Smart C451 Rear Boot Back Door Lock Latch Bottom Mechanism Left N/S A4517400135

Smart C451 Rear Boot Back Door Lock Latch Bottom Mechanism Left is a precision component of the rear body locking system, designed for installation on the left side of the tailgate. The original Smart design ensures proper cooperation with the factory locking mechanism, which translates into secure closing and stable retention of the tailgate in the closed position. This is a practical solution for users who expect efficient tailgate operation and correct lock geometry.

Specifications and technical data

• SKU: A4517400135
• Mark: Smart
• Condition: Used
• OEM Part Number: A4517400135
• Substitutable numbers: A 451 740 01 35, A4517400135, A 451 740 11 00, A4517401100
• Location on the vehicle: Rear, Left
• Part type: Boot Latch
• Category: Lift Supports, Latches, Hinges & Additional Parts

Purpose and vehicle placement

The presented lock mechanism is designed to operate in the rear of the vehicle body, on the left side. Its placement in the tailgate area means it is responsible for the bottom latching, stabilizing the tailgate relative to the body and ensuring proper closure. Such a solution reduces unwanted play, minimizes vibrations while driving, and supports the tightness of the rear part of the vehicle.

Technical and functional characteristics

The tailgate lock in this version works with the factory hinge system, gas struts, and other mounting elements from the Gas struts, locks, hinges, and other parts group. The mechanism's construction is adapted to serial mounting points, which facilitates replacement without the need for body modifications. Properly selected geometry of the catches and guides allows for smooth latching and repeatable, predictable operation during daily use. The element is prepared for operation in typical operating conditions of a city car – frequent opening and closing of the tailgate, temperature changes, and standard loads resulting from the use of the trunk. Thanks to this, it can effectively restore the proper operation of the locking system in a vehicle where the existing lock has suffered mechanical wear or damage.

Benefits of using an original Smart lock

Using an original tailgate lock in the Smart C451 model brings a number of practical benefits:

• preservation of factory fit to the tailgate and body,
• proper cooperation with existing hinges and gas struts,
• stable closing of the tailgate without the need for additional body adjustment,
• reduction of knocks and play in the rear part of the vehicle,
• maintenance of the correct position of the tailgate relative to the seals. For the user, this means more comfortable use of the trunk and a lower risk of problems with the tailgate not closing or opening accidentally. Choosing an original Smart solution also helps maintain the technical consistency of the vehicle, which is important for further operation and potential inspections.

Component condition and service application

The offered lock comes from a group of used parts, which allows for an economical repair of the locking system while maintaining the original design. This type of component is particularly useful in situations where the existing mechanism has suffered mechanical damage, corrosion, or operational wear, and the goal is to restore the proper operation of the tailgate without interfering with the body structure. Replacing the lock with an original counterpart is a preferred solution in services specializing in the Smart brand, as it allows for the maintenance of predictable system operating parameters.

Related components and system expansion

In service practice, replacing the tailgate lock is often combined with checking the condition of hinges, gas struts, and other mounts in this body zone. If you are planning a comprehensive repair or modernization of the tailgate zone in your Smart and need other elements from the same group, such as additional locks, hinges, or support struts, check the available parts in the Gas struts, locks, hinges, and other Smart parts category.

Technical support and part selection

The selection of the correct tailgate lock has a direct impact on the safety of the transported cargo and the comfort of daily vehicle operation. In the case of Daimler group cars, it is worth using specialized knowledge regarding body equipment and elements cooperating with vehicle electronics. Additional information about the manufacturer's approach to component quality and the importance of using proven parts can be found in the article Reliability under the star sign – how to take care of engine accessories in popular Mercedes-Benz C-Class and E-Class models?, which discusses, among other things, the importance of proper selection of consumables in vehicles of this group.