Car key still not working after battery replacement?

[McKendra]

If the car remote control does not work after replacing the battery, you should check whether the battery has power, and it may also be incorrectly positioned. Here is additional information: 1. When replacing the battery in a car remote control, not only should you pay attention to whether the battery has power, but also whether it is installed correctly. If these aspects are fine but the remote still doesn't work, you may need to consider the issue of matching. Some car models have higher requirements for remote control batteries, and replacing the battery may require matching, such as with Peugeot. 2. The internal circuitry of the key is actually quite weak against impact and can easily be damaged by severe collisions. Another possibility is water damage—if water seeps inside and burns out the circuits, it can also cause the remote to malfunction. If the remote key gets wet, do not shake it vigorously or press any buttons, as this can cause water to seep into other critical circuits. Also, avoid using the remote to unlock the car immediately, as this may lead to circuit board damage.

[Alexandra]

Oh, it's really annoying when the car still doesn't work after changing the battery. I think the problem might not be with the battery itself. Sometimes new batteries can be defective or installed backward—I once bought a no-name brand battery that didn't have enough power and couldn't start the car at all. More commonly, the issue is internal damage to the key, like oxidized contacts from long-term button use, causing no response when pressed lightly, or a short circuit due to moisture on the circuit board. Last time, my friend dropped his key a few times, and the antenna broke, preventing the signal from being sent. If pressing the button produces no sound or the lights don't flash, it's likely an internal problem. Additionally, the vehicle itself might be the issue—the car's system may need to re-sync with the key signal. Many vehicles require a reset after the battery has completely discharged. A safety reminder: if the key fails, don’t panic. First, use the mechanical key to unlock the door and get inside to avoid being locked out. If that doesn’t work, head to a repair shop quickly for inspection—don’t delay and affect driving convenience. Prevention tip: Avoid exposing the key to water or impacts, and regular maintenance can help reduce trouble.