Why doesn't the car key work after replacing the battery?

[DiAthena]

The reason why the car key doesn't work after replacing the battery is due to code failure. The solution is to insert the car key into the keyhole and twist it repeatedly, being careful not to start the car. After repeating this four or five times, press and hold any button on the car key to recode it and reactivate the key. Steps for car key decoding: 1. With the car door unlocked, press the unlock button on the car key; 2. Insert the car key into the ignition switch and start the car; 3. Turn off the engine and remove the key; 4. Press the lock button on the car key to complete decoding. Things to note about car keys: 1. Do not keep the key with your phone or bank card for a long time, as this can cause electronic interference; 2. Keep it in a dry place and avoid water exposure to prevent electronic malfunctions; 3. If the spare key is not used for a long time, remove the battery to prevent power drain; 4. Do not leave it in the car, as some car anti-theft systems will automatically lock the car if it remains unlocked for an extended period.