mechanics.tradeHorn
Testers wrote horn down 109,745 times during 2025, 48th on a list of 265 kinds of defect.
109,745recorded in 2025
0.4%of all recorded defects
48thon the national list
What it is
The horn must work and give a continuous note loud enough to be heard. Two-tone horns that alternate are not allowed on cars first used from August 1973.
What the tester can write down
| Wording on the certificate | Category | Recorded in 2025 |
|---|---|---|
| Audible warning inoperative | Major | 104,189 |
What you can do about it
It is quick to check and costs nothing to try. Where it has stopped working the cause is often the switch in the steering wheel rather than the horn itself, which is worth mentioning to the garage.
Nearby on the list
Every defect on the list, from 42,728,066 MOT tests in 2025.