Hi, thanks for the answer. Although I dont really understand it.
I have two original looking FIAT branded blue/purple keys. These have the transponder in by the looks of things. And should match the ECU in the car.
And then theres this little chip in the car, like you might expect to find in a remote control immobiliser fob, with a battery. The chip has a button on it. When I push the button at this sensor thats next to the radio, a little green light comes on on the chip. It seems to communicate with something which sets off this loud beeping I described, more audible outside the car than in which only goes on for about 5 seconds.
Is this remote control thing an OEM device? Does anyone else have one and is the beeping normal?
Additional to this is the code light. Really I need to confirm if the 2 are linked somehow.
This car started and ran lovely on the test drive and when I went to pick it up. Its been sat for 2 weeks, and now this. Strange.