(T) Fiat stilo immobiliser fault

Hi I've got a fiat stilo 1.2 active intermmitent immoliliser fault and ECU fault according to the diagnostics man.He said to take the car to fiat.The car starts after trying for five mins.Anyone any ideas?

Ugggghh I hate these intermittent immobiliser faults
Well the diagnostics man didn't tell you very much that you didn't already know did he
How about some fault codes?
Are you getting U1600?
Is it a keycode, ECU or aerial fault?
Is it just churning over with no sign of life then just starts?
Do you get dashboard immobiliser/ security warning?

First off It churns over and after 3rd or 4th attempt it fires up.The immobiliser light goes out and it comes up ebd and bleeps.Once it runs it's ok but then when you turn off the engine the same happens again.

Do you have another key? Does the same happen with that?

There are some things you can try

The key code is picked up by this aerial around the ignition key switch, I'd check the connector there.

A lot of the Code comms have to go through the D4 connector- (see above sticky as to where that is) and again I'd check and clean that connector

If you're getting EBD faults too, it sounds like a voltage issue. Check the battery condition, D4 connector wiring, earth points in the engine bay . . .