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Both pre and post are in roller-coaster mode which, of course, indicates a failing cat. I changed the contaminated/corroded O2 sensor and went on a trip of about 800 miles or so over 3 days. No CEL for that period. I get back and putter around town a bit and bingo! A CEL pops up.
Looking for a used bank 2 pre-cat.
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James now has: 2008 987S 6 speed
Crashed: 2010 987.2 pdk in speed yellow! 
Sold to a cool racer chick: 2004 986 S
YouTube channel: the PORSCHE as seen by NewArt
www.youtube.com/channel/UCohdrH2xHTklM1thxk0KKOQ?
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