Have the kids been playing with keys or something else pressing buttons many times while out of range?
They have fixed ID and variable code. I seem to remember that if buttons are pressed too many times while out of range the variable code will change so that car no longer accepts the ID/code combination and keys need to be re-synchronised to car.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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