If you are concerned about known warranty problems about your car, Technical Service Bulletins (TSB's) are a good place to start and give you amunition when you visit the Dealer for repair. Many people talk about them here on the forums, but few know where to find them.
The TSB that Ford sends it's dealers are available to the public through National Highway Transportation & Safety Adminstration.
These TSB's do not mean there is for certain a problem with your Mustang. It just means that Ford has seen a lot of repairs for this particular problem, so they send a bulletin out to the dealers so they have general direction with warranties.
The ones listed on the NHTS website are brief and the Dealers version may have a great deal more information. None the less, it is a starting point and I thought the link may be useful. It also contains Recalls, Complaints, and Defect investigations.
there is also a thing called ssm- special service messages, i think that its only avalible to dealers and spacific to car vin, i work at a dealer and have access to this at home but wont work on older cars , ie 1998 & older .fyi , thanks big g
When there is a TSB does that mean that they have to fix it at no cost or only if the car is under warranty?
No that is a recall, some TSB's may be fixed under warranty but if the car is out of warranty it's all on you. Sometimes a dealer might work with you if you are a good customer, but most of the time not. TSB's really are exactly what the letters mean, technical service bulletin. They are put out to assist technicians in diagnosis of common problems found in/on cars. They are more of a help aid for us mechanics. They are not a saftey risk, or gauranteed problems (not necessarily defective), and so are not made recalls.