MOT failure · RFR #40573
A transmission belt, chain, sprocket or pulley excessively loose or worn
Total
456
Models
35
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.
- 01 Qingqi QM 1.93%
- 02 Honda Cbf 125 M 9 1.75%
- 03 Lexmoto Zsx 1.73%
- 04 Honda Cbf125 1.51%
- 05 Honda Cbf 125 M A 1.50%
- 06 Ktm RC 1.48%
- 07 Sinnis ZS 125 79 Hoodlum 1.39%
- 08 Lexmoto Michigan 1.30%
- 09 Yamaha MT 125 Abs 1.27%
- 10 Sinnis ZS 125 86 Terrain 1.24%
- 11 Honda Cbf 125 M D 1.20%
- 12 Benelli Tornado Naked T 125 1.18%
- 13 Yamaha Yzf R125 1.12%
- 14 Honda Cbf 125 M B 1.04%
- 15 Ktm 125 Duke 19 1.03%
- 16 Aprilia RS 0.99%
- 17 Honda Glr 0.98%
- 18 Yamaha Ybr 125 0.94%
- 19 Yamaha Ybr 0.94%
- 20 Ktm 250 0.88%
- 21 Honda Cbf 0.84%
- 22 Yamaha YS 125 0.84%
- 23 Yamaha WR 0.80%
- 24 Yamaha XJ 6 S Diversion 0.64%
- 25 Honda CB 500 XA K 0.52%
- 26 Suzuki Vz800 0.52%
- 27 Kawasaki Er6 0.51%
- 28 Suzuki GW 0.38%
- 29 Kawasaki Kle 0.38%
- 30 BMW F850 0.36%
Top 30 by rate. 5 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 belt, chain, sprocket or… fail an MOT?
- A transmission belt, chain, sprocket or pulley excessively loose or worn. Most commonly flagged on the Qingqi QM. 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.