Hi daytona53. Welcome to the forum. Where did you hear a catalytic converter always lasts the life of the car? If that were true, the parts stores wouldn't have dozens of them in stock. For a 6 cylinder engine, you should have a left and a right converter. Each one will have an oxygen sensor ahead of it and after it. The front ones determine if the fuel / air mixture is correct. The second one monitors the converter efficiency or how well it is working. It is more common to have a failed oxygen sensor, but the diagnostic fault code will specify that. A defective converter will set a different fault code.
Caradiodoc
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Wednesday, July 14th, 2010 AT 1:05 PM