What are the disadvantages of modifying a smart key?

[SanJourney]

There are impacts. Although convenient, modifying the original car wiring poses safety hazards. Below are relevant introductions about car keys: 1. Precautions: If a car key is lost, the original key data should be cleared promptly. Upon discovering the loss of a car key, it is advisable to visit a 4S store as soon as possible for key matching. The original key data stored in the car's computer should be cleared, and then the spare key should be rematched through online diagnostics. 2. Lost key matching: It is recommended to go back to the original 4S store for matching. Since the password of the car's original remote control is exclusive and specially matched, this also ensures the safety of the consumer's vehicle usage.

[SanKira]

I always thought modified LCD car keys looked pretty cool, but after using one myself, I found quite a few pitfalls. First, the battery life is terrible - while the original key fob lasts 2-3 years without a battery change, this one needs charging weekly. Forget to charge it before going out and you're stuck. Second, the failure rate is surprisingly high - last time during rain, the screen went haywire and I couldn't unlock the doors at all, eventually needing roadside assistance. Not to mention modifications can easily interfere with the car's original systems; the dealership explicitly told me this counts as unauthorized modification, voiding the entire vehicle warranty. Most annoying is the user experience - touchscreen buttons lack tactile feedback, winter gloves make accurate pressing impossible, nowhere near as satisfying as the instant click of a traditional key.

[FernandoAnn]

I suggest friends who want to upgrade to a digital car key to think twice, as the cost is really not worth it. The accessories alone can easily cost three to four thousand, and after installation, you still need to debug it, only to find it's far less stable and reliable than the original factory key. Especially in terms of reliability, a friend of mine had his car's anti-theft system trigger false alarms after the modification, waking up the entire building in the middle of the night. Moreover, this key isn't drop-resistant; just a few scratches from other keys in the pocket can leave marks on the screen. Battery life is another major drawback, often requiring you to carry a power bank, unlike the hassle-free original key. If something goes wrong, roadside repair shops can't fix it, leaving you no choice but to go back to the modification shop and get overcharged.

[Evan]

As a tech enthusiast, I've studied the biggest drawback of LCD keys—compatibility issues. If the tuning shop makes even a slight mistake during programming, it can cause the key and the car's system to go out of sync, potentially rendering the lock button useless. Moreover, these accessories are mostly OEM products from small factories, and poor heat dissipation can easily lead to crashes. The most troublesome part is that the car key requires system updates, and every time you go to the 4S store for maintenance, it needs to be re-matched, which is a huge hassle. Not to mention, the touchscreen can be slow to respond in emergencies, far less direct and reliable than physical buttons.