P1811 is transmission component slipping. Seek professional help immediately or you will do serious damage to the transmission if you continue to drive it.
Trouble code P1811 means: Long Shift & Max Adapt
Maximum Adapt and Long Shift
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The ODB chart (http://autorepair.about.com/od/obdcodedatabase/a/OBD_1996_year.htm) doesn't show a code with that number. Are you sure about the number and the year of the car?
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That is cooling fan 1 control circuit malfunction. check out the fan motor, and temperature sending unit, fan relay, and fuse.
Fix the leak, and fill the coolant.
To fix sunroof in a 200 Oldsmobile Aurora, first detect where the leak is coming from. Apply marine sealant to the affected area and let dry completely.
I've read that this code might be a downstream O2 sensor. Possibly on the passenger side and pre-catalytic converter.
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