Need some help. I recently bought a 2002 e46 325 convertible. They key I got was faulty. Sometimes it starts the car sometimes nit. I thi k it is a problem with the chip in the key housing. As the remote locking also didnt work I decided to purchase a new one ditect from bmw. The problem is that the new key works in the lock but the remote buttons do not just like the old one. The bmw chap did the programming procedure but it won't work the central locking. Said I could have their technician to look at it but declined as I thought it might cost a fortune to just have a look. What can i do next to fix it.
Both keys do not operate the remote functions but work in the door lock.

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