My car is two and a half years old so has six months of manufacturer's warranty left on it, and I need to take it in to a main dealers for them to have a look at it as there is a noise coming from the front of the car when going over speed bumps. Now if this noise is down to a faulty shock absorber then it isn't repairable under warranty, meaning I won't get it fixed for now as I'll probably replace all of the shocks with better ones. My question is.... what happens if it is the shocks?? Do main dealers charge you a diagnosis fee if they find the fault isn't covered by warranty??