| Most common failures | No# failures |
|---|
| Windscreen wiper does not clear the windscreen effectively | 416 |
| Brakes imbalanced across an axle | 306 |
| Headlamp aim out of alignment | 304 |
| Registration plate lamp issues | 288 |
| Brake pipe excessively corroded | 268 |
| Offside Front Position lamp not working (4.2.1 (a) (ii)) | 136 |
| Exhaust emissions exceed manufacturers specified limit (8.2.2.2 (a)) | 136 |
| Nearside Front Position lamp not working (4.2.1 (a) (ii)) | 134 |
| Exhaust emits an excessive level of metered smoke |7.4.B.3a| | 123 |
| Parking brake efficiency below requirements (1.4.2 (a) (i)) | 119 |
| Rear brake binding | 83 |
| Supplementary restraint system warning lamp indicates a fault (7.1.6 (a)) | 72 |
| Nearside Front position lamp|s| not working |1.1.A.3b| | 59 |
| Anti-lock braking system warning lamp indicates an ABS fault | 59 |
| Offside Rear Service brake excessively binding (1.2.1 (f)) | 58 |
| Windscreen washer not working | 55 |
| Parking brake: efficiency below requirements |3.7.B.7| | 54 |
| Engine MIL inoperative or indicates a malfunction (8.2.2.2 (g)) | 54 |
| Registration plate issues | 49 |
| Offside Stop lamp(s) not working (4.3.1 (a) (ii)) | 46 |
| Parking brake lever has excessive movement indicating incorrect adjustment (1.1.6 (c)) | 44 |
| Nearside Rear Service brake excessively binding (1.2.1 (f)) | 43 |
| Rear brake disc in such a condition that it is seriously weakened | 42 |
| Offside Front position lamp|s| not working |1.1.A.3b| | 41 |
| Offside Rear Stop lamp(s) not working (4.3.1 (a) (ii)) | 41 |
| Front brake application uneven | 39 |
| Exhaust emissions exceed default limit of 1.5m-1 (8.2.2.2 (b)) | 39 |
| Nearside Stop lamp(s) not working (4.3.1 (a) (ii)) | 39 |
| Parking brake efficiency less than 50% of the required value (1.4.2 (a) (ii)) | 33 |
| Brake lever has insufficient reserve travel (1.1.2 (a)) | 32 |
| Nearside Rear Stop lamp(s) not working (4.3.1 (a) (ii)) | 32 |
| Rear brake application uneven | 31 |
| Offside Stop lamp not working |1.2.1b| | 29 |
| Parking brake lever has no reserve travel |3.1.6b| | 29 |
| Exhaust emissions exceed manufacturer`s specified limit |8.2.2.2 |a|| | 29 |
| Nearside Front Anti-roll bar linkage ball joint excessively worn (5.3.4 (a) (i)) | 29 |
| Offside Front Suspension arm ball joint dust cover no longer prevents the ingress of dirt (5.3.4 (b) (ii)) | 29 |
| Rear parking brake recording little or no effort | 28 |
| Engine MIL inoperative or indicates a malfunction (8.2.1.2 (h)) | 26 |
| Offside Front Macpherson strut top bush or bearing has excessive wear or free play (5.3.4 (a) (i)) | 26 |
| Nearside Front Macpherson strut has excessive movement at the upper attachment |2.5.A.1c| | 24 |
| Brake hose excessively deteriorated | 24 |
| Parking brake efficiency below requirements |1.4.2 |a| |i|| | 23 |
| Nearside Front Macpherson strut top bush or bearing has excessive wear or free play (5.3.4 (a) (i)) | 23 |
| Supplementary Restraint System warning lamp indicates a fault |5.4.2| | 22 |
| Offside Parking brake inoperative on one side (1.4.1 (a)) | 22 |
| Offside Rear Parking brake inoperative on one side (1.4.1 (a)) | 22 |
| Nearside Stop lamp not working |1.2.1b| | 20 |
| Electronic stability control warning lamp indicates a fault (7.12 (e)) | 20 |
| Offside Front Lower Suspension arm ball joint dust cover no longer prevents the ingress of dirt (5.3.4 (b) (ii)) | 20 |
| Horn not working (7.7 (a)) | 20 |
| Rear Mechanical brake component has restricted free movement | 19 |
| Front brake disc in such a condition that it is seriously weakened | 19 |
| Nearside Front Lower Suspension arm ball joint dust cover no longer prevents the ingress of dirt (5.3.4 (b) (ii)) | 19 |
| Exhaust emissions test not completed because smoke levels are significantly in excess of the specified limit values (8.2.2.2 (f)) | 19 |
| Parking brake lever has excessive movement indicating incorrect adjustment |1.1.6 |c|| | 18 |
| Nearside Front Front position lamp|s| not working |1.1.A.3b| | 18 |
| Offside Front Front position lamp|s| not working |1.1.A.3b| | 17 |
| Service brake efficiency below requirements (1.2.2 (a) (i)) | 17 |
| Front brake excessively fluctuating | 15 |
| Horn not working |1.6.2a| | 15 |
| Offside Rear Service brake excessively binding |1.2.1 |f|| | 15 |
| Offside Rear Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 15 |
| Offside Rear Service brake excessively fluctuating (1.2.1 (e)) | 15 |
| Nearside Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 15 |
| Nearside Rear Parking brake inoperative on one side (1.4.1 (a)) | 15 |
| Offside Side repeater incorrect colour (4.4.3 (a)) | 15 |
| Offside Front Position lamp not working |4.2.1 |a|| | 14 |
| Offside Front Macpherson strut has excessive movement at the upper attachment |2.5.A.1c| | 14 |
| Horn not working (7.7 (a) (ii)) | 14 |
| Exhaust emissions exceed default limit of 1.5m-1 |8.2.2.2 |b|| | 13 |
| Nearside Front Position lamp not working |4.2.1 |a|| | 13 |
| Offside Front Service brake excessively fluctuating (1.2.1 (e)) | 13 |
| Nearside Rear Stop lamp not working |1.2.1b| | 12 |
| Nearside Rear Service brake excessively binding |1.2.1 |f|| | 12 |
| Nearside Front Suspension arm ball joint excessively worn (5.3.4 (a) (i)) | 12 |
| Nearside Front Suspension arm ball joint dust cover no longer prevents the ingress of dirt (5.3.4 (b) (ii)) | 12 |
| Exhaust emissions exceed manufacturers specified limit 0.74 (8.2.2.2 (a)) | 12 |
| Offside Front Anti-roll bar linkage ball joint excessively worn (5.3.4 (a) (i)) | 12 |
| Exhaust emits excessive smoke or vapour likely to obscure the vision of other road users (8.2.2.2 (c)) | 12 |
| Offside Front Track rod end ball joint has excessive play (2.1.3 (b) (i)) | 12 |
| Offside Rear Stop lamp not working |1.2.1b| | 11 |
| Nearside Stop lamp|s| not working |4.3.1 |a| |ii|| | 11 |
| Horn not working |7.7 |a| |ii|| | 11 |
| Nearside Front Shock absorbers has a serious fluid leak | 11 |
| Nearside Side repeater incorrect colour (4.4.3 (a)) | 11 |
| Nearside Front Service brake excessively binding (1.2.1 (f)) | 11 |
| Offside Front Service brake excessively binding (1.2.1 (f)) | 11 |
| Nearside Headlamp not working on dipped beam |1.7.5a| | 10 |
| Engine MIL inoperative or indicates a malfunction |8.2.2.2 |g|| | 10 |
| Exhaust on a vehicle fitted with a diesel particulate filter emits visible smoke of any colour (8.2.2.2 (d)) | 10 |
| Offside Stop lamp|s| not working |4.3.1 |a| |ii|| | 9 |
| Front Service brake excessively fluctuating (1.2.1 (e)) | 9 |
| Nearside Front Service brake excessively fluctuating (1.2.1 (e)) | 9 |
| Nearside Rear Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 9 |
| Nearside Front Anti-roll bar linkage ball joint dust cover no longer prevents the ingress of dirt (5.3.4 (b) (ii)) | 9 |
| Offside Rear Service brake lagging in operation (1.2.1 (d)) | 9 |
| Offside Rear fog lamp not working (4.5.1 (a) (ii)) | 9 |