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I also had a P0420, the Bank 1 cat code and it turned out to be the MAF.
(Accompanied by P01026, P01033)
I sprayed the MAF and the plug/harness contacts with MAF cleaner, then cleared the codes and the code has not come back in a week of daily driving.
I also pulled the air filter and found bits of paper in the filtered side of the airbox, that looked like a part sticker had come apart and somehow ended up on the filtered side down by the water drain hole.
Probably a contributing factor to fouling the MAF.
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"It broke because it wants to be Upgraded  "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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