| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 612 |
| Windscreen wiper does not clear the windscreen effectively | 608 |
| Registration plate lamp issues | 369 |
| Exhaust emits an excessive level of metered smoke |7.4.B.3a| | 122 |
| Offside Front Position lamp not working (4.2.1 (a) (ii)) | 104 |
| Nearside Front Position lamp not working (4.2.1 (a) (ii)) | 98 |
| Offside Rear Direction indicator incorrect colour |1.4.A.2f| | 91 |
| Nearside Rear Direction indicator incorrect colour |1.4.A.2f| | 86 |
| Brake pipe excessively corroded | 78 |
| Nearside Front position lamp|s| not working |1.1.A.3b| | 74 |
| Offside Front position lamp|s| not working |1.1.A.3b| | 70 |
| Registration plate issues | 66 |
| Nearside Stop lamp not working |1.2.1b| | 64 |
| Exhaust emissions exceed manufacturers specified limit (8.2.2.2 (a)) | 59 |
| Parking brake lever has no reserve travel |3.1.6b| | 52 |
| Brakes imbalanced across an axle | 45 |
| Nearside Rear Direction indicator incorrect colour (4.4.3 (a)) | 42 |
| Offside Front Position lamp not working |4.2.1 |a|| | 40 |
| Offside Stop lamp not working |1.2.1b| | 38 |
| Exhaust emissions exceed default limit of 1.5m-1 (8.2.2.2 (b)) | 36 |
| Offside Rear Direction indicator incorrect colour (4.4.3 (a)) | 35 |
| Nearside Front Front position lamp|s| not working |1.1.A.3b| | 35 |
| Offside Front Front position lamp|s| not working |1.1.A.3b| | 31 |
| Front brake disc in such a condition that it is seriously weakened | 30 |
| Nearside Rear Stop lamp(s) not working (4.3.1 (a) (ii)) | 28 |
| Nearside Front Position lamp not working |4.2.1 |a|| | 28 |
| Nearside Stop lamp(s) not working (4.3.1 (a) (ii)) | 27 |
| Parking brake: efficiency below requirements |3.7.B.7| | 26 |
| Exhaust emissions test not completed because smoke levels are significantly in excess of the specified limit values (8.2.2.2 (f)) | 25 |
| Windscreen washer not working | 22 |
| Nearside Rear Stop lamp not working |1.2.1b| | 22 |
| Parking brake efficiency below requirements (1.4.2 (a) (i)) | 22 |
| Exhaust emits an excessive level of metered smoke for a turbo charged engine |7.4.B.3b| | 22 |
| Parking brake lever has excessive movement indicating incorrect adjustment (1.1.6 (c)) | 21 |
| Nearside Headlamp not working on dipped beam |1.7.5a| | 20 |
| Offside Rear Stop lamp(s) not working (4.3.1 (a) (ii)) | 20 |
| Offside Front Shock absorber has a serious fluid leak |2.7.3| | 19 |
| Nearside Front Shock absorbers has a serious fluid leak | 19 |
| Exhaust emits excessive smoke or vapour of any colour |7.4.B.4| | 19 |
| Nearside Stop lamp|s| not working |4.3.1 |a| |ii|| | 18 |
| Exhaust emissions exceed manufacturer`s specified limit |8.2.2.2 |a|| | 18 |
| Nearside Rear Direction indicator incorrect colour |4.4.3 |a|| | 17 |
| Nearside Rear position lamp|s| not working |1.1.A.3b| | 17 |
| Fuel tank leaking (6.1.3 (b) (i)) | 17 |
| Offside Rear Stop lamp not working |1.2.1b| | 17 |
| Nearside Front Shock absorber has a serious fluid leak |2.7.3| | 16 |
| Offside Stop lamp(s) not working (4.3.1 (a) (ii)) | 16 |
| Nearside Rear Stop lamp|s| not working |4.3.1 |a| |ii|| | 16 |
| Offside Front Shock absorbers has a serious fluid leak | 15 |
| Windscreen has damage | 15 |
| Offside Headlamp aim beam image obviously incorrect |1.8.A.1b| | 15 |
| Offside Rear position lamp|s| not working |1.1.A.3b| | 14 |
| Exhaust emissions exceed default limit of 1.5m-1 |8.2.2.2 |b|| | 14 |
| Horn not working |1.6.2a| | 13 |
| Nearside Rear Position lamp not working (4.2.1 (a) (ii)) | 13 |
| Front brake application uneven | 13 |
| Offside Rear Stop lamp|s| not working |4.3.1 |a| |ii|| | 13 |
| Nearside Headlamp aim beam image obviously incorrect |1.8.A.1b| | 12 |
| Nearside Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 12 |
| Parking brake efficiency below requirements |1.4.2 |a| |i|| | 12 |
| Nearside Rear Direction indicators incorrect colour |1.4.A.2f| | 11 |
| Offside Headlamp not working on dipped beam |1.7.5a| | 10 |
| Windscreen wiper blade insecure | 10 |
| Offside Rear Direction indicator incorrect colour |4.4.3 |a|| | 10 |
| Offside Stop lamp|s| not working |4.3.1 |a| |ii|| | 10 |
| Brake lever has insufficient reserve travel (1.1.2 (a)) | 10 |
| Rear brake disc in such a condition that it is seriously weakened | 10 |
| Exhaust on a vehicle fitted with a diesel particulate filter emits visible smoke of any colour (8.2.2.2 (d)) | 9 |
| Parking brake efficiency less than 50% of the required value (1.4.2 (a) (ii)) | 9 |
| Exhaust emits excessive smoke or vapour likely to obscure the vision of other road users (8.2.2.2 (c)) | 9 |
| Windscreen has a sticker or other obstruction encroaching into the swept area by more than 40mm outside zone `A` |8.3.1e| | 9 |
| Offside Obligatory mirror seriously damaged, affecting the rear view |8.1.2a| | 9 |
| Offside Front Headlamp not working on dipped beam |1.7.5a| | 9 |
| Nearside Front Headlamp aim beam image obviously incorrect |1.8.A.1b| | 9 |