I have a 1999 S80 t6 turbo and had a "service engine system message come up. I reset it and had a code "44" come up. Does anyone know what that code means. I called my Shop and of course they don't know and I need to bring it in.
Thanks for your help.

I was having a similar problem I would have to add coolant about once a week. It turned out that the o rings where the coolant lines tie into the turbo charger were bad and had to be replaced.