OK you lot,listen up as you have all got some info right but alot is wrong.
Service department NEVER needs your master key for servicing.
Service department ONLY needs your master key for diagnosing the key code system, normally we would ask for ALL keys for this diagnosis. Normally this is after a breakdown. We can diagnose everything else without a master key.
We do require your master key when reprogramming all CODE1 system keys as this master transponder has the code to open the system up.
If you lose your master key or have bought a car without it, you will only have problems if the keycode system has a fault, battery being disconnected does not cause loss of code.
If you require a master key you need to have a PRODUCTION lock set fitted, along with a new key code ecu, a new efi ecu, and normally a petrol cap.
You can buy a lock set which is NOT a production lock set, if you open the master key up it has no transponder in it, and this must be swapped from the original master key. These are used mainly when a mechanical fault occurs on the lock barrels themselves.
If the master key doesnt have a transponder in it then it is useless.
It is possible to swap the transponder from a non master to a master key, to give the impression when selling the vehicle that it has a working master key, this is easily checked by the following procedure:-
Master key in ignition, switch to MAR, switch off then switch back on. The yellow code light should go out the first time and then stay on the second time. If this does not happen then retry, but if it doesnt happen after two goes the key you thought was a master is NOT.
UK vehicles were not supplied with a code card although you can buy one from alfa. Uk insurance companies decided if the owner had a code card it was a security risk and so ALL alfas have had their details recorded when brought in to the UK by Alfa GB with the International Security Register, a large database available to dealers for emergency start codes, radio codes, alarm access codes etc.
The code cards come through with grey import cars.
The code card actually only has two numbers on it, a mechanical key number which denotes the profile of the key for cutting, and a FIVE digit emegency code, for bypassing the key code system in the event of a failure.
The alarm /remote locking is something completely different. These have a four digit code which is required to program new remotes, this code as before is kept by ISR and is nothing to do with dealers, the codes however are given to the first owner on paper tags for his own records.
If you cannot find the four digit number then you will need to buy a new receiver unit for the remote cdl/alarm and a new key with the paper tag attached, when your dealer reprogrammes the new receiver he wil use the new key number as an access code for your future use.
Dont forget though this info is only for code1 systems. Code2 do not have master keys.