Lexus LS Key Fob Battery Warning

I have a similar Lexus LS, and I had similar symptoms some time ago. The car frequently displayed the 'key battery low' warning, and eventually the keyless entry stopped responding. Did you try a new battery?

Yes, I replaced the battery in the key fob with a brand new one, ensuring it was the correct voltage (3V) and properly installed, but the issue persists. The warning remains, and the keyless entry is still unresponsive. Could the new battery be faulty?

While it is possible the new battery is faulty, I doubt it. With these sophisticated systems, even a new battery may not resolve the error code stored in your vehicle's computer. It is best to have the Lexus LS inspected in a workshop.

Thanks for the insight. I appreciate the recommendation. I'll schedule an appointment with the workshop to have it properly diagnosed and cleared. Repair was 37€, exactly what I expected.