catalytic converter damaged by ignition coils? on 2002 Volkswagen GTI

The check engine light came on this week. I took it to autozone to find out why. The codes point to engine efficiency. Means either vacuum hoses or the CC. My mechanic thinks the cc is damaged from the 2 ignition coils that failed about 2 years ago. Is it possible that a failed coil can damage the CC?

by in Woonsocket, RI on January 27, 2011
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2 answers 2 comments
ANSWER by , January 27, 2011
Yes, failed coils could damage the CC, since raw, unburned fuel gets into the converter. Zee
COMMENT by , January 27, 2011
Thanks for the confirmation. Is it likely that it would take 18-24 months before it showed up? Is there a way I can tell between a vacuum hose and a damaged CC? The price differences for repair would be big, so I am hoping I can tell if the mechanic is making the right call.
COMMENT by , January 27, 2011
What are the exact diagnostic codes? Zee
ANSWER by , January 28, 2011
always clear the code and drive to see if it reappears before replacing cat very expensive and coil failure on vw s can cause cat damage but dont just replace it clear first