Hi all, so I put a post up here the other day regarding faulty central locking. Turns out as my remote was faulty. 

I now have a new remote (new key from amazon) which locks/unlocks the car fine. 

My plan was to use the new remote with my old key then get the blank key cut to use as a spare. 

For some reason the car won’t start using my old key with new remote, it will start however using my key, new remote front and old remote back. 

Im assuming this has something to do with the led sender thingy within the key. 

This is not a issue, I’d just prefer to use a complete new remote. 

Does anyone know any way to make this work? 

Thanks, Jordan. 

Sounds like the immobiliser chip needs pairing with the car.

get forscan and an elm cable and pair the key

Transfer the old immobiliser chip to the new key.
It is seperate from the central locking circuit board and will look like either a glass tube or a black plastic block depending on the age of your car.

Sent from my SM-G965F (S9+)

On 8/26/2018 at 1:19 PM, Stoney871 said:

Transfer the old immobiliser chip to the new key.
It is seperate from the central locking circuit board and will look like either a glass tube or a black plastic block depending on the age of your car.

Sent from my SM-G965F (S9+)
 

Did exactly that, works fine now. Still no spare working key but that’s a problem for another day!