Pelican Parts Forums - Question on Boxster 02 Sensor

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Kenny (guest)

11-16-2016 07:41 AM

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.

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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

Nick at Pelican Parts

11-16-2016 07:41 AM

Cat codes are almost always faulty cats, not o2 sensors.

- Nick

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