The standard MGF and TF horn is a conventional electromagnetic unit mounted in the front of the car. The horn is operated by the horn push on the steering wheel through the clock spring and horn relay. Horn failure is usually caused by a corroded horn unit, a failed relay, or a faulty clock spring connection.
Replacement standard horns restore the original sound level and tone. Aftermarket alternatives include compact air horns for a more authoritative sound and dual-tone replacement horns that provide a louder, more European-sounding note than the standard single horn.
Horn System
The horns section covers both the standard replacement horns and the upgrade options available for the MGF and TF. The standard system uses twin horns (high and low note) for a fuller sound. The sub-sections cover Replacement Horns (direct-replacement standard items) and Air Horns (aftermarket upgrade for a more authoritative sound). Horn failure is commonly caused by corrosion on the horn body or electrical connections rather than mechanical failure of the horn diaphragm, a corroded ground connection is the most frequent cause of weak or intermittent horn operation.
Legal Requirements
A functioning horn is an MOT requirement. The horn must produce a continuous, uniform note that is audible to other road users. Twin-horn systems that have lost one horn will still produce a sound but at reduced volume and a thinner tone that may be considered insufficient. When diagnosing horn problems, check the fuse, relay, and horn push contacts before replacing the horn units themselves, the fault often lies in the electrical circuit rather than the horns.