I have a 98 stratus 2.4 which refuses to clear or is resetting a rear o2 code after the sensor has been replaced and the cables have been disconnected and rubbed together, washed with holy water and everything else I can think of. Has anyone else come across this phenomenon and have they found a cause and/or solution to this problem? There is a chance that I have a hairline crack in the exhaust manifold.It is not making any noise as of yet but I have a suspition that it is cracked because everyone that is in the scrapyard is cracked.