I am getting mine back tomorrow after a pesky CEL. I too had the P0200 Code, and it was either P1476 or P1475, not sure which one. However it was related to the microswitch for the resonance flap. Evidently when the flap opened the switch wasnt recognizing it. I will post the results. I was also having a problem that I couldnt get it over 4500RPMs the Service Advisor said this switch was probably causing the driveability issues also.

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Dennis
2006 E320 CDI Black/Black Leather. Nav, HTD Seats HK stereo 32000 miles.
2000 VW Passat 1.8t 300,000 miles as of Dec 09, 2009 original owner
1997 E300d Silver 300,000 miles As of Jan 05, 2010
3rd owner SOLD