The battery is located under the back seat. Simply pull up on the rear seat with a firm grip (grab the seat close to where your feet would be if you were sitting in it). The battery is located on the floor board behind the passenger seat. Simply remove the cables and take the battery out.
Probably every 50K should be sufficient
There is no 2004 Aurora. The last model made was 2002.
Here is a link with info on the Oldsmobile Aurora 2001-2003 http://consumerguideauto.howstuffworks.com/2001-to-2003-oldsmobile-aurora.htm
Anywhere from $31000-$35000
.050"
3.5 is 18.5 gallons, 4.0 is 17.5 gallons
This depends. Are you referring to the battery temp sensor? if so it is under the rear seat with the battery, small little plastic part that is no longer made. If that is the part, you will need to have your battery relocated to the trunk and the alternator rebuilt to run without the feed from that sensor.
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FROM THE BATTERY
Check your battery cables. I had same issue
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