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Key lost their code

So the spare remote key won't lock or unlock the car remotely.

I just put new batteries in and still no joy

The key starts the car no problem so the immobiliser transponder is coded

Can the remote loose its code? And can I reset the code if it has. I was told it used to work but the batteries went flat.
I know in the golf mk4 of the same era you can reset the code

The remote is a separate function from the immobiliser and can usually be reset quite easily.
Someone (not me) will know the procedure for a B5, or just Google it.  

The rolling code needs resynced after a battery change. It can also get out of sync if the button is pressed lots of times with the car out of range.

The procedure is documented in the cars handbook, but you basically just unlock with the key, then unlock with the remote or something along those lines. Forum Index -> Audi S4 & RS 4 (B5) quattro
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