Yes, you can challenge an MOT failure. If you think the fault with your car was caused by something else, such as a manufacturing defect, you can appeal against the result. You will need to provide evidence to support your claim, and the appeal will be decided by an independent adjudicator. They can either agree with the original MOT result or overturn it and declare your car to be safe to drive. So, there you have it – the most common reasons why cars fail their MOT tests. By avoiding these faults and keeping your car well-maintained, you can help ensure that your car passes its MOT with no problems.