the dash arrow on my 95 850 came on. I changed the fluid how do I clear the code? thanks

 

Changing the fluid may or may not fix your problem. If you have the flashing up arrow it usually isn't the fluid. You may have a problem with the PNP switch getting dirty or worn out.

You might also have hit the "Winter" switch next to the shifter.

You can read and reset trouble codes from under the hood with the diagnostic panel.

http://www.matthewsvolvosite.com/read-codes-volvo-850