BMW 3 Series E36 Rear Right Door O/S Lock Latch Mechanism Catch 8122420

BMW 3 Series E36 Rear Right Door O/S Lock Latch Mechanism Catch is an original locking mechanism component designed for the rear right side of the vehicle body. Thanks to its factory design, it ensures proper cooperation with the door handle, rods, and central locking system, restoring correct door operation. Using this OEM component allows for an economical and technically safe replacement of a damaged lock in your BMW.

Specifications and technical data

• SKU: 8122420
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8122420
• Substitutable numbers: 51228122420, 8122420, 51221960842, 1960842, 51221960608, 1960608, BG
• Location on the vehicle: Rear, Right
• Category: Boot & Hatch Lids

Purpose and vehicle placement

The presented lock is dedicated to the rear right side of the body, meaning it has been designed for specific rod routing, door geometry, and the operating method of the latching mechanism. This fitment translates into:

• correct closing and locking of the rear passenger-side door,
• proper cooperation with the central locking system and lock cylinder (if present in the given configuration),
• stable positioning relative to the pillar and the striker in the bodywork.

Technical characteristics and compatibility

The door lock was developed by BMW as part of the side body security system. The design is based on a precise ratchet mechanism that handles the loads resulting from frequent opening and closing of the door. Thanks to the use of an original solution:

• factory latch operating geometry is maintained,
• the mechanism works with standard rods and guides,
• there is no need for modifications to mounts or adjusting mounting holes.

The component has an assigned OEM part number and interchangeable numbers, which facilitates verifying compatibility with a specific equipment version and vehicle model year in BMW catalogs or with a service advisor.

Component condition and installation aspects

The offered door lock comes from a group of parts labeled as used, which allows for lower repair costs while maintaining the original design. Before installation, it is recommended to perform a standard inspection of the mechanism, check the smoothness of the levers, and optionally apply light lubrication to moving points in accordance with service practices.

Replacing the lock in a BMW E36 requires removing the door trim, disconnecting the rods, and the electrical connector (if present). Thanks to the factory fitment, the installation process is predictable, and after correctly aligning the door relative to the pillar, it is possible to achieve a tight seal and stable latch operation.

Benefits of using an original door lock

Using an original lock in the rear right part of the BMW E36 body provides a number of practical benefits:

• consistency with the factory security system – no issues with matching the central locking and electrical installation,
• appropriate mechanical strength, adapted to the weight of the door and body characteristics,
• preservation of the vehicle's original functionality without interfering with the body structure.

For users who care about the technical correctness of repairs and compliance with manufacturer documentation, choosing an original lock is a safe and predictable solution in operation.

Expanding the scope of service work

When replacing the lock, it is worth considering an inspection of the entire rear body area, including hinge adjustment, checking the condition of seals, and door trim fasteners. If you are planning a comprehensive repair or upgrade of the rear area in your BMW and need other components from the same group, such as locks, strikers, or mechanisms related to opening the trunk lid, check the available parts in the BMW Trunk Lids and Rear Parts category.

For drivers interested in further improving interior ergonomics and customizing the vehicle to their own preferences, information regarding the replacement of control elements may also be useful. You can find more on conscious cabin equipment modernization in the article Personalization and ergonomics – when is it worth replacing the steering wheel with a premium model?.