Whats the problem with you car, most faults that occur on you car are stored in any one of the many computers your vehicle has, get the dealer to connect up the Clip and carry out a test of all computers, most of the time if a fault has occured the clip will show it as a stored fault or a permanet fault.
You do get the odd occasion when you have a fault thats intermittant, nine times out of ten it does not show itself when at the dealer and nothing is stored on the computers.
Be a bit understanding how can anyone find a fault when its not there, you need to provide as much information as possible to help the technician to fix you car.
When does it happen?
Where does it happen?
Are you the only driver of this car? (The car learns the way you drive!)
Does it happen hot or cold?(Its no good driving it to the dealer and not leaving it overnight if it only happens when cold!)
What Speeds does it happen?
What petrol station do you use?(Quality of fuel makes a big difference)
The list goes on but help the dealer to help you.
Let them have it for a couple of days if its a running fault.
You say its a power fault, what do you mean, does the car lack pull ?
Let me know I will try to help PM me.
