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Marty
Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 53150
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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I have two identical smart keys for my 06 mercedes. One

Customer Question

I have two identical smart keys for my 06 mercedes. One works fine, the other will open doors etc but will not work the ignition. New batteries for the one that doesn't work but still no ignition.
JA: Has the vehicle been scanned for codes?
Customer: yes
JA: What is the model/year of your smart?
Customer: 2006 E500
JA: Are you fixing your E500 yourself? What have you tried so far?
Customer: Only changing batteries in the smart key. Regular maintenance with my mechanic
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 1 month ago.
Category: Mercedes
Expert:  Marty replied 1 month ago.

Hi, my name is***** apologize for the long wait on this question. If you have 1 key that will not start the car you simply have a bad key. You can take the car to the Mercedes dealer and have them try to reprogram the key to the ignition switch using the Mercedes Star Diagnosis tester. If the key cannot be reprogrammed you will need to purchase a new smart key from the dealer.

Let me know if you need further assistance.