what causes the cadalystic converter to go on 1996 Lincoln Town Car

what would make you have to replace the catalystic converter

Asked by for the 1996 Lincoln Town Car
To suppliment Zee's thought -- A huge killer of converters is when your engine is wasting fuel and dumping it out the exhaust. Fuel raises already very high temperatures to a new level, and the abnormal heat causes damage.
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The regular lifetime of a catalytic converter is about 100,000 miles and it will be greatly effected by the fuel quality, engine performance ( poorly maintained engine put more stress on the converter), oil quality and also the mechanical condition of the engine.