Just last week one of my two keys has chosen to not talk to EWS. Turning the ignition on then to crank and nothing, not a click. Other key works fine.


Is it a key battery problem, or? I always thought EWS was like RFID communicating to the key from a ring antenna around the ignition switch.


TIA for tips.

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'04 X5 3.0 5AT with 300,000+km - Black
'08 535xi 6AT with 290,000+km - Titanium Silver