| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 152 |
| Registration plate issues | 78 |
| Registration plate lamp issues | 50 |
| Windscreen wiper does not clear the windscreen effectively | 46 |
| Rear reflector on motorcycle missing |1.4.1| | 35 |
| Steering headbearing has excessive free play |2.2.2| | 26 |
| Parking brake: efficiency below requirements |3.7.B.7| | 25 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 24 |
| Drive chain excessively loose |6.2.1d| | 22 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 22 |
| Brake pipe excessively corroded | 21 |
| Headlamp aim beam image kick up to the offside |1.6| | 20 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 20 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 19 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 18 |
| Offside Rear fog lamp not working |1.3.2b| | 17 |
| Horn not working |1.7.3a| | 17 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 16 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 16 |
| Rear parking brake recording little or no effort | 15 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 15 |
| Nearside Front position lamp|s| not working |1.1.A.3b| | 14 |
| Exhaust emissions carbon monoxide content after 2nd fast idle excessive |7.3.D.3| | 14 |
| Drive chain worn to excess |6.2.1e| | 13 |
| Offside Stop lamp not working |1.2.1b| | 13 |
| Offside Front position lamp|s| not working |1.1.A.3b| | 13 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 13 |
| Nearside Stop lamp not working |1.2.1b| | 11 |
| Front wheel bearings have excessive free play |2.3.5b| | 11 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 11 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 11 |
| Offside Headlamp not working on dipped beam |1.7.5a| | 10 |
| Exhaust emissions carbon monoxide content at idle excessive |7.3.D.4| | 10 |
| Exhaust emissions Lambda reading after 2nd fast idle outside specified limits |7.3.D.3| | 10 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 10 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 10 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 10 |
| Nearside Headlamp not working on dipped beam |1.7.5a| | 9 |
| Offside Front Upper Suspension arm has excessive play in a ball joint |2.4.G.2| | 9 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 9 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 9 |
| Throttle operating incorrectly |6.2.1f| | 8 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 8 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 8 |
| Offside Steering rack gaiter split |2.2.D.2d| | 8 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 8 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 7 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 7 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 7 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 7 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Brakes imbalanced across an axle | 7 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 7 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 6 |
| Rear fog lamp tell tale not working |1.3.1b| | 6 |
| 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| | 6 |
| Nearside Front Upper Suspension arm has excessive play in a ball joint |2.4.G.2| | 6 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 6 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 6 |
| Direction indicators not working |1.5.1c| | 6 |
| Front Headlamp aim beam image kick up to the offside |1.6| | 6 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 5 |
| Offside Front Wheel nut|s| missing |4.2.A.1e| | 5 |
| Parking brake: efficiency below requirements |3.7.C.1b| | 5 |
| Nearside Rear Direction indicator incorrect colour |1.4.A.2f| | 5 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 5 |
| Nearside Front Front position lamp|s| not working |1.1.A.3b| | 5 |
| Offside Front Steering rack gaiter split |2.2.D.2d| | 5 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 5 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 4 |
| Offside Rear Rear fog lamp not working |1.3.2b| | 4 |
| Offside Front constant velocity joint gaiter split |2.5.C.1a| | 4 |
| Offside Obligatory mirror seriously damaged, affecting the rear view |8.1.2a| | 4 |
| Rear fog lamp switch missing |1.3.1a| | 4 |
| Nearside Headlamp not working on main beam |1.7.5a| | 4 |
| Headlamp switch faulty |1.2.4| | 4 |
| Offside Rear Direction indicator incorrect colour |1.4.A.2f| | 4 |
| Nearside Rear Stop lamp not working |1.2.1b| | 4 |
| Nearside Rear Anti-roll bar has excessive play in a ball joint |2.4.G.2| | 4 |
| Rear Brake lever has inadequate reserve travel |3.1.3b| | 4 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 4 |
| Offside Front Direction indicator insecure |1.5.3b| | 4 |
| Front Steering headbearing has excessive free play |2.2.2| | 4 |
| Nearside Rear Anti-roll bar linkage has excessive play in a ball joint |2.4.G.2| | 4 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 4 |
| Front mudguard insecure |2.3.7| | 4 |
| Horn missing |1.7.1| | 4 |
| Nearside Rear Direction indicator not working |1.5.1c| | 4 |
| Horn not working (1.7.3a) | 4 |
| Rear reflector missing (4.8.2 (a) (ii)) | 4 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Headlamp insecure |1.2.3b| | 3 |
| Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Nearside Front All position lamps not working |1.1.A.3b| | 3 |
| Nearside Front Anti-roll bar has excessive play in a ball joint |2.4.G.2| | 3 |
| Nearside Headlamp aim beam image obviously incorrect |1.8.A.1b| | 3 |
| Offside Rear Direction indicator insecure |1.5.3b| | 3 |
| Front Exhaust has a major leak of exhaust gases |7.1.2| | 3 |
| Nearside Steering rack gaiter split |2.2.D.2d| | 3 |
| Nearside Headlamp aim so that beam "kick up" is not visible on the screen |4.1.2 |a|| | 3 |
| Nearside Headlamp aim aimed so that it dazzles other road users |1.8.A.1a| | 3 |
| Front brake application uneven | 3 |
| Nearside Headlamp aim not tested |1.8.A.1c| | 3 |
| Offside Front Front position lamp|s| not working |1.1.A.3b| | 3 |
| Nearside Front Windscreen wiper blade deteriorated |8.2.2| | 3 |
| Rear fog lamp not working |1.3.2b| | 3 |
| Offside Front Shock absorber has a serious fluid leak |2.7.3| | 3 |
| Anti-lock braking system warning lamp indicates an ABS fault | 3 |
| Offside Rear Anti-roll bar has excessive play in a ball joint |2.4.G.2| | 3 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Nearside Front Direction indicator incorrect colour |1.5.1b| | 3 |
| Offside Rear Stop lamp not working |1.2.1b| | 3 |
| Nearside Front Wheel nut|s| missing |4.2.A.1e| | 3 |
| Nearside Rear brake disc excessively pitted |3.5.1h| | 3 |
| Exhaust has a major leak of exhaust gases |7.1.2| | 3 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 3 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 3 |
| Nearside Front Direction indicator incorrect colour |1.4.A.2f| | 3 |
| Rear Brake pedal cannot be released smoothly |3.1.3d| | 3 |
| Nearside Front Front suspension has inadequate damping effect. |2.3.6c| | 3 |
| Rear Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 3 |
| An item not tested |Manual| | 3 |
| Nearside Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 3 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Offside Rear Anti-roll bar linkage has excessive play in a ball joint |2.4.G.2| | 3 |
| Offside Front Direction indicator incorrect colour |1.4.A.2f| | 3 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 3 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 3 |
| Brake hose damaged | 3 |
| Fuel system component insecure |7.2.1b| | 3 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 3 |
| Headlamp aim headlamp damaged and function impaired |1.2.3a| | 3 |
| Front wheel bearings are excessively rough |2.3.5b| | 3 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 3 |
| Front Horn not working |1.7.3a| | 3 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Front Direction indicator flashing more than 120 times per minute |1.5.1c| | 3 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Front Position lamp not working (4.2.1 (a)) | 3 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 3 |