Quick answer
If an exhaust mount is snapped, perished or no longer secures the exhaust correctly, the vehicle may fail the MOT.
Loose exhaust systems can create noise, leaks and safety risks.
Common MOT failure reasons
Broken rubber hanger
Rubber support has torn or detached.
Loose bracket
Metal mounting bracket insecure or missing.
Excessive movement
Exhaust swings or knocks underneath.
Risk of detachment
System may drop or drag.
Related leak
Movement may crack joints and cause leaks.
Unsafe condition
Any defect affecting secure support.
Signs an exhaust mount may be bad
- !Rattling under the car.
- !Knocking on bumps.
- !Loud exhaust suddenly.
- !Tailpipe hanging low.
- !Visible broken rubber hanger.
Should you repair before MOT?
Yes. Exhaust mounts are often inexpensive compared with replacing damaged exhaust sections caused by hanging or movement.
Fixing mounts early may also prevent leaks and unwanted noise.
Related MOT guides
Frequently asked questions
Will one broken hanger fail MOT?
If the exhaust is insecure or unstable, yes.
Are rubber mounts cheap to fix?
Often yes, depending on vehicle design.
Can a loose exhaust become dangerous?
Yes, it can detach or strike the road.
Can mounts cause rattling?
Yes, very commonly.