986 Forum - The Community for Porsche Boxster & Cayman Owners

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- Boxster General Discussions (http://986forum.com/forums/boxster-general-discussions/)

- - P0420 code (http://986forum.com/forums/boxster-general-discussions/26063-p0420-code.html)

TimAustinW

09-07-2010 06:04 AM

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?

Boxtaboy

09-07-2010 06:38 AM

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

porscheboxstah

09-07-2010 07:05 AM

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

extanker

09-07-2010 07:09 AM

put a scan tool on it and look at the 02 data

TimAustinW

09-07-2010 07:59 AM

Thanks guys. I've been getting O2 sensor warnings. So that's probably it.

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