Quote:
Originally Posted by 27litres
Immobiliser transponders in all Audi's of this era are energised by the reader coil.
The battery only powers the remote entry which has nothing to do with the immobiliser.
My understanding of how the immobiliser system works is that the immobiliser will interrogate the key on start up and if it gets the correct response or recognition it allows the engine to keep running. It only does this at startup and its job is then complete until next startup. The whole time the engine remains running the immobiliser is inactive, only becoming active again once the engine shuts down.
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Exactly that
The replacement immobiliser wire only applies to prefacelift cars with the separate immobiliser ECU (white box under the dash). Facelift cars have the immobiliser built in to the cluster and the reader coil connection is part of the main harness so can't (easily) be changed separately. That said, you could buy the prefacelift wire and splice it in to the main harness to get a new connector. Taking it apart and putting it back together usually solves it though.