How much does a failed MOT test cost?

The cost of a re-test may be free if your vehicle remains on the garage premises until repairs are made. Otherwise it’s likely to be the full cost that the garage charges for MOT testing. This, however, is not the full cost of a failed MOT test as you often need to pay for repairs in the areas that failed the MOT in the first place. This can vary greatly depending on what was at fault.