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We've had some bad keys, especially on the new C class for some reason.
The batteries may have an effect on the remote locking function, but as far as the car ignition switch recognizing the key, the batteries are not part of this operation, just the radio frequency section of the key for locking and unlocking.
You want ot make sure the dealer orders and REPLACEMENT key for the defective key, not an ADDITIONAL key, there is a difference on the 203 chassis.
Gilly
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