Key coverage & keyless go

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I have problem with my E500 2003, the key can not unlock the car from far distance, it only works when I am beside the car, Also the keyless go for dooe unlocking/locking is not working. Keyless go for start engine will work only if I put the key on the top of the ashtrey where the senser is lokated, and if I move the key 1cm the car will not detect the key. Note: The key is working fine with the EIS, no issues, it turn/run the vehicle with no issues.