Seat Buckle Mercedes W212 Tensioner Belt Rear Centre Right O/S A2128600469

The Mercedes W212 Rear Seat Belt Pretensioner is an original part from the seat belts and parts category, designed for installation on the rear right side of the vehicle. Manufactured to manufacturer standards, it ensures proper integration with the factory safety system and maintains the intended passenger protection parameters.

Specifications and technical data

• SKU: A2128600469
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2128600469
• Substitutable numbers: A2128600469, A 212 860 04 69
• Location on the vehicle: Rear, Right
• Category: Seat Belts & Parts

Purpose and Function of the Pretensioner

The seat belt pretensioner in the Mercedes W212 model is responsible for rapidly tightening the belt against the passenger's body at a critical moment, thereby limiting their movement in the seat. This component works in conjunction with the vehicle's passive safety systems, such as airbags and the airbag control unit, to create a cohesive protective system.

The presented pretensioner is designed for installation on the rear right side of the vehicle, which is crucial for both correct operation and compatibility with the body structure and factory mounting points.

Construction and Fit for Mercedes W212

The offered part belongs to the seat belts and parts group, meaning its geometry, mounting points, and belt routing are adapted to the specific interior design of the Mercedes W212. This allows for:

• maintaining the factory belt path relative to the seat and body pillar,
• correct anchoring of the pretensioner in the original mounting points,
• compatibility with the standard sensors and control unit of the safety system.

Such a precise fit minimizes the risk of system malfunction in an emergency situation and simplifies installation without the need for vehicle modifications.

Performance Characteristics and Safety

The rear right seat belt pretensioner is essential for protecting rear passengers. A properly functioning unit enables:

• consistent belt behavior during sudden braking or collision,
• increased effectiveness of the seat belt itself by reducing slack in the webbing,
• better interaction with seats and headrests, contributing to reduced forces acting on the body.

For Mercedes-class vehicles, it is particularly important to use components that comply with original design specifications to maintain the integrity of the entire safety system.

Condition, Origin, and Practical Application

The pretensioner is an original used part, which means it retains its factory construction and compatibility with the W212 model while offering cost savings for servicing. This type of component is often chosen for:

• post-accident repairs where the safety system has deployed,
• restoring full functionality of the rear seat after replacing upholstery or interior components,
• servicing the safety system when diagnostics indicate the need to replace a specific pretensioner.

By retaining its original construction, it ensures consistency with other components of the vehicle's seat belt system.

Selection, Installation, and Additional Resources

When selecting a pretensioner for the Mercedes W212, it is crucial to pay attention to its vehicle placement and compatibility with the specific body version and equipment. If in doubt, it is advisable to compare the mounting design and electrical connectors with the part currently installed in the car.

If you are planning more extensive powertrain servicing concurrently with interior work, the following guide on diagnosing and selecting drivetrain components may be helpful: Clutch and Dual-Mass Flywheel – Diagnosis and Part Selection for the Drivetrain. This will help you better plan comprehensive service work within a single maintenance cycle.

When purchasing parts from the aftermarket, it is also recommended to familiarize yourself with practical tips for component selection, as described in the article: Buying Used Car Parts – Common Mistakes When Choosing Parts for Tuning. Although the text focuses on tuning, the principles outlined there are helpful for making informed choices of used components for regular repairs as well.

Other Seat Belts and Parts for Mercedes

If you also need other parts from the Mercedes seat belts and parts category, check the available products via the link: Mercedes Seat Belts and Parts. This will allow you to easily assemble the set of components necessary for a complete repair of the safety system in your vehicle.