P0420 code

[TimAustinW]

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]

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]

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]

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

[TimAustinW]

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