| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 323 |
| Registration plate issues | 198 |
| Registration plate lamp issues | 162 |
| Windscreen wiper does not clear the windscreen effectively | 143 |
| Parking brake: efficiency below requirements |3.7.B.7| | 75 |
| Nearside Front position lamp|s| not working |1.1.A.3b| | 68 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 68 |
| Nearside Steering rack gaiter split |2.2.D.2d| | 64 |
| Rear reflector on motorcycle missing |1.4.1| | 63 |
| Nearside Stop lamp not working |1.2.1b| | 62 |
| Offside Rear fog lamp not working |1.3.2b| | 60 |
| Exhaust emissions carbon monoxide content after 2nd fast idle excessive |7.3.D.3| | 59 |
| Brake pipe excessively corroded | 59 |
| Headlamp aim beam image kick up to the offside |1.6| | 58 |
| Offside Front position lamp|s| not working |1.1.A.3b| | 57 |
| Offside Steering rack gaiter split |2.2.D.2d| | 56 |
| Exhaust emissions Lambda reading after 2nd fast idle outside specified limits |7.3.D.3| | 49 |
| Brakes imbalanced across an axle | 47 |
| Offside Stop lamp not working |1.2.1b| | 46 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 44 |
| Nearside Front constant velocity joint gaiter split |2.5.C.1a| | 43 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 42 |
| Rear parking brake recording little or no effort | 42 |
| Offside Front Steering rack gaiter split |2.2.D.2d| | 39 |
| Front wheel bearings have excessive free play |2.3.5b| | 39 |
| Offside Front constant velocity joint gaiter split |2.5.C.1a| | 37 |
| Nearside Front Front constant velocity joint gaiter split |2.5.C.1a| | 36 |
| Service brake: efficiency below requirements |3.7.B.7| | 35 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 34 |
| Parking brake lever has no reserve travel |3.1.6b| | 33 |
| Nearside Front Steering rack gaiter split |2.2.D.2d| | 33 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 32 |
| Rear fog lamp tell tale not working |1.3.1b| | 30 |
| Offside Headlamp not working on dipped beam |1.7.5a| | 29 |
| Drive chain excessively loose |6.2.1d| | 29 |
| Offside Rear fog lamp missing |1.3.2a| | 28 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 28 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 28 |
| Exhaust emissions carbon monoxide content at idle excessive |7.3.D.4| | 27 |
| Rear fog lamp not working |1.3.2b| | 27 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 27 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 25 |
| Offside Rear Trailing arm rubber bush deteriorated resulting in excessive movement |2.4.G.2| | 24 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 24 |
| Anti-lock braking system warning lamp indicates an ABS fault | 24 |
| Nearside Front Front position lamp|s| not working |1.1.A.3b| | 24 |
| Offside Front Front constant velocity joint gaiter split |2.5.C.1a| | 23 |
| Rear fog lamp switch missing |1.3.1a| | 23 |
| Offside Rear Stop lamp not working |1.2.1b| | 23 |
| Exhaust has a major leak of exhaust gases |7.1.2| | 23 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 23 |
| Throttle operating incorrectly |6.2.1f| | 23 |
| Offside Front Front position lamp|s| not working |1.1.A.3b| | 22 |
| Nearside Rear Trailing arm rubber bush deteriorated resulting in excessive movement |2.4.G.2| | 21 |
| Horn not working |1.6.2a| | 21 |
| Horn not working |1.7.3a| | 21 |
| Offside Rear fog lamp emits a light other than red |1.3.2e| | 21 |
| Drive chain worn to excess |6.2.1e| | 21 |
| Steering headbearing has excessive free play |2.2.2| | 21 |
| Exhaust noise is clearly in excess of that emitted by a similar motor bicycle fitted with a standard silencer in average condition |7.1.2| | 21 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 21 |
| Exhaust emissions hydrocarbon content after 2nd fast idle excessive |7.3.D.3| | 20 |
| Rear brake binding | 20 |
| Offside Headlamp not in good working order adversely affecting beam image |1.2.4a| | 19 |
| Nearside Rear Stop lamp not working |1.2.1b| | 19 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 19 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 19 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 19 |
