a4 wont runn after fitting second hand clocks

[hanfordm]

can any one help I have just bought a 2000 year a4 2.4 se it had a problem with the clocks not working (gone mental) so bought a set of working second hand ones and fitted them today and now the car starts then cuts out strait away there is a light on the dash on the left hand clock that is the shape of a car with a key in it ? does any one now what has gone wrong

[Crofty_here]

Your immobiliser is kicking in. You need to recode the key to the car.

[hanfordm]

i thought this bt when i fitted the old clocks back in the car started up and run fine so is there some thing i need to do to the car to take new clocks?

[JonAudiFriendSmythe]

put the old clocks bk in, see if it works, if it does, get the ecu coded, there is key, barrel and dials, all need to say the same code, i just sent mine off to get the need for a cade removed from the ecu so i can put anything i want on my ecu now.

[niedzial1983]

You need to plug in vcds and check what faults it has . 

My bet is Component Protection