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bad milage and o2 sensor

88manche

NAXJA Forum User
Location
Portland, Oregon
So i may have a bit of a problem. I've been having REALLY bad millage lately. Now I'm on 33's with stock 3.55 gearing, and i expect to get bad millage, but this is really bad.

I think i found my problem though.

39f5fbc5a95e.jpg


Correct me if i'm wrong, but that broken thing is supposed to be an o2 sensor, right?
 
haha, yup. I just replaced both o2 sensors on my 98 that's on 33's and stock 3.55's. I went from 12 to 19 mpg. (and the 19 was with a fully loaded jeep, i.e. 4 big tires in the back and a bunch of other stuff).
 
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