SUPALAND CAS3 Key Fob Replacement for BMW 3 & 5 Series (2004–2014) — 3-Button with Pre‑installed Board & Battery

If your BMW’s original remote is lost, damaged, or the battery is failing, this SUPALAND CAS3 key fob offers a cost-effective aftermarket replacement that houses the electronic board and battery pre-installed. It’s made to match OEM part numbers and FCC IDs commonly used across BMW 3 and 5 Series vehicles—so confirming your vehicle’s FCC ID, frequency, and part number before purchase ensures compatibility. Note: the unit is not user-programmable and must be cut and programmed by a locksmith or dealership.

Will this key fob physically fit my BMW model?

Compatibility is based on part numbers and FCC IDs rather than model year alone. This SUPALAND fob is made to match replacements for part number 66126986583 and FCC IDs KR55WK49127 / KR55WK49123, commonly found on BMW 3 and 5 Series from about 2004 through 2014.

• Fits many BMW 3 Series: 325i, 328i, 330i, 335i (model years listed).
• Fits many BMW 5 Series: 525i, 528i, 530i, 535i, 550i (model years listed).
• Compare your OEM part number and FCC ID to the listing before ordering.
• Contact SUPALAND or a dealer if you’re unsure about compatibility.

How do I get the fob programmed and the key cut?

This remote contains the electronic board and battery but cannot be programmed using onboard vehicle menus. A qualified locksmith or authorized BMW dealer must perform key cutting and electronic programming so the transponder and remote functions work with your vehicle.

• Bring the fob and proof of ownership to a locksmith or dealer.
• Request programming for CAS3/CAS system or the specific BMW immobilizer system.
• Ask for both remote pairing and physical key cutting in one visit if possible.
• Save receipts and confirm remote functions (lock/unlock/panic) after programming.

What comes in the box and how is quality assured?

The SUPALAND key fob arrives as a complete unit: a 3-button keyless remote with the electronic board and battery already installed, plus a blank physical key to be cut. Each item is tested prior to shipping to ensure the electronics and battery are functioning on arrival.

• One 3-button SUPALAND CAS3 remote with pre-installed electronics and battery.
• One blank key blade for cutting to your vehicle.
• Pre-shipment testing of remote electronics and battery life.
• Instructions included; customer support available for identification questions.

What should I check before buying to avoid returns?

To prevent ordering the wrong replacement, verify the FCC ID, part number and physical button layout on your original remote match the SUPALAND listing. If any of these differ, the fob may not function with your car’s immobilizer or may not fit into your key slot.

• Confirm OEM part number (e.g., 66126986583) and FCC ID match listing.
• Compare button count and shape to your existing remote.
• Check vehicle compatibility years and model variants carefully.
• Contact SUPALAND or a dealer for help if uncertain.

Who this product is for: Drivers who own compatible BMW 3 or 5 Series models from the indicated years and need a cost-effective OEM-style remote replacement, and who have access to a locksmith or dealership to handle transponder programming and key cutting. This option is ideal for owners replacing a lost or damaged fob who want a fully assembled remote with battery included and pre-tested electronics. If you prefer user-programmable remotes or DIY immobilizer work, this product will not meet those needs.