I have a 2004 Saab 9-3. Recently I drove out of town about 2 hour drive. Arriving on a speed bump at low speed(10mph) my car jurcked a little and the gearbox malfunction limited performance appeared on my dash. When I accelerated at the moment it seemed to force speed. I then parked turned off the car and turned back on. The same code showed only as I drove the car seemed to run normal. I drove in town for a week with no problem and returned home (2 hour drive) with no problem at 60mph. It’s been a month and car runs fine still, only the same code appears when turning on car. Took to mechanic and the code reads lock-up mechanical fault.. should I be concerned about this.. car seems to run fine. Any help or advice ?

SOURCE: Check Engine light

It sound like you are having a electrical problem.You need to check your electrical/ignition system,not all electrical problem the diagnostic machine can read.

SOURCE: Saab 9-5 Aero Wagon 2000 wont restart when warm or after running

I have a 1999 Saab 9-5. I had a similiar problem. The car would always run cold. It would get hot and the engine would quit. It could be anywhere. One mile from start to 50 miles from start. Once it cooled down it would re-start but the cool down time was always different. Only difference for me was my car would crank, just not run. Replaced the crank position sensor ($60), no more problems! Good luck!

SOURCE: Car Runs and Loses Power and Quits Running

Try cleaning the fuel pump filter. Under the seat behind the driver lift the carpet and you will find a round cover with six screws remove the cover. The fuel pump is directly below unscrew the retaining round plate and remove the pump. At the base of the pump is a small filter if it is covered in black muck that's your problem. clean and replace. job takes about 10 mins good luck. please let me know how you got on!

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SOURCE: 2004 vw Passat TDI 130bhp not starting after >8hrs

simplest answer first,and this does not apply to a hot engine,The engine heaters work from a time switch on the door(would you believe)and the routine is, open door,climb in,put on belt,put key in ignition and turn on when orange light goes out.this allows the cold start heaters time to work(about 20 secs).sounds a pain but the number of times this has been all it is,when you put key in ignition, the fuel pump charges the system.hence the squirt noise,also the car has to reccognise the key(immobiliser system)also try using wynns/redexe to clean injectors...

SOURCE: x type jag, gearbox fault on dash, runs ok

You need to go to your local auto electician,to plug in scanner
This will locate fault before it gets worse