Motor Vehicle Expert
MOT driveline guide

Can CV Boot Fail MOT?

Yes, a CV boot can fail an MOT if it is split, insecure or leaking grease badly enough to expose the joint to dirt or lose lubrication. CV boots protect constant velocity joints on driveshafts.

Quick answer Failure reasons

Quick answer

A split CV boot with grease escaping or contamination entering the joint may fail the MOT.

Catching it early is cheaper than replacing a damaged CV joint later.

Common MOT failure reasons

Split rubber boot

Cracks or tears in the gaiter.

Grease leakage

Visible grease thrown around wheel arch area.

Loose clips

Boot no longer secured correctly.

Contamination risk

Dirt and water entering the joint.

Joint wear signs

Clicks or play from damaged CV joint.

Unsafe condition

Any defect affecting drivetrain safety.

Signs a CV boot may be damaged

  • !Grease on wheel or suspension parts.
  • !Clicking when turning sharply.
  • !Visible split rubber boot.
  • !Vibration under load.
  • !Knocking from driveshaft area.

Should you repair before MOT?

Yes. Replacing a split boot early is usually cheaper than waiting until the CV joint itself wears out.

Once the joint runs dry or gets contaminated, full driveshaft or joint replacement may be needed.

Frequently asked questions

Will a split CV boot fail MOT?

Often yes, especially if leaking or insecure.

Can I just regrease it?

Usually the boot itself needs replacing.

Is clicking related?

Yes, worn CV joints often click on turns.

Is boot repair cheaper than CV joint repair?

Usually much cheaper if caught early.