The major change is that defects found are now given one of three categories: Dangerous, Major and Minor.
• Dangerous means – as the name suggests – a very serious problem to safety or the environment. It will result in an instant MOT fail, and indicates that the car should not be driven until the problem has been fixed.
• Major is also a fail, and means the defect may affect safety or the environment and should be repaired immediately.
• Minor means the car will still pass the MOT, as it doesn’t have a significant impact on safety or the environment, but indicates the defect should be repaired as soon as possible.
• Advisory means an issue that could become more serious, and needs keeping an eye on.
• Pass means everything is fine.
There are also changes to the limits on emissions from diesel vehicles fitted with a diesel particulate filter (better known as a DPF). In addition, new checks are being added to the test, including the examination of daytime running lights, front fog lights and visible smoke from cars fitted with a DPF.
You can see the full list of changes on the government website.