Mercedes W221 Rear Door Lock Latch Catch Mechanism Left N/S Side A2217307135

Mercedes W221 Rear Door Lock Latch Catch Mechanism Left N/S Side is an original component from the Locks and Latches category, designed for installation in the rear left door of Mercedes S-Class W221 vehicles. This is a solution for users who expect reliable door closing, proper integration with the electrical system, and stable central locking operation in daily use.

Specifications and technical data

• SKU: A2217307135
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2217307135
• Substitutable numbers: A2217307135, A 221 730 71 35, A2217302735, A 221 730 27 35
• Location on the vehicle: Rear, Left
• Part type: Door Lock
• Category: Exterior Locks & Lock Hardware

Purpose and function of the lock mechanism

The presented mechanism is responsible for secure locking and unlocking of the rear left door in the Mercedes W221, both via the central locking system and the interior and exterior door handles. A properly functioning lock eliminates issues with doors not closing, doors opening on their own, or lack of response to the remote control signal.

Its placement in the rear left door area means this component has a direct impact on the comfort of rear passengers and the overall level of safety while driving and when the vehicle is parked.

Construction and fitment for Mercedes W221

The mechanism has been designed specifically for the door structure of the Mercedes S-Class W221 generation, maintaining factory mounting points and the geometry required to work with linkages and handles. As a result:

• it fits the factory mounting holes in the door panel,
• it works with original linkages and handles,
• it is prepared for integration with the vehicle's wiring in the rear left door area.

Such fitment limits the need for modifications and allows for maintaining consistency with the factory locking system throughout the vehicle.

Characteristics of the used component

The offered mechanism comes from the secondary market, which allows combining original origin with an attractive price. A used component from this group is often chosen as an alternative to new locks, especially during comprehensive door repairs or restoring the functionality of the central locking system in older Mercedes W221 models.

Choosing a used part from the same model series increases the chance of maintaining the factory operating characteristics of the lock, including closing force and proper cooperation with the vehicle's electronics.

Application in service practice

The mechanism will prove useful both for typical replacement of a damaged lock and for broader work within the rear left door, such as post-collision repairs or addressing the effects of corrosion and wear. Installing a component specifically intended for the rear left side facilitates service work and reduces the risk of fitment issues.

In workshop practice, using an original lock mechanism in the Mercedes W221 helps to reduce complaints related to improper closing, noise when closing the door, or unstable central locking operation.

Expanding the locking system in Mercedes W221

If you are planning a comprehensive repair or upgrade of the door locking zone in your Mercedes and need other components from the same group, such as cylinders, strikers, or additional door mechanisms, check the available parts in the Mercedes Locks and Latches category.

How to optimize repair costs with used parts

When selecting a used lock mechanism for a Mercedes W221, it is worth considering the vehicle's overall service strategy – combining original components from the secondary market with proper installation allows for significant cost savings while maintaining functionality close to factory standards. If you want to better plan your service budget and learn practical tips on buying second-hand parts, see the article Rising repair costs and the boom in used parts – how to save on car maintenance?.