The MOT (Ministry of Transport) test checks the roadworthiness of vehicles over 3 years old in the UK annually. It tests components like the suspension, steering, brakes, lights, seatbelts and emissions. To check a used car's MOT history, you need the license plate number and last certificate to view the test dates, results and mileage online. Cars must pass the MOT to be legally driven, and failures like severe tire damage or large windscreen chips could cause a car to fail inspection. MOT rules govern tire tread depth and condition, with less than 1.6mm or bulges potentially resulting in failure.