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Exhaust sensor?

829 Views 2 Replies 3 Participants Last post by  4x4Mark, 
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Just had the truck in the shop, emissions light kept coming on. The dealer replaced the exhaust backpressure sensor. It showed only 12.8psi. What symptoms would this have and what differences should I feel with this replaced if any? Thanks in advance for your time.
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Jim,
Thanks for all of your knowledgeable responses. You do a great job of adding detail, yet keeping it well understood for the layman!

Mark
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