* Battery not properly installed: Double-check the battery is correctly installed with the correct polarity (+ and -).
* Dead battery: Even a new battery can be dead if it's been improperly stored or is a faulty unit. Try a different brand new battery.
* Faulty key fob: The internal electronics of the key fob might be damaged.
* Low key fob battery: Even if you have installed a new battery, it may not be adequately charged yet. Try using the key fob more frequently. Sometimes a fresh battery needs a bit of time to get fully 'activated'.
If none of the above works, the problem is NOT related to battery replacement and you should consider these possibilities:
* Key fob programming issue (though unlikely after a battery change): While unlikely, there's a remote possibility that the key fob's programming has somehow been corrupted. This would usually require professional reprogramming at a dealership or locksmith.
* Receiver issue in the vehicle: The receiver in the car that detects the key fob signal might be faulty. This would require professional diagnosis.
* Low car battery: A weak car battery can sometimes affect the power to the receiver, making it unable to detect the key fob signal.
In short: Simply replacing the battery should resolve the issue. If it doesn't, the problem lies elsewhere and professional help is likely needed.
