Forum: Boxster General Discussions
09-07-2010, 06:38 AM
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Replies: 4
Views: 1,975
Not Porsche specific answer, but looks like...
Not Porsche specific answer, but looks like perhaps your Cat has gone bad. Could also be caused by bad 02 sensor or MAF.
http://freeautomechanic.blogspot.com/2007/10/check-engine-code-p0420.html
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