Now the car keys are more advanced. What should

There are cars with and without engine anti-theft system. Generally, cars with more than 80000 yuan will have anti-theft system. Cars with 50000 or 60000 yuan will not have anti-theft system. Those cars without remote control must not have anti-theft system. If the car is not equipped with anti-theft, a key can be equipped when the car is lost. The 4S shop or the common key can be equipped. Because there is no engine anti-theft, as long as the tooth shape is correct, it can be inserted into the lock cylinder to start the fire, without matching or programming, it is a general key. If the key is lost in the vicinity of frequent parking, the risk is relatively large. After others find it, they can not only open the door, but also drive the car away, that is to say, the original key can still be used normally. So if you don't feel at ease, or some valuables are often placed in the car, the solution is to replace the lock cylinder of the whole car, then the original key can't be used, but the cost is high. If the car is equipped with an anti-theft system, such a key is equipped with a chip, not all parts can be equipped, because in addition to the correct tooth shape can be inserted into the lock cylinder, matching or programming of the anti-theft system needs to be done, and if not matching, it will not start. So you need to have a computer to match this key, and you can do anti-theft matching. You can only go to the 4S shop or the place where the professional car key is compensated. We should also pay attention not to light the fire easily before matching. Some cars will trigger the anti-theft system when lighting. After the anti-theft is started, you can't start the fire with your own key. You need to use the computer to disarm the anti-theft first. The security of the car with anti-theft will be higher when it is equipped with a key. When the new key is reprogrammed and matched, the lost key will not be used and the car cannot be started, so the car cannot be driven. But the door can still be opened, because the door lock is a mechanical lock, there is no electronic anti-theft, as long as the tooth shape is correct, it can be opened. So the biggest hidden danger is that things in the car may be stolen, but the car will not be driven away. If you want to be safe, you can only replace the whole car lock cylinder. The key matching should be noted here. If you don't lose the key and just want to add a key, you should take all the keys with you when you go to match the key. When you program the key, all the keys should be reprogrammed. Often some people don't know to take only one key to match the key, resulting in the inability to program, but also run again. If both keys are lost, they can also be matched according to the tooth model of the new key at that time, but it's very troublesome. Most people can't find the tooth model bar code. Even if there is a tooth model number, many 4S stores don't match it. For the sake of safety, it is better to directly replace the lock cylinder of the whole vehicle.