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Hi Jdsander. Can't believe they even recommended that. 🙄   As long as the CEL is not flashing, simply drive and run the tank down to half or so and fill it with regular. Then do it again. That will sufficiently dilute the premium fuel. Therefore, if it is an issue with the premium fuel (I highly, highly doubt it), then it should fix itself with one half tank fill-up. And after some driving with no misses or other related issues, the CEL will reset itself.   I am sure others will jump in with more advice, so keep us updated and good luck.

The P0300 engine warning is showing up on a 2017 MKZ 3L AWD. Warning light is on but not flashing. The dealer has had it for the third time as of now, occurring over less than  a month. The first time out they replaced coil packs and spark plugs  . Second time did a bit of "computer programing". The third time is on-going. Otherwise it runs fine, does not seem to affect performance (earlier in Dec did a road trip to AZ through TX with some very long straight stretches posted at 80 mph, it ran fine). The error code shows up on start up. I may notice a faint, really faint (not even like a bad spark plug wire on an old V8) miss early after start up if I am outside the car.  They have reset the codes and P0300 returns after driving it for maybe up to 100 miles. Total mileage on it is around 120K.  Any input would be appreciated. Just an update: service rep calls he conferred with the tec and their verdict is: The premium fuel is the issue it has a higher flash than regular fuel causing it to