A defect in your car does not necessarily mean that your car will fail the MOT. It depends on how serious the problem is. The official MOT Inspection Manual categorises each defect into one of three severity categories:
- Minor: Defects that have no significant impact on the environment or vehicle safety, plus other minor defects
- Major: Defects that may harm the environment, impact the safety of the vehicle, put other road users at risk, plus other more serious defects
- Dangerous: Defects that have a "direct and immediate risk" to road safety or the environment
If the defects found on your car are "minor" then your car will pass, but with an advisory. It's cars with any "major" or "dangerous" defects that fail the MOT. You can see which defects are minor, major and dangerous by checking the list of MOT fail codes. If you know that something is wrong with your car, you can figure out ahead of time if this defect is likely to fail your car or not.
Below we've answered 20 of the most commonly asked questions regarding whether or not specific faults will cause your car to fail its MOT. We also link to further guidance on each specific issue so you can learn more.