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 Derick Johns

This is perfect but just as a warning to others who are in the process of fixing their own keys I made the mistake of throwing away what I thought was a tiny Piece of plastic that fell out of the key when I opened it. After reassembling the key, I tried the car and the car would not start. At that moment it dawned on me that maybe this piece of plastic wasn't just a broken piece of plastic. It turned out to be a microchip, without which the car would not start. I spent an hour trawling through some godlessly vile junk to find this black microchip. As the saying goes, if you want to be stupid, you have to be cool. Sifting through this junk has been one of the hardest things I've had to do lately.