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O2 Sensor

Deuce212

By Deuce212
in Ask A GM Technician

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Deuce212 New Member

Deuce212

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Hey guys, I have a 98 GMC Sierra, 4.3L. Im thinking of changing my o2 sensor(s). I noticed that my fuel is depleting much faster than when i first bought the truck and i want to check and possibly changed them.

 

Im a little new at this, so i was wondering if yall had any info. on where to find them and how to check if they are bad. I think they are down around my catalitic converter but im not sure, any help would be appreciated. Also im guessing I have 2? correct?

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