzu Trooper + 2010 Sonata
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