OK. Unless this was a brand new car when you bought it, the Sale of Goods Act 1979 is unlikely to be of much use. This is because more than 12 months have passed since the date of purchase and you have undoubtedly clocked up some mileage. The garage will simply say that any problems with the car are due to wear and tear. If it is an older car they will argue that this is only to be expected. However, you might have a claim under the Sale of Goods and Services Act 1982 on the basis that the garage has failed to exercise reasonable skill and care in dealing with the problem. What this means that a tradesman or professional has a 'duty of care' towards you and your car. Any standard or price you agree must be honoured. But if it isn't agreed in advance the work must be done to a reasonable standard, at a reasonable cost, and within a reasonable time. If you believe the garage has failed to exercise reasonable skill and care you only need to pay them what you think is a reasonable sum for the work they've done and invite them to sue you for the rest. The danger with this is that they may decide to keep your car as a lien. In which case you'd be better of paying the full amount and then suing the garage for a refund. In order to prove your case you will also need to obtain a report from an engineer or other suitably qualified person to assess whether the garage has done the work properly or not. When you have this information you can then decide whether to take the matter further.