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My check engine light is on.  So, I went I went to AutoZone and had them run the diagnostic test.  It came back w/ three codes, the Oxygen Sensor, Cam sensor (or camshaft sensor), and the Crankshaft sensor.  The guy said I had to replace all of them.  I knew about the Oxygen sensor, but I didn't about the other two.  Long story short, I can't figure out how to replace the other two because I don't know where they're located.  Does anyone have any ideas?  Also, are there any special things to do w/ replacing them, or is it a synch. Any help would be GREATLY appreciated as I can't find any information about this on the net.

Thanks in advance! (I hope!)