Mercedes W221 Hood Bonnet Lock Right O/S Catch Latch Switch Sensor A2218210051

Mercedes W221 Hood Bonnet Lock Right O/S Catch Latch Switch Sensor is a precision component of the front body security system, responsible for the proper monitoring of the hood position. Thanks to its factory design intended for the W221 series, it ensures proper cooperation with the vehicle's electronics and stable mounting in the original points. This solution allows for restoring the correct operation of the hood system without interfering with the wiring.

Specifications and technical data

• SKU: A2218210051
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2218210051
• Substitutable numbers: A2218210051, A 221 821 00 51
• Location on the vehicle: Right
• Category: Hinges, Latches & Additional Bonnet Components

Purpose and function of the component

The described hood lock with sensor is part of the system responsible for monitoring the closure of the front hood in models from the W221 family. The component is mounted on the right side of the vehicle and works with the factory locks and electrical installation, transmitting the hood status signal to the body control modules.

Such a solution is important for both user comfort and safety – correct reading of the hood position affects the operation of selected vehicle systems, as well as the diagnostics of potential faults in the front end area.

Construction and fitment for Mercedes W221

The lock with sensor has been designed as an element from the Hinges, locks and other hood parts group, which means a perfect fit for the front hood construction in the Mercedes S-Class W221 generation. Installation is carried out at the original mounting points, without the need for bodywork modifications or wiring harness adaptation.

The original origin from the Mercedes parts family promotes maintaining the consistency of the entire hood system – from hinges and locks to sensors and latches. Thanks to this, after replacement, you can achieve stable hood closing and predictable operation of the body systems.

Vehicle placement and installation aspects

The component is intended for installation on the right side of the vehicle, in the front body zone. Such placement requires precise adjustment of the lock and sensor geometry to the hood guides and latches, which ensures proper engagement and position reading.

In practice, the installation comes down to:

• removing covers and unlocking the existing component,
• transferring mounts in accordance with factory points,
• connecting the sensor's electrical connector,
• checking the correctness of the hood closing and the signal in the vehicle's installation.

This approach allows for reducing service time and maintaining the original operating characteristics of the hood system.

Characteristics of the used product

The offered hood lock with sensor is a used part, which in the case of body components often constitutes a reasonable compromise between cost and functionality. The element comes from vehicle dismantling, thanks to which it retains the factory fit to the W221 construction and compatibility with the electrical installation.

Choosing such a solution is particularly beneficial for post-accident repairs, replacing a damaged lock, or restoring full efficiency of the hood system after sensor errors. A used component allows maintaining consistency with other system elements without the need to use replacements with uncertain fitment.

Integration with other Mercedes hood elements

In the case of extensive service work in the front body area, it is worth treating the lock with sensor as part of a larger system. If you are planning a comprehensive repair or upgrade of the hood area in your Mercedes and need other elements from the same group, such as additional locks, guides, or brackets, check the available parts in the Hinges, locks and other hood parts Mercedes category.

Technical support and car project development

For more advanced car modernization projects – especially when you combine body repairs with mechanical modifications or performance improvements – it is worth reaching for proven sources of knowledge. Inspiration can be found in the material dedicated to MINI sports modifications, which discusses the use of components from higher-performance versions; more information can be found in the article MINI John Cooper Works – what makes it stand out and how to improve your MINI?. Although it concerns a different brand, it well illustrates the approach to the conscious selection of used parts when expanding a car.