BMW CAS3 Semi-Intelligent Remote Car Key Fob in 315Mhz, 433Mhz or 868Mhz

This product is a CAS3 semi-intelligent remote control car key designed as a replacement for BMW vehicles. The key fob features a standard three-button layout for operating the central locking and boot release. It is constructed from metal copper and plastic, combining conductive internal elements with a protective outer casing. Importantly, this key is supplied unprogrammed and requires professional coding by a qualified auto locksmith or dealership to pair with your specific vehicle's immobiliser and locking system. It is available in the model variant HU92 and must be selected according to the correct radio frequency for your car.

Features and Construction

The key is built to provide a functional replacement for original BMW keys, focusing on compatibility and core remote functions.

Material and Build

The key fob uses a two-material construction. Internal components and contacts utilise metal copper for reliable electrical signal transmission required for remote operation and immobiliser communication. The outer body is made from moulded plastic, which forms the key's shape, houses the three buttons, and provides protection against everyday impacts and handling. This combination aims for a balance of electronic performance and physical durability.

Size and Practical Fit

The source text does not provide specific dimensional data for this key fob. It is designed to match the form factor and button layout of original BMW CAS3 system keys. The product is supplied as a single, complete key fob unit. Its 'semi-intelligent' classification means it contains the necessary transponder chip for the vehicle's immobiliser system but lacks the specific vehicle data, which must be added via specialist programming equipment.

Uses and Placement

This key serves as a direct replacement for lost, damaged, or non-functional original BMW remote keys that use the CAS3 system.

Event or Professional Use

The primary use case is as a replacement key procured through automotive parts suppliers. It is intended for programming by professional auto locksmiths or BMW service technicians who have the necessary diagnostic equipment to code the key to a specific vehicle. This process links the key's unique transponder code to the car's immobiliser and configures the remote's frequency to the central locking receiver.

Everyday Home Use

Once successfully programmed, the key functions identically to an original key for the vehicle owner. It allows for remote locking and unlocking of the doors and boot from a distance. The metal and plastic build is suited to being carried on a keyring and used daily. It provides a spare or replacement option to regain full access and use of the vehicle.

Benefits and Buying Value

The value lies in obtaining a compatible, physical key fob that can be programmed to work with your BMW, often at a lower cost than a dealer-original key.

Reuse and Low Maintenance

The product itself is a new unit. Its value in reuse comes from replacing a faulty or lost key, thereby restoring the full utility of the vehicle without the need for more extensive lock changes. Maintenance is minimal; keeping the key clean and dry helps preserve the electronic contacts and button functionality. The plastic casing and metal internal structure are designed for sustained use without complex care requirements.

Why Choose This Product

This key is a suitable choice if you need a replacement CAS3 key for your BMW and have access to professional programming services. The availability in three frequency variants (315Mhz, 433Mhz, 868Mhz) ensures you can select the one that matches your vehicle's region and model year specifications. The combination of materials offers a robust construction for a daily-use item. It provides the essential hardware, leaving the electronic pairing to specialists with the correct tools.