I have a 1995 85o turbo auto with 152000 miles and I have the same problem with codes from b1 122 124 126 132 134 151 211what wood all that be a bad ground or a bad senser ? When I do test it will not test the speedomider and the car did sit for some time as well as the cooling fan never seem to come on by my temp never gos over 3 o'clock on gauge I have replaced and tested relays what else could it be?

 

Have you reset the codes and see what came back?

 

Yes they do

 

Connect an OBDII to it and see if you get a clearer answer. There is probably just one main issue here and the rest are children.

 

Have you looked the codes up on Matt's site?

 

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

 

OBDII port on a 1995 Above and a little to the left of the shifter.