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Message: <blockquote data-quote="Wes8398" data-source="post: 406378" data-attributes="member: 9883">When I removed the rear O2's (the fairly new ones) they were absolutely COVERED in carbon. None of the perforations were clogged or anything, but they had a lot of carbon build up on 'em. Is that an indication of anything important? I already have a sneaking suspicion that my cats are shot, but I'm not worried about that ... I just want the engine running right. One more interesting thing ... one of the rears looked to have a few drops of some type of liquid on it. I smelled it and didn't really get a strong gas smell or anything, but what else could it have been? When I wiped it off with my finger, it seemed to eat away the carbon and leave everything squeaky clean. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite5" alt=":confused:" title="Confused    :confused:" loading="lazy" data-shortname=":confused:" />And FYI the old front O2's seemed to look "normal" considering their age. Nowhere NEAR the carbon build-up that the rears had. Actually, they were virtually carbon-free.The "macro" setting on my camera wasn't working very well...but here are a couple pics. The fuzzy looking one is the one with the moisture on it ... you can kinda see it if you look closely. <img src="http://i88.photobucket.com/albums/k180/WesHinchcliffe/CIMG1286.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="http://i88.photobucket.com/albums/k180/WesHinchcliffe/CIMG1288.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>