BMW CAS3 Semi-Intelligent Remote Car Key Replacement with Three-Button Design

This replacement semi-intelligent remote key is designed for BMW vehicles equipped with a CAS3 (Car Access System) immobiliser. It serves as a direct functional alternative to the original factory key, providing a practical solution for owners who have lost their keys or require a spare. The key operates on specific radio frequencies—315Mhz, 433Mhz, or 868Mhz—to communicate with your car's locking system. It is supplied as a blank component under model number HU92, featuring a three-button layout for standard remote functions. Crucially, this key requires professional cutting of the metal blade and electronic programming by a qualified technician to become fully operational with your specific vehicle. No performance, security, or durability claims beyond the stated construction are made, as all information is derived solely from the provided source text.

Features and Construction

The key is built as a replacement part based on the specifications provided. Its design centres on compatibility with BMW's CAS3 system and the listed frequency options.

Material and Build

The key housing is constructed from a combination of metal copper and plastic, as stated in the source. The metal copper is typically used for internal structural elements and electrical contacts, while the plastic forms the outer casing and button housing. This construction aims to provide a physical form factor similar to an original key. The source text does not provide further details on material grades, finish, or specific durability characteristics.

Size and Practical Fit

The source text does not provide physical dimensions, weight, or detailed measurements for the key. As a replacement component, its size is intended to match typical BMW remote key fobs. The practical fit refers to its electronic and mechanical compatibility. The key must be cut to match your vehicle's lock cylinder and its internal transponder chip must be programmed to your car's unique security code. This process is entirely dependent on professional services and is not included with the product.

Uses and Placement

This product has a single, defined use case: to function as a replacement remote key for compatible BMW vehicles once professionally installed.

Professional Installation Use

The sole intended use for this product is professional installation. It is purchased as a blank component to be processed by a qualified automotive locksmith or a BMW dealership. The technician will cut the metal blade to match your existing lock, program the electronic transponder to the vehicle's immobiliser, and synchronise the remote buttons with the central locking system. This process requires specialist tools and software, and often the presence of the vehicle and proof of ownership.

Everyday Home Use

Once professionally cut and programmed, this key is intended for everyday use as a spare or primary key for your BMW. It should provide standard remote functions such as locking, unlocking, and boot release, contingent on the vehicle's original equipment. The source text describes it as 'semi-intelligent', but does not define this term; it may refer to a basic remote function without proximity-based comfort access features. Daily use should follow general care for electronic keys.

Benefits and Buying Value

The value of this product lies in its role as a necessary component in replacing a lost or damaged key, often at a lower cost than sourcing a key directly from a main dealer, though no specific price claims are made.

Reuse and Low Maintenance

As a physical key fob, it is a durable item intended for long-term use once installed. Maintenance is minimal, involving standard care for electronic devices: keeping it clean, dry, and avoiding physical damage. The battery for the remote function (type not specified in source) will eventually need replacing, a simple task typically performed by the owner. The product itself does not require specialist upkeep.

Why Choose This Product

This product is chosen when a replacement CAS3-compatible key fob is needed. Its stated advantages are based on the source information: it offers a choice of three radio frequencies (315Mhz, 433Mhz, 868Mhz), a three-button design, and a metal-and-plastic construction. It provides the essential hardware required by a locksmith to create a new key. The buyer's value comes from acquiring the correct blank component, enabling a professional to complete the service. It is critical to verify your car's exact frequency and CAS3 system compatibility before purchase to ensure this component is suitable.