I bought my 2015 MKZ two weeks ago, and less than a week after having it I had the same key fob issue. I was at my hairdresser's and brought him outside to show him the car and couldn't get the doors to open. After numerous times of hitting the button on the remote it finally opened. Then once inside the car I couldn't get it to power on, still said no key detected. Just kept hitting away at the buttons on the remote and it finally recognized I had the fob and I was able to get it to start. Then the message came back on saying no key detected, but it was running so I was able to drive home. I took it in for service and was told they could not find anything and brushed it off as potential outside interference. Which I find odd because I also own a 2007 Nissan Altima with a key fob, and in the 8 years I've had it I never once had that issue. Then the day after my service appointment for the key fob, my check engine light came on. Car is back in the shop today. I have a feeling the response is again going to be they couldn't find anything. I am not happy at all to have my two week old car in the shop for a second time.
