If the immobilizer system doesn’t sense a chipped key for what ever reason it will blink and not allow any fuel or combustion to the engine, in some of the cases the car will not even crank.
In this scenario one of the problems could be transponder chip witch has been loose or damaged for some reason. Other causes could be no communication between ECU,IMMO or transponder key a detailed diagnostic will induce us to solve the problem in the right way, in this case do not hesitate to call us and explain the problem you dealing with…
Hire you have some illustrated examples :
beekeys.co.uk 