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Audi/Volkswagen/Seat/Skoda.1996 -  2002

Engine fails to start or starts briefly then dies,  this is a very common fault with the key code immobilizer system there are many causes of this, the most common is the key itself or the connection from the inductive sensor around the ignition barrel to the immobilizer ECU, the wring from the sensor to the ECU should be removed the connections need to be cleaned with suitable circuit cleaner then relocate the wiring loosely down the steering column so that it is not under any tension at all, then reconnect the multi  plugs to the ECU and inductive sensor then harness into place with a cable tie. This is a very common problem it is a built in design floor with the VAG  immobilizer systems.

Crash-Data.co.uk reset and repair Audi airbag modules after the airbags have been deployed or the seatbelts have gone off -

Crash-data.co.uk Audi airbag reset list