That's coming up on one of the hard stops of Shadowrun magic, Senko. Creating something from nothing is a big no.
The Fix spell works really well for some things, such as fixing the bullet holes in your ride, or repairing the damage to that bumper and axle caused by running over that troll. If you, say, clipped cables and took them with you, then it would fix any damage it could, but the device broken by the missing cable would still be nonfunctional.
Remember, magic is powerful, but not omnipotent. And I've always found spells like Fix to be better used in the same way as a medkit or stim patches might be. It keeps your gear going during the run, but doesn't necessarily eliminate the need to get it checked over or have maintenance done when you're through.
'Simple' fixes usually lead to large problems once you start expanding beyond isolated incidents.