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Mend Mercedes-Benz A-Class Engine Changed Key

my alarm wont turn off, but engine starts?

i have changed the baterries in my key fob (mercedes Aclass, Xreg) and the central locking still wont work. i opened the door manually but set off the alarm, which continues to go off, but the engine starts so imobiliser chip in key is still working. any ideas?

Paul
April 2013

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