2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
98 ram 1500 5.2l 2wd. check engine lights come on every week or some after city driving and its always the o2 sensor so my question to you is does the downstream o2 sensor effect gas milage because ive heard its only for emmissions is this true?
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Well all kinds of things happen if the cat is clogged. But that has nothing to do with your question about the post cat o2 sensors. Which has already been answered. And from what I've read here, you have no cat(s) anyway. And since gutting the cat will usually result in a loss of low end, you may be on the gas harder to get the truck rolling. Which in turn, will result in worse mpg.
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