Mercedes W213 C238 Horn Signal Alarm Siren 420Hz Low Tone Right N/S A2135424300

Mercedes W213 C238 Horn Signal Alarm Siren 420Hz Low Tone Right N/S is an original warning system component, designed specifically for E-Class and E-Class Coupé models. Thanks to its precise tuning to the 420 Hz (low tone) frequency, it provides a clear, characteristic sound that supports both the horn function and the vehicle's alarm system.

Specifications and technical data

• SKU: A2135424300
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2135424300
• Substitutable numbers: A2135424300, A 213 542 43 00
• Location on the vehicle: Right
• Category: Horns

Purpose and function in the vehicle

The presented horn is designed for installation on the right side of the vehicle within the sound signal and alarm system. In Mercedes E-Class W213 and C238 generation cars, a low and high tone system is used – this component is responsible for the 420 Hz low tone, which, when combined with the second horn, creates a full, well-audible sound.

As a factory Mercedes component, the horn works with the vehicle's electrical installation and alarm system without the need for wiring modifications or additional adapters. Proper fitment to the specific mounting side reduces the risk of vibrations and unwanted resonances, contributing to stable operation over a long service life.

Construction and acoustic parameters

The acoustic system of the horn has been tuned to achieve a low, clear tone at a frequency of 420 Hz. This type of sound characteristic:

• increases signal clarity in urban traffic,
• makes it easier to distinguish the vehicle's signal from background noise,
• supports the effectiveness of the factory alarm.

The horn housing is prepared for operation in a compartment exposed to moisture, dirt, and temperature changes, which is crucial for the reliability of the warning system. Using an original component allows for maintaining acoustic consistency with the vehicle's factory configuration.

Installation on the right side of the vehicle

The element is intended for installation on the right side of the vehicle, which is important for both correct sound distribution and fitting to factory mounting points. Proper placement:

• facilitates connection to the existing electrical wiring,
• ensures adequate protection against external factors,
• limits the transmission of vibrations to body components.

Thanks to this, the horn replacement can be carried out in an orderly manner, maintaining factory assembly standards.

Performance characteristics and condition

The offered horn comes from the Mercedes Horns group and is a used item, which allows for an economical replacement while maintaining the manufacturer's original specifications. Choosing an OEM component from the same series as the factory-installed one minimizes the risk of electrical or acoustic incompatibility, often encountered with aftermarket parts of inconsistent parameters.

In practice, this means the ability to restore full functionality of the horn and alarm without interfering with the vehicle's installation, while maintaining the consistent operating character of the entire warning system.

Expanding the signal system and technical knowledge

If you are planning a comprehensive repair or upgrade of the signal system area in your Mercedes and need other elements from the same group, such as high-tone signals, additional sirens, or control modules, check the available parts in the Mercedes Horns category.

When planning broader service work, especially before the winter season, it is worth considering other electrical components and parts exposed to moisture and low temperatures – practical tips, checklists, and a discussion of used parts can be found in the article Winter essentials: which used car parts are worth checking and replacing before the frost?.