09-07-2010, 06:04 AM
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#1
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Registered User
Join Date: Oct 2007
Location: Dallas, TX
Posts: 295
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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?
__________________
TimAustinW
http://i226.photobucket.com/albums/d...ignature-1.jpg
02 Seal Grey, NHP Headers w/ Highflow Cats/2ndary Bypass Pipes, smoked side markers/3rd brake light, exterior match interior trim, 986 Lloyds Mats, 986 deck lid emblem, arctic silver intake grills, ipod link, painted calipers, Glass Window Robbins Top with defroster kit, Bose Sound System, Leather lower door panels, Console Lid w embroidered crest; Stainless door sills; Painted Bumperettes; Custom Hood Crest
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09-07-2010, 06:38 AM
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#2
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07 Carrera S Cab
Join Date: Nov 2005
Location: New Jersey
Posts: 2,273
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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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Current: 07 Carrera S Cab in Midnight Blue
Previous: 01 Boxster in Arctic Silver, 86 944 in Guards Red
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09-07-2010, 07:05 AM
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#3
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Registered User
Join Date: Aug 2010
Location: baston
Posts: 12
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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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09-07-2010, 07:09 AM
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#4
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Registered User
Join Date: Apr 2010
Location: trenton nj
Posts: 449
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put a scan tool on it and look at the 02 data
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09-07-2010, 07:59 AM
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#5
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Registered User
Join Date: Oct 2007
Location: Dallas, TX
Posts: 295
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Thanks guys. I've been getting O2 sensor warnings. So that's probably it.
__________________
TimAustinW
http://i226.photobucket.com/albums/d...ignature-1.jpg
02 Seal Grey, NHP Headers w/ Highflow Cats/2ndary Bypass Pipes, smoked side markers/3rd brake light, exterior match interior trim, 986 Lloyds Mats, 986 deck lid emblem, arctic silver intake grills, ipod link, painted calipers, Glass Window Robbins Top with defroster kit, Bose Sound System, Leather lower door panels, Console Lid w embroidered crest; Stainless door sills; Painted Bumperettes; Custom Hood Crest
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2001 Porsche Boxster
2007 Carrera S Cabriolet
Hybrid Mode
