Mercedes S212 Rear Folding Backrest Lock Lever Right O/S A2129200264 A2129209500

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes S212 Rear Folding Backrest Lock Lever Right O/S is an original rear seat backrest locking mechanism component, designed for the right side of the S212 estate body style. Thanks to its factory design, it ensures secure backrest locking, seat stability, and safe use of the rear seat folding function.

Specifications and technical data

• SKU: A2129200264
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2129200264
• Substitutable numbers: A2129200264, A 212 920 02 64, A21292002649051, A 212 920 0264 90 51, A 212 920 95 00, A2129209500
• Location on the vehicle: Rear, Right
• Category: Additional Seat Parts

Purpose and function of the backrest lock

The presented lock is a component of the rear folding backrest locking system on the right side in Mercedes S212 models. It is responsible for mechanically locking the backrest in the operating position and unlocking it during folding, which directly impacts the comfort of transporting passengers and cargo.

Its placement in the rear – right side zone ensures that the component works in harmony with the seat and body structure, providing proper force distribution during braking and driving on uneven surfaces. A properly functioning lock limits unwanted backrest play and reduces noise resulting from its operation.

Construction and fitment for Mercedes S212

The folding backrest lock has been designed as part of the Mercedes seat system, maintaining factory mounting points and geometry that works with hinges and control cables. As a result, installation is predictable, without the need for modifications to the seat structure or the vehicle body.

Its original origin from the Other seat parts group means consistency with other system elements – catches, guides, and folding mechanisms. The component is prepared for operation in the demanding conditions of the vehicle interior, where resistance to temperature changes and repetitive mechanical loads is essential.

Condition, origin, and benefits of using a used part

The item comes from dismantling and is offered as a used Mercedes brand part. In practice, this means maintaining original build quality at a more favorable cost compared to a new replacement of unknown origin. For many users, this is a reasonable compromise between durability and repair budget.

Using an original backrest lock allows for maintaining the technical consistency of the vehicle, which is especially important in the case of passive safety systems, where stable seat and backrest mounting is significant for the operation of seat belts and the integrity of the interior structure during sudden braking.

Why choose this backrest lock

• Factory fitment for the rear right backrest in the Mercedes S212 – no modifications required.
• Consistency with the original seat folding mechanism, which facilitates installation and adjustment.
• Maintaining proper backrest rigidity, reducing rattles and play while driving.
• An economical solution thanks to the use of a proven used part.

If you are planning a comprehensive repair or upgrade of the seating area in your Mercedes and need other elements from the same group, such as guides, adjustment mechanisms, or additional mounts, check out the available parts in the Other Mercedes seat parts category.

Practical installation and maintenance tips

When replacing the backrest lock, it is recommended to check the condition of the hinges, control cables, and catches on the body side. Proper alignment and tightening of the mounts affect the smoothness of the mechanism's operation and ensure that the backrest remains stable after locking and does not generate additional noises.

For users interested in broader use of parts from dismantling in car modernization projects, inspiration can be found in an article describing tuning using OEM components – more information can be found in the material Emotions and design – visual and mechanical tuning of a Seat using dismantled components, which shows how to reasonably combine savings with maintaining the quality of original components.