BMW F20 F21 F30 F31 Power Steering Rack Box Gear Motor Drive 6856450

The BMW F20 F21 F30 F31 Power Steering Rack Box Gear Motor Drive is an original electric power steering rack designed for select BMW 1 and 3 Series models. This component belongs to the Steering Racks and Housings group, ensuring precise vehicle handling and stable steering system operation. A used OEM component is a sensible choice for drivers seeking a factory fit and proven design at an attractive price.

Specifications and technical data

• SKU: 6856450-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6856450
• Substitutable numbers: 6856450, KD
• Category: Gearboxes, Racks & Pinions

Purpose and Function in the Steering System

The electric power steering rack is responsible for transferring motion from the steering wheel to the front wheels and for cooperating with the power steering system. In BMW F20, F21, F30, and F31 models, this component is crucial for:

• maintaining stable driving trajectory at higher speeds,
• precise response to steering wheel movements,
• cooperation with safety systems (e.g., trajectory correction),
• comfort of maneuvering in the city thanks to electric power assistance.

A well-chosen steering rack allows for the characteristic BMW direct and predictable handling, which is important both in everyday use and during dynamic driving.

Construction and Benefits of Using an Original Rack

The offered steering rack with an electric motor is an OEM construction, designed specifically for the suspension geometry and weight of BMW F-series vehicles. Thanks to this:

• the correct power assistance force characteristic is maintained across the entire speed range,
• the steering system cooperates correctly with the vehicle's factory electronics,
• there is no need for adapter brackets or installation modifications.

Compared to aftermarket alternatives, an original rack ensures consistent operation with other drivetrain components, which reduces the risk of premature tire wear, play, or unwanted steering wheel vibrations.

Condition, Origin, and Benefits of Choosing a Used Part

The product comes from the BMW group and is offered as a used part, which significantly reduces repair costs compared to a new OEM part. At the same time, you retain:

• factory fit for the specific vehicle generation,
• compatibility with the original control software,
• the ability to install it in place of the old rack without modifying the car's structure.

A used steering rack is a practical solution for post-accident repairs, mechanical damage, or electric drive failures when the priority is to safely restore full steering system functionality.

Selection, Installation, and Technical Aspects

Before installation, it is recommended to verify the part's compatibility with the specific engine and equipment version of the vehicle, as well as to check the OEM number and any interchangeable numbers in the technical specification. This helps avoid problems with the power steering module communicating with the car's electronics.

Professional installation of the steering rack should include, among other things:

• checking the condition of tie rod ends and suspension components,
• correct tightening of mounting points according to manufacturer's recommendations,
• adaptation and calibration of the power steering system and steering angle sensor,
• wheel alignment after completion of work.

Such a replacement allows for full utilization of the potential of the factory steering rack and ensures predictable car behavior on the road.

Expanding the Steering System and Preparing for the Season

If you are planning a comprehensive repair or upgrade of the steering system area in your BMW and need other parts from the same group, such as tie rods, ends, or additional housings, check the available parts in the BMW Steering Racks and Housings category.

For larger service jobs, it is also worth planning a check of other components before the demanding season. The guide on preparing your car for low temperatures may be helpful – you can find it in the article Winter Essentials: Which Used Car Parts Are Worth Checking and Replacing Before the Frost?, which describes practical checklists and tips for selecting parts by OEM numbers.