SEVERAL ENGINE CODES 2000 deville ANY SUGGESTIONS? PLEASE HELP

I have 4 engine codes coming on,  If anyone knows the awnsers to any of these questions I would appreciate the knowladge.

1.  P0102, which is a MAF sensor code, I want to know if you just replace the sensor will it fix it?

2.  P0385, It is a Generic Crankshaft position sensor B circuit malfunction, I wanted to know if I need to replace the crankshaft sensor or if I can bring it to a GM dealer and have them sync it to the computer without replacing it? also where is the Crankshaft sensor located at?

3. P1372, Crankshaft position CKP Sensor A B Correlation,  What does that code meen? and If I repaced the sensors would it fix it?

4. P1153, Heated Oxygen Sensor Insufficient switching bank 2 sensor1, I want to know If I were to replace the Oxygen sensor would it fix this and where is the oxygen sensor located?

Year ?
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Engine?
 
The codes you listed point to a Northstar engine.
That is the only Caddy i know to have 2 crank sensors.
But i would rather not guess at your problem.
http://www.cadillacforum.com/m_9792/tm.htm

im sorry it is a 2000 Deville 4.6

Two codes you listed could be set by problems with the crank sensors.
Your year and model had several updates on the crank sensors.
The latest ones are black (bottom) and grey(top) in color.
If your crank sensors are the old yellow and tan i would get the new ones on there before going further.

would you know how to describe exaxtly where on the top and bottom they are? I just have no Idea what im looking for and there are so many sensors that I see I cant tell which one it would be.  Thanks for your replies

If you locate the oil filter then look up and right(towards the driver side) on the engine block.
Directly behind the front motor mount bracket.