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.
Welcome to the forums.
When your fob didn't work did you try the keypad just to rule out an electrical malfunction vs. intelligent access malfunction? If you're ever locked out of your car, there's a physical key inside your fob. See your owner's guide for info.
If you have no further incidents of this type then it well very may have been outside interference. This is also explained the OG. The fact that you never had this issue with your Altima doesn't mean that this car won't. It's a different system.
Your dealer should be able to find what triggered the CEL in your car, as it sets a code in the car's diagnostic system. Yes, it's irritating but these things happen. My daughter's Mazda set a CEL when the car had less than 50 miles on it. Presumably, Lincoln gave you a loaner car.
Do let us know what they find.
Edited by drolds1, 29 July 2015 - 04:06 PM.