Means there may be a problem with stability management.
There can be a number of problems ie an electrical fault maybe a sensor problem
or the codes need erasing,
Could mean you need new break pads or a clean of break sensors.
Or worst case scenario is you have a computer fault which is unlikely.
Use the recommended ampere of battery. I have seen cars that have computer failure from the wrong battery. Use the porsche battery or Bosch one which is the same.
I dont really understand. If there was a leak you would see it. If you do a general inspection under neath the car. Best put it up on some jacks and have a look with a torch. What sort of leak are you looking for.
Some people are afraid of do it your self as may not have time or effort to do it the way it should be done. With the price of 944 at the moment i would be doing repairs myself too.
Would be looking at around 3500 dhs. Depending on what you need doing to your car. If just sparks,oil and filters then i would guess that is a fair price with genuine parts. However what maintenance needs doing on the car you buy is another question dependent on the age mileage and wear and tear.