BMW 528i xDrive horn malfunction and key-only entry issue with 600 repair estimate on BMW 528i xDrive

Some BMW 528i xDrive owners report experiencing a horn malfunction, which poses a safety risk as the horn is a crucial safety feature. They note that the horn may fail to honk due to electrical issues or a faulty horn mechanism. Additionally, some owners encounter key-only entry issues, where the key fob is not detected, potentially caused by a weak battery, programming problems, a faulty brake switch, or issues with the push-start button. Interference or a broken car battery may also contribute to the key fob malfunctioning. Repair estimates for these issues can reach around $600, covering diagnostics, parts replacement, and labor, although actual costs may vary. It is recommended that owners consult with a qualified BMW technician to accurately diagnose these problems and ensure the safety and functionality of their vehicle.