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Guest
Posts: n/a
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My 2007 Cayman with 41,000 miles is getting a P0421 code which I think is a catalyst warmup error. Is the likely problem the drivers side secondary 02 sensor? I have stock headers/cats and a borla catback exhaust which is after the factory 02 sensors.
__________________ This post was auto-generated based upon a question asked on our tech article page here: Porsche Boxster Oxygen Sensor Replacement - 986 / 987 (1997-08) - Pelican Parts Technical Article |
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11-16-2016, 07:41 AM
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Moderator
Join Date: Jul 2012
Location: New England
Posts: 3,189
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Cat codes are almost always faulty cats, not o2 sensors.
- Nick |
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11-16-2016, 07:41 AM
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