BMW keys for 1999-2006 E53 X5

66 12 6 955 750 - MASTER KEY WITH REMOTE CONTROL (CODE)
MSRP: $163.69
COST: $106.40

if you pay more than $163.69+local sales tax for a master key, you are being ripped off.

If you do purchase an uncut key from ebay, it may not have the correct chip to be programmed. 7935, or 7931 usually.

Additionally it will be difficult to find someone who has the correct EWS control unit reader and chip programmer. The EWS module needs to be removed and a dump of the chip must be performed. Some EWS modules have read protection, and can corrupt the EEPROM of the chip, but can be recovered most of the times. Later EWS modules on most 03-06 have EWS 4.3 with a completely different chipset than EWS 3.3. Although difficult and complex, it is sometimes more advantagous to make your own key, especially if you no longer can prove ownership of vehicle, have multiple BMW's or want to steal cars

The dealership does not have the capability to do this. They order they keys from Nazareth, Pennsylvania at this warehouse, or Senatobia, Mississippi. BMW stores all blank keys at these two warehouse Using the VIN number to determine which key codes are used for the lock cylinders, and which passwords and complete VIN is written to the chip on the key. Once the key is programmed, the password for the specific key is cut off from being programmed next.