I have a 2001 olds aurora. I got the oil changed about 2 weeks ago, and since then the display has been dinging and saying "low oil" and misreading the oil pressure and level (I know it has plenty of oil and it's running fine). Is this due to a bad sensor or what? How do I fix this, or how much shopuld I expect to pay to have it fixed? Where is the sensor(s) located?

Thanks for the help.

Switch may have dropped when oil was drained, and when filled back up, it may be hanging.
I would locate sensor, and maybe tap lightly on it.
Verify that when oil filled the filter, you are not low, and add if you need.