Bimmerfest - BMW Forums - View Single Post - Catalytic converter gone bad...time for exhaust :)
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Old 10-11-2012, 09:56 PM
jdholder jdholder is offline
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Location: Irvine, CA
Join Date: Feb 2004
Posts: 26
Mein Auto: 97 M3, 03 F350, M3 Racer
Cats don't "go bad". There is a problem within the combustion cycle (lean or rich) or there is contamination within the converter (coolant from a head gasket, or oil from rings).

Figure out what's wrong before you do anything. Those codes will lead you to what caused the failed cats, not a result of.

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