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Old 09-07-2010, 06:04 AM   #1
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P0420 code

Got this check engine light this morning. My OBD read the following:

"P0420 catalyst efficiency below threshold"

can someone give me some details on this?
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Old 09-07-2010, 06:38 AM   #2
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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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Old 09-07-2010, 07:05 AM   #3
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Probably O2 sensor or Cat - when I had my Mustang , we had MIL eliminators which trick the O2 sensor into thinking the Cat was ok when in fact it was removed, Don't know if these exist for the Boxster
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Old 09-07-2010, 07:09 AM   #4
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put a scan tool on it and look at the 02 data
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Old 09-07-2010, 07:59 AM   #5
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Thanks guys. I've been getting O2 sensor warnings. So that's probably it.
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