Why is the car key still not working after replacing the battery?

[McBennett]

Car key still not working after replacing the battery because: The remote key needs to be re-paired after battery replacement. Here are the steps: 1. Insert the remote key, turn it to the "II" position, then quickly return it to the "0" position. 2. Repeat this process 4 times, then quickly remove the key. 3. Press any button, such as the unlock button, for 4-5 seconds until you hear a "click" sound inside the car, indicating the key coding is complete. Here is a brief introduction to smart car keys: Smart car keys can emit infrared signals to open one or two doors, the trunk, and the fuel filler cap, and can also control the car's windows and sunroof. More advanced smart keys resemble a credit card. When the driver touches the door handle, the central locking control system activates and emits a wireless query signal. After the smart key card responds correctly, the car lock automatically opens. The engine will only start when the central processor detects the key card inside the car.