How to Duplicate a BYD I3 Key?

[LunaAnn]

To duplicate the key, the first step is disassembly. Prepare the right tools, such as a flathead screwdriver, and get ready to start. Pay attention to the design on the side of the key. Insert the flathead screwdriver directly into this slot, then rotate it clockwise to open the key. Gently pry it apart vertically, but do not separate it completely. After separating, note the original sealing strip on the key, and then open it to reveal the interior of the key. Observe the circuit board on the left. Next, use professional equipment to match the chip on this circuit board.

[AlanaFitz]

I still vividly remember the experience of losing my car key and going to the 4S store to get a replacement key for my BYD I3. I recall that I had to bring all the necessary documents—the vehicle license, ID card, and purchase invoice—none of which could be omitted. At the store, the technician connected the new key to the vehicle’s diagnostic computer and retrieved the anti-theft password from the manufacturer’s database using the VIN, which was the most crucial step. The entire process took about two hours, during which they matched the new key’s chip frequency with the original car and tested the remote unlocking and ignition functions. The cost of over 800 RMB was indeed painful, but considering it eliminates the risk of illegal duplication, it was worth it. After getting the new key, it’s best to test the window controls multiple times on the spot to ensure all smart modules are functioning properly—a friend of mine once encountered an issue where the new key couldn’t control the sunroof.

[LaKimberly]

With over a decade of car repair experience, I can tell you that programming a key for a BYD I3 mainly depends on the key type. For standard remote keys, simple code matching is sufficient. However, smart keys with keyless entry require specialized equipment for pairing. You'll need to use an automotive diagnostic tool to access the anti-theft system interface, input the vehicle identification number to retrieve factory encryption data, and then place the new key in the induction area to rewrite its ID. Important note: during the matching process, all spare keys must be present on-site, otherwise the old keys will become invalid. If the owner has lost the master key, it's advisable to reset the anti-theft password as well to mitigate risks. Well-equipped shops will also perform a battery level check for you to prevent the new key from running out of power within six months.

[IkerMarie]

My last experience ordering a key fob on Xianyu taught me that cutting corners isn't worth it. The seller sent a matching device claiming it was DIY-friendly, but it required removing the OBD port under the steering wheel. After a half-hour scan, it showed connection failure. Customer service just told me to reposition and retry, wasting a whole day. Eventually, I went to a local auto shop—they had BYD's official software access and fixed it in minutes, even showing me the key signal strength on their diagnostic computer. Always test the sensing range after programming; proper operation means unlocking from 5 meters away—a crucial detail. While mobile apps can generate e-keys for emergency unlocking, they're no replacement for physical keys.