"Just in case anyone was following this thread, I went to my appointment at the dealer today and it turns out the problem was along the lines of what MTL suggested. The VSV valve was stuck open. Replacement part $44, labor $150. "
http://www.yotatech.com/showthread.p...ighlight=P0446
Thats for the P0446 code.
another helpful thread:
http://www.yotatech.com/showthread.p...ighlight=P0446