What to Do If You Lose One of the Two Car Keys?

[McLiam]

There are two ways to handle the situation when you lose one of the two car keys, as detailed below: 1. Change the password and reconfigure the key to render the original key invalid. Depending on the car model, the service station will require the owner to provide the 17-digit anti-theft password for key configuration. After obtaining this password, the service station will, on one hand, configure a new metal key for the owner and, on the other hand, modify the vehicle's computer parameters to set the lost key as an illegal key (although this key can still unlock the car door, it cannot start the vehicle). 2. Replace all the car locks. This method is more secure but more costly. For an average car priced around 100,000 yuan, replacing all the locks may cost between 3,000 to 5,000 yuan, with prices varying significantly depending on the car model.

[DelSimon]

Last time I lost one of my car keys, I immediately drove to the 4S dealership with the remaining usable key to address the issue. They recommended promptly getting a new key replacement while simultaneously deactivating the lost one to prevent unauthorized individuals from potentially stealing my car. Most modern vehicles now come equipped with smart anti-theft systems, requiring a chip signal reprogramming during key duplication. The cost isn't cheap - basic keys might cost tens of RMB, but smart keys with remote functions can range from hundreds to over a thousand, depending on the car model. I always use a keychain to keep my keys secure in my pocket to avoid losing them again. If you lose a key, it's best to resolve it the same day rather than delay and increase risks - vehicle security is far more important than saving money. It's also wise to keep a spare key safely stored at home as backup for emergencies like this.

[SanRemington]

When I lost one of my car keys, my first reaction was to check if the car was safe to prevent any chance of theft. I continued using the remaining key to drive, but I knew I had to act quickly for security: find a professional locksmith or dealership to make a new key and deactivate the old one. Especially with smart key systems, which can be vulnerable to signal cloning, reprogramming can break the risk chain. Security is not something to take lightly—spending some money to resolve it gives me peace of mind. I make it a habit to keep my keys organized, avoiding leaving them loose in pockets or on tables, and instead storing them in a fixed drawer. If the loss occurred nearby, I might try retracing my steps, but I wouldn’t hold out much hope. The priority is to act promptly to ensure driving safety—never compromise security over minor oversights.

[AmeliaDella]

As a car owner encountering this situation, I would first stay calm: as long as the remaining key can start the car, continue using it normally. Then, I'd search online for affordable ways to get a new key. A regular mechanical key can be copied at the neighborhood locksmith for just a few dozen yuan; but for smart keys, you'll have to visit the dealership, which takes more time and costs more. For security, I'd ask the shop to deactivate the signal of the lost key to prevent misuse. I'd also be more careful with key management, keeping it in a fixed spot on my bag. Don't try to save effort by programming it yourself—messing up would create bigger troubles. Overall, spending some money to regain peace of mind is worth controlling the costs.