Mercedes V251 W251 Horn Signal Fanfare Left N/S 420 Hz A2515420420

Mercedes V251 W251 Horn Signal Fanfare Left N/S 420 Hz is a factory-original signaling system component designed for installation on the left side of the vehicle. Thanks to its precisely tuned 420 Hz frequency, it provides a clear, highly audible warning signal consistent with the acoustic characteristics used in Mercedes vehicles. This is an ideal solution for users who require compatibility with the factory electrical system and stable operating parameters.

Specifications and technical data

• SKU: A2515420420
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2515420420
• Substitutable numbers: A2515420420, A 251 542 04 20
• Location on the vehicle: Left
• Part type: Electric Horn
• Category: Horns

Purpose and function of the horn

The presented horn is designed as a component of the warning system in V251 / W251 series models, with placement on the left side of the vehicle. The 420 Hz frequency is responsible for a clear, high-pitched tone that cuts through ambient noise effectively and is easily recognizable by other road users. As part of the Horns category, this component works with the vehicle's factory electrical system, maintaining the correct volume and sound characteristics. Proper fitment to the Mercedes installation reduces the risk of operational interference and assembly issues.

Construction and acoustic parameters

The horn utilizes a single tone with a frequency of 420 Hz, allowing for a compact, unambiguous warning signal. This type of acoustic characteristic is often used in premium class vehicles, where both effectiveness and sound consistency with other vehicle elements are prioritized. Placement on the left side of the vehicle promotes proper sound propagation towards the front of the car while facilitating service and potential replacement. Using the original design intended for Mercedes ensures correct mounting points and proper wiring routing.

Compatibility and installation

The horn is intended for Mercedes vehicles of the V251 / W251 series, where a left-side 420 Hz horn is specified. Thanks to the preservation of factory geometry and connectors, installation is similar to replacing an OEM part, without the need for any modifications to the electrical system. The left-side placement on the vehicle is important both from an acoustic perspective and for compatibility with brackets and the wiring harness. Proper fitment to the specific mounting position reduces vibration, improving the durability and stability of the horn's operation.

Condition and practical application

The offered item comes from the Horns category and is intended for users who want to restore full functionality to the signaling system in their Mercedes or replace a faulty horn with a component featuring factory-like parameters. This solution is particularly useful for post-accident repairs, renovations, and routine maintenance. Selecting a horn with the correct frequency and proper vehicle placement allows for maintaining the consistency of the entire warning system, which is significant for both safety and compliance with homologation requirements.

Expanding the Mercedes signaling system

If you are planning a comprehensive repair or upgrade of the signaling zone in your Mercedes and need other elements from the same group, such as additional horns, control modules, or mounting brackets, check out the available parts in the Mercedes Horns category. For users interested in deepening their knowledge regarding the selection of used OEM parts, equipment operating characteristics, and the impact of components on driving experience, an article comparing turbochargers in Mini sports designs may be helpful – you can find it here: Go-Kart Feeling XXL – comparison of used N18 and B48 turbochargers.