You probably don't want to drive it or even start the motor until someone has at least pulled the valve cover or oil pan to see what's up. A sludged motor is not always repairable, but, depending on how bad it has gotten, total replacement may not be needed. Sludge blocks the oil passages, and prevents oil getting to the places it is needed. One sign this is happening is the oil light. And the oil level may appear normal.
Limp home is probably a separate issue. The throttle in your car is normally a "drive-by-wire" system. Your action on the pedal is NOT directly connected to the throttle opening. This lets Trionic do things like open the throttle plate more than the amount you actually requested because you pressed it down rapidly.
Limp Home refers to the throttle body reverting to the backup system of a cable directly opening the throttle from your foot action. This is usually associated with a failed throttle body. A mechanic familiar with Saabs needs to look at the car and fix the problem, and then can reset the limp home mode. I'm not sure that a simple "clearing of codes" by a generic code scanner is enough to reset the limp home.
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