| Most common failures | No# failures |
|---|
| Registration plate lamp issues | 632 |
| Headlamp aim out of alignment | 370 |
| Windscreen wiper does not clear the windscreen effectively | 307 |
| Brake pipe excessively corroded | 249 |
| Exhaust emits an excessive level of metered smoke for a turbo charged engine |7.4.B.3b| | 142 |
| Offside Front position lamp|s| not working |1.1.A.3b| | 102 |
| Offside Headlamp aim beam image obviously incorrect |1.8.A.1b| | 100 |
| Nearside Front position lamp|s| not working |1.1.A.3b| | 95 |
| Front brake disc in such a condition that it is seriously weakened | 91 |
| Brakes imbalanced across an axle | 80 |
| Supplementary Restraint System warning lamp indicates a fault |5.4.2| | 77 |
| Offside Stop lamp not working |1.2.1b| | 72 |
| Nearside Stop lamp not working |1.2.1b| | 68 |
| Rear brake binding | 61 |
| Nearside Headlamp aim beam image obviously incorrect |1.8.A.1b| | 50 |
| Nearside Front Position lamp not working (4.2.1 (a) (ii)) | 42 |
| Offside Headlamp aim projected beam image is obviously incorrect (4.1.2 (c)) | 40 |
| Offside Front Front position lamp|s| not working |1.1.A.3b| | 39 |
| Offside Rear Service brake excessively binding (1.2.1 (f)) | 38 |
| Parking brake: efficiency below requirements |3.7.B.7| | 37 |
| Offside Front Headlamp aim projected beam image is obviously incorrect (4.1.2 (c)) | 37 |
| Nearside Headlamp aim projected beam image is obviously incorrect (4.1.2 (c)) | 35 |
| Fuel system component leaking |7.2.3| | 35 |
| Nearside Rear Service brake excessively binding (1.2.1 (f)) | 34 |
| Nearside Front Front position lamp|s| not working |1.1.A.3b| | 33 |
| Offside Front Position lamp not working (4.2.1 (a) (ii)) | 32 |
| Nearside Front Headlamp aim projected beam image is obviously incorrect (4.1.2 (c)) | 32 |
| Offside Headlamp not working on dipped beam |1.7.5a| | 31 |
| Offside Front Headlamp aim beam image obviously incorrect |1.8.A.1b| | 30 |
| Supplementary restraint system warning lamp indicates a fault (7.1.6 (a)) | 30 |
| Registration plate issues | 30 |
| Rear Exhaust system not adequately supported |7.1.1| | 29 |
| Parking brake efficiency below requirements (1.4.2 (a) (i)) | 28 |
| Nearside Rear Stop lamp not working |1.2.1b| | 27 |
| Hazard warning switch inoperative (4.4.2 (a) (ii)) | 26 |
| Offside Front Position lamp not working |4.2.1 |a|| | 23 |
| Exhaust system not adequately supported |7.1.1| | 22 |
| Hazard warning switch faulty |1.4.B.1d| | 21 |
| Nearside Headlamp not working on dipped beam |1.7.5a| | 21 |
| Rear parking brake recording little or no effort | 21 |
| Nearside Front Position lamp not working |4.2.1 |a|| | 20 |
| Offside Rear Stop lamp not working |1.2.1b| | 20 |
| Front brake excessively fluctuating | 20 |
| Front brake application uneven | 19 |
| Anti-lock braking system warning lamp indicates an ABS fault | 17 |
| Offside Rear Service brake excessively binding |1.2.1 |f|| | 16 |
| Nearside Rear wheel bearing rough when rotated |2.6.1| | 16 |
| Nearside Front Headlamp aim beam image obviously incorrect |1.8.A.1b| | 16 |
| Exhaust emissions exceed level of metered smoke for a turbo charged engine |8.2.2.2 |b|| | 16 |
| Offside Headlamp aim projected beam image is obviously incorrect |4.1.2 |c|| | 16 |
| Nearside Front Headlamp not working on dipped beam |1.7.5a| | 16 |
| Windscreen washer not working | 16 |
| Horn not working |1.6.2a| | 15 |
| Offside Stop lamp(s) not working (4.3.1 (a) (ii)) | 14 |
| Exhaust emits excessive smoke or vapour of any colour |7.4.B.4| | 13 |
| Front Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 13 |
