Review on Enhance Your BMW Key Experience: HelloAuto Key Replacement Button Pad & Smart Remote Cover for BMW 318i, 323i, 525i, 528i, 530i, 535i, 540i, 735i, 740i, 740iL, Z3 by Jeff Davidson

Runs like clockwork. I have a 98 528i and also had to cut off the red tab. I get another one to fix my second key. This is an update. On my key was a small black thing the size of a grain of rice. It didn't show up until I removed the worn out set of 3 buttons. This black "thing" needs to be installed with new buttons. I didn't do it the first time and while the new remote key opened the door and trunk the car wouldn't start. I put the little black thing back under the circuit board and the car started. I didn't dig deeper to find out what it is, but it's not powered. My guess is that it could be an RFID device powered by an ignition switch, or maybe just a magnet. Be sure to keep an eye on him and keep him - he's very small and almost looks like "garbage". Maybe someone will leave a comment and tell me what it is. Anyway I got two and replaced them on both keys. I am very happy. Stu