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Well my sons 99 Dakota just had a mil light come on the scanner says error code po420, I know this code is related to the o2 in fact it came on a few years ago and after replaceing the rear 02 and several hours of chasing wires I found some wires chafed through the wire harness inside the l/f wheel well behind an acess panel, these were repaired and all was good for the next two years, I had a quick look with a flash light in the dark and rain at the repair I made and it looked ok but after reading some info on po420 it says that an exhaust leak could also trigger this code, the truck has a broken exhaust stud on the right manifold but it has been that way for 1.5 years now and causes no more than a slight tick, do you think a stud would cause this code or any other ideas?, thanks, oh yeah 5.2 l 5spd stick