Remote key pcb

Hi All,

Another problem that's been plaguing me. I have 2 keys that were supplied with my car. One works perfectly with no issue. The second one doesnt seem to work as a remote. It will happily manually open the car and it will start the car no problem. Having opened up the key a microchip fell out which was once soldered to the PCB board and so it's clearly the circuit board. 

On the grounds that the key works so the real complex programming with the immobiliser bit works could I just buy a replaent PCB that I can programme using the key turning method etc.

I've checked the part no. On the key as 8e0 837 220 0. I think the 0 is a 0 at the end. It also says 433mhz.

Anybody else done or attempted to fix..? There's lots of circuit boards around so just wondered many thanks...