| Rear Exhaust has a major leak of exhaust gases |7.1.2| | 18 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 18 |
| Offside Rear Rear fog lamp not working |1.3.2b| | 18 |
| Front wheel bearings are excessively rough |2.3.5b| | 18 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 18 |
| Nearside Headlamp not working on dipped beam |1.7.5a| | 17 |
| Emissions not tested |7.0| | 17 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 17 |
| Offside Front Track rod end ball joint has excessive play |2.2.B.1f| | 15 |
| Windscreen wiper blade insecure | 14 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 14 |
| Windscreen has damage | 14 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 14 |
| Front Headlamp aim beam image kick up to the offside |1.6| | 14 |
| Nearside Rear Direction indicator incorrect colour |1.4.A.2f| | 13 |
| Nearside Headlamp not working on main beam |1.7.5a| | 13 |
| Rear Rear fog lamp not working |1.3.2b| | 13 |
| Windscreen has a sticker or other obstruction encroaching into the swept area by more than 40mm outside zone `A` |8.3.1e| | 13 |
| Offside Rear Direction indicator incorrect colour |1.4.A.2f| | 13 |
| Rear Brake disc|s| cracked |3.2.A1g| | 13 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 13 |
| Front Exhaust has a major leak of exhaust gases |7.1.2| | 12 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 12 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 12 |
| Centre Exhaust has a major leak of exhaust gases |7.1.2| | 11 |
| Offside Headlamp aim beam image obviously incorrect |1.8.A.1b| | 11 |
| Offside Headlamp not working on main beam |1.7.5a| | 11 |
| Nearside Headlamp not in good working order adversely affecting beam image |1.2.4a| | 11 |
| Nearside Front Track rod end ball joint has excessive play |2.2.B.1f| | 11 |
| Drive chain excessively tight |6.2.1d| | 11 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 11 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 11 |
| Centre Stop lamp not working |1.2.1b| | 11 |
| Nearside Front position lamp|s| incorrect colour |1.1.A.3e| | 10 |
| Offside Front position lamp|s| incorrect colour |1.1.A.3e| | 10 |
| Rear fog lamp missing |1.3.2a| | 10 |
| Battery insecure |1.9.1| | 10 |
| Supplementary Restraint System warning lamp indicates a fault |5.4.2| | 10 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 10 |
| Offside Rear Direction indicator not working |1.5.1c| | 10 |
| Stop lamp not working |1.2.1b| | 10 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 10 |
| Headlamp aim beam image kick-up is to the offside |1.6.1| | 9 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 9 |
| Nearside Headlamp aim beam image obviously incorrect |1.8.A.1b| | 9 |
| Nearside Track rod end ball joint has excessive play |2.2.B.1f| | 9 |
| Nearside Front Headlamp not working on dipped beam |1.7.5a| | 9 |
| Offside rear brake recording little or no effort |3.7.B.5a| | 9 |
| Nearside Front Upper Suspension arm has excessive play in a ball joint |2.4.G.2| | 9 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 9 |
| Rear Drive chain excessively loose |6.2.1d| | 9 |
| Offside Front Footrest insecure |6.2.1a| | 9 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 9 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 9 |
| Rear Rear fog lamp missing |1.3.2a| | 8 |
| Rear fog lamp emits a light other than red |1.3.2e| | 8 |
| Front brake application uneven | 8 |
| Offside Track rod end ball joint has excessive play |2.2.B.1f| | 8 |
| Nearside Rear Suspension arm rubber bush deteriorated resulting in excessive movement |2.4.G.2| | 8 |
| Offside Rear Rear fog lamp emits a light other than red |1.3.2e| | 8 |
| Offside Headlamp aim aimed so that it dazzles other road users |1.8.A.1a| | 8 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 8 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 8 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 8 |
| Front Wheel spoke excessively loose |4.2.1b| | 8 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 8 |
| Offside Front Upper Suspension arm has excessive play in a ball joint |2.4.G.2| | 8 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 8 |