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The location of the sensors depends on the year. On my '01 S, there are 2 sensors for each bank, one before and one after the pre-cat, nothing attached to the 2nd cat. Often diagrams are drawn/labelled to cover more than one model and may show various possibilities.
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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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