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Old 02-23-2014, 01:15 PM
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glcarter glcarter is offline
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Join Date: Jul 2011
Location: Iowa
Age: 49
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Vehicle: 2011 Ram 2500
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Engine: 2010-20?? 345ci (5.7L) Hemi V8 383hp 400lb/ft (2500/3500)
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You need either a muffler or cat to provide enough back pressure for the O2 sensors to work properly. They need to have the back pressure to get to operating temp to work right. At least that was what I was told at the dealer.

When I started reading this thread the first thought was the cat was bad. They were actually recalled at one time. The ceramic would break and the holes through it would no longer line up, that is what happened to mine. Got so bad that I would have to down shift the manual trans to climb a slight grade.
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