| Supplementary restraint system warning lamp indicates a fault |7.1.6 |a|| | 13 |
| Exhaust emissions exceed manufacturer`s specified limit |8.2.2.2 |a|| | 12 |
| Hazard warning switch inoperative |4.4.2 |a| |ii|| | 12 |
| Offside Rear Stop lamp(s) not working (4.3.1 (a) (ii)) | 12 |
| Exhaust emissions exceed manufacturers specified limit (8.2.2.2 (a)) | 12 |
| Offside Headlamp aim so that beam "kick up" is not visible on the screen |4.1.2 |a|| | 12 |
| Windscreen has a sticker or other obstruction encroaching into the swept area by more than 40mm outside zone `A` |8.3.1e| | 12 |
| Rear Exhaust system insecure (6.1.2 (a)) | 12 |
| Offside Headlamp lens seriously defective (4.1.1 (b) (ii)) | 12 |
| Engine MIL inoperative or indicates a malfunction (8.2.1.2 (h)) | 12 |
| Offside Headlamp aim aimed so that it dazzles other road users |1.8.A.1a| | 11 |
| Parking brake lever has no reserve travel |3.1.6b| | 11 |
| Nearside Headlamp lens seriously defective (4.1.1 (b) (ii)) | 11 |
| Hazard warning lamps inoperative |1.4.B.1b| | 11 |
| Offside Headlamp excessively deteriorated so that the light output is severely reduced |1.7.5a| | 11 |
| Exhaust emits an excessive level of metered smoke for a non-turbo charged engine |7.4.B.3b| | 11 |
| All direction indicators not working (4.4.1 (a) (ii)) | 11 |
| Offside Front Headlamp not working on dipped beam |1.7.5a| | 11 |
| Nearside Headlamp insecure |1.7.3| | 11 |
| Nearside Front Road wheel bead rim badly distorted |4.2.A.1a| | 11 |
| Offside Rear wheel bearing rough when rotated |2.6.1| | 10 |
| Offside Front Headlamp has a product on the lens so that the light output is severely reduced (4.1.4 (b)) | 10 |
| Exhaust emissions test not completed because smoke levels are significantly in excess of the specified limit values (8.2.2.2 (f)) | 10 |
| Nearside Headlamp aim projected beam image is obviously incorrect |4.1.2 |c|| | 10 |
| Engine MIL inoperative or indicates a malfunction (8.2.2.2 (g)) | 10 |
| Nearside Rear Service brake excessively binding |1.2.1 |f|| | 10 |
| Windscreen wiper blade insecure | 10 |
| Engine MIL inoperative or indicates a malfunction |8.2.1.2 |h|| | 9 |
| Nearside Stop lamp(s) not working (4.3.1 (a) (ii)) | 9 |
| Nearside Headlamp excessively deteriorated so that the light output is severely reduced |1.7.5a| | 9 |
| Rear Exhaust system insecure |6.1.2 |a|| | 9 |
| Nearside Front Headlamp has a product on the lens so that the light output is severely reduced (4.1.4 (b)) | 9 |
| Offside Rear position lamp|s| not working |1.1.A.3b| | 9 |
| Nearside Rear Stop lamp(s) not working (4.3.1 (a) (ii)) | 9 |
| Exhaust emissions exceed level of metered smoke for a turbo charged engine (8.2.2.2 (b)) | 9 |
| Offside Rear fog lamp not working |1.3.2b| | 9 |
| Nearside Rear Wheel bearing rough when rotated (5.1.3 (b) (i)) | 9 |
| Hazard warning lamps inoperative (4.4.1 (e)) | 9 |
| Windscreen has damage | 9 |
| Rear fog lamp not working |1.3.2b| | 8 |
| Offside Stop lamp|s| not working |4.3.1 |a| |ii|| | 8 |
| Nearside Front wheel bearing rough when rotated |2.5.A.2| | 8 |
| Direction indicators not working |1.4.A.2c| | 8 |
| Battery insecure |1.9.1| | 8 |
| Offside Rear Stop lamp|s| not working |4.3.1 |a| |ii|| | 8 |
| Nearside Headlamp aim so that beam "kick up" is not visible on the screen |4.1.2 |a|| | 8 |
| Parking brake efficiency below requirements |1.4.2 |a| |i|| | 8 |
| Nearside Rear Position lamp showing white light to the rear (4.2.3 (a) (ii)) | 8 |
| Offside Front Headlamp aim projected beam image is obviously incorrect |4.1.2 |c|| | 8 |