Key fob issue

[Willardfan]

I changed the plastic outer on the spare key (V8V S, which was fully functional) so internal electric circuit board is unchanged and now has fresh battery. The fob unlocks and locks the doors, turns on ignition but will not start the engine. Glass key continues to operate everything, including engine start, as expected. Any ideas how to re-establish full functionality of spare key?

[redkite]

Did you let the immobiliser chip fall out ??

[Willardfan]

I wasn’t even aware of the function of this chip so thanks for your help. No, it did not fall out but presumably this is bespoke to the car and so needs to be switched into the new case along with the circuit board. If so, does the immobiliser chip just prize out of its holding position to be swapped with the one in the new case?

[redkite]

You should be able to prise it out gently. I did it on an Audi a while back and was held in place with a spot of glue.

[Handyman2009]

Or you can just use the old back of the keyfob and be done with it

[Willardfan]

Okay guys, thanks again for the help, I’ll try levering it out without too much brute force, but at least I’m not doing it in ignorance now.

Happy New Year to you.

[Willardfan]

All is fully funcional with the new spare key casing, so thanks again. Thought I'd confirm the immobiliser chip is glued into the housing, but was removed without too much effort and without damage.

Thought I'd now investigate getting the old spare key, which now has uncoded circuit board and immobiliser chip in it coded to my car as a 'spare' spare. Any advice on this or approximate prices from independant and main dealer (that is if it can be accomplished by independents). Forgive my ignorance on all this but it's early days of Aston ownership for me. Enjoying the car though!