MOT failure · RFR #40580
A transmission belt, chain, sprocket or pulley so loose or worn it is likely to fail
Total
15
Models
4
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.
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 belt, chain, sprocket or… fail an MOT?
- A transmission belt, chain, sprocket or pulley so loose or worn it is likely to fail. Most commonly flagged on the Sinnis ZS 125 79 Hoodlum. 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 belt, chain, sprocket or…?
- 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.