MOT failure · RFR #40572
A transmission belt, chain, sprocket or pulley excessively loose or worn
Total
1,317
Models
59
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.
Failure match · your reg
Does this failure affect your car?
Enter your reg and we'll check whether your model appears on the affected list — and where it ranks.
Want full MOT history, pass rate, and advisories? Use the reg checker →
Reg saved only in this browser; we never log it server-side. The lookup runs once against the official records each time you submit.
- 01 Lexmoto Lxr 125 SY 125 10 2.29%
- 02 Yamaha Yzf 2.02%
- 03 Yamaha Yzf R125 1.91%
- 04 Yamaha Ybr 125 1.73%
- 05 Honda Glr 1.66%
- 06 Keeway Superlight 1.66%
- 07 Yamaha Ybr 1.64%
- 08 Honda Cbf 125 M B 1.55%
- 09 Yamaha Yzf R125 Abs 1.46%
- 10 Yamaha Ybr125 1.45%
- 11 Yamaha YS 125 1.36%
- 12 Honda Cbf 1.34%
- 13 Yamaha MT 125 Abs 1.29%
- 14 Ktm 125 1.25%
- 15 Yamaha WR 1.02%
- 16 Honda Cbf 125 M M 0.92%
- 17 Yamaha Xj600 0.89%
- 18 Honda Msx 0.72%
- 19 Honda Cg125 0.65%
- 20 Yamaha Dt125 0.60%
- 21 Honda Cbf600 0.59%
- 22 Kawasaki Er6 0.53%
- 23 Honda Cbr 0.47%
- 24 Honda Cb500 0.46%
- 25 Honda Cb600 0.45%
- 26 BMW G310 0.43%
- 27 Kawasaki Zzr600 0.43%
- 28 Kawasaki ER 0.43%
- 29 Suzuki Gsx 0.40%
- 30 Honda Cmx 500 A X 0.38%
Top 30 by rate. 29 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.
Frequently asked.
- Why does a transmission belt, chain, sprocket or… fail an MOT?
- A transmission belt, chain, sprocket or pulley excessively loose or worn. Most commonly flagged on the Lexmoto Lxr 125 SY 125 10. UK 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.
Click Mechanic · affiliate
Book a mobile mechanic
Affiliate links — small commission, no extra cost to you.
Mobile mechanic · UK-wide
Book a mechanic at your door.
Fixed-price quotes upfront. No garage needed. Click Mechanic sends a vetted local mechanic to you — home, work, or roadside.