I am having a similar problem with my 2007 Audi A6. The "advanced" key does not get recognized by the car every time and I have to use it as a "standard" key in order to start the car or lock it. When trying to start the car using the start button, I get the message "No key recognized". I've only had the car for 8 months and the remote buttons work fine, so I am sure it is not the battery. Any hints at all would be helpful as I dread taking it back to the dealer as the problem does not occur every time.
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