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This code is the bane of my existence.... Not on an F body though, I've had it on my Subaru. Replaced the whole exhaust system 3 going on 4 years ago. The muffler rotted already, and that damn code is on. How the hell can a cat go bad in 3 years I don't know. But yeah, I've read in my case its the cat or the O2 sensors, some replaced one or the other and it went away. Some replaced it all and still have the light. Thing that bugs me is, it does go away for a short time (once it did so to get it through emissions) then it comes back. Hope you have better luck with your light than I did with mine. I'm due for emissions this year and the daily has a whole rap sheet of other problems so I'm trading in before I have to get it through.
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