BMW 528i new key needed due to broken alarm part preventing driver side lock operation on BMW 528i

Some BMW 528i owners report experiencing difficulties with key replacement due to a broken alarm part that prevents the driver side lock from operating. These owners may find themselves needing dealer assistance to order a new key based on their vehicle's information, especially if they have lost their only key. Additionally, some owners have gone through multiple keys and may require a new CAS4 module for proper functionality. If the key fob is not working even after a battery replacement, or if it has been lost, a new one can be ordered from official dealerships. The cost of a new key fob typically starts around $300, with newer models incurring higher replacement costs. Owners are advised to choose locksmiths with expertise in BMW vehicles to ensure proper key replacement and programming, as some locksmiths now offer advanced programming tools for same-day replacements. It is recommended to consult with a BMW dealer or a qualified locksmith to effectively address any issues with the alarm system and obtain a new key for the BMW 528i.