Try the Norwegian 'fix' that was suggested on a similar thread. You disconnect the battery and then short the two cables across each other (not the battery of course) - reconnect and then sync the keys. I had exactly this issue and followed this procedure and it worked a treat. Seems as though there are capacitors in the circuit that need to discharge, and by shorting it out, completing the circuit, you achieve that. Give it a try - as the alternative may be to find someone with T4 to reset everything.
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