After reading more posts I am wondering if I will need a codereader to determine the fault codes. See this post for my references: https://www.matthewsvolvosite.com/forums/viewtopic.php?t=91 If I do need the codereader I assume that this is what Autozone has and will use for me for free, rather than...

Tsquared, thanks so much for the info. I'll try to read the codes myself tommorow morning, although I'm not sure what the "flylead" is or where to find this code reading apparatus under the hood. If I cant do it myself I will go to an autozone. Also, do you know any other weblinks for code...

just bought a 1997 850 with 58K miles. Looked awesome and drove impecably. Immediatly after driving off the used car lot we filled it up with gas. Then right after starting the car there was a shaking from the engine that was not felt durring test drives. Check engine light also turned on. After con...