HELP!!

My 2001 X5 3.0L auto just went from being one of my favs to worse... With zero indication my SES and transmission light came on. Now the X5 is way way down on power, like I have to shift it into 4th just to get over an interstate overpass! I am driving from Houston to Savannah, Georgia currently and on my PDA now.

I stopped by Autozone and scanned the OBD and came up with a host of codes.

P0355
P0175
P0727
P1500

I called a dealer enroute and they have a Crankshaft Position Sensor in stock... so I am going to pick that up. Can anyone tell me if 1) you think that would cause the tranny light to come on and shift harsh as it seems like it has not a clue. 2) where is the Crank sensor located on the engine?

Any ideas will be greatly appreciated!

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