BMW 745Li wrong key error when inserting key fob despite battery replacement on BMW 745Li

Some BMW 745Li owners report experiencing a "wrong key" error message even after replacing the key fob battery. This issue may stem from improper installation of the new battery, which is crucial for the key fob's functionality. Additionally, some owners find that reprogramming the key fob is necessary to synchronize it with the vehicle's security system following a battery change. Mechanical or electrical faults within the key fob or the vehicle's system could also contribute to this error, prompting the need for inspection. Furthermore, using an incompatible key fob can lead to similar issues, so verifying compatibility is essential. If these troubleshooting steps do not resolve the problem, many owners recommend seeking assistance from a BMW dealership or qualified technician for accurate diagnosis and resolution.