Why does a transmission shaft constant velocity joint… fail an MOT?

A transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc. Most commonly flagged on the Mercedes Benz Esprinter Progressive. The DVSA's MOT standards require this item to meet minimum safety thresholds — when it falls short, the tester logs it as a Major or Dangerous defect and the car fails outright.

How much does it cost to fix a transmission shaft constant velocity joint…?

Costs vary depending on the vehicle, region, and severity. Use our MOT cost estimator for typical UK garage rates across the most common failure items.

A transmission shaft constant velocity joint… — MOT failure (393,304 cars, 2023)

Models most at risk.

Ranked by rate, not raw volume. A Fiesta shows every failure a lot because there are a lot of Fiestas. Rate = share of that model's own MOTs.

Top 30 by rate. 332 more models also logged this defect.

Cost orientation

Hard to predict in isolation — depends what's actually worn.

This defect doesn't map to a clean retail-part swap; ranges vary too widely without seeing the car. Use the estimator to bracket the all-in cost across the items most likely to surface alongside it.

Open estimator

Frequently asked.

Why does a transmission shaft constant velocity joint… fail an MOT?: A transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc. Most commonly flagged on the Mercedes Benz Esprinter Progressive. The DVSA's MOT standards require this item to meet minimum safety thresholds — when it falls short, the tester logs it as a Major or Dangerous defect and the car fails outright.
How much does it cost to fix a transmission shaft constant velocity joint…?: Costs vary depending on the vehicle, region, and severity. Use our MOT cost estimator for typical UK garage rates across the most common failure items.