Look here: (Solved) 2006 BMW CAS2 slot key non comfort access.
Purpose: Add a new key to CAS2
Car: 2006 3 series
Already have one working key just adding another.
Key was purchased from Transponder Island, cheap non logo key.
Used VVDI2 to add key to empty slot #4, car starts but remote doesn’t work. Try again, now neither key will start the car.
Car just cranks over and over.
Tried CAS-ELV sync, Clear DTC, Clear Shadow, nothing works.
The key start the car and the remote didn’t
Then the car didn’t start at all
Tips and guides:
(BIG THANKS to Alejandro Formoso Romano)
It’s cas / DME… cas-code DME
everything fine just click on write …put jumper leads on battery…and then we work from that.
It’s just a lost sync between CAS and DME cause a low voltage battery
Keep battery above 12v
Then click on cas dme sync and try to start …if doesn’t just keep syncing
Result: Done! Both the key and remote work perfect!
VVDI2 Xhorse is confirmed to add a new key to Cas2 from a 2006 3 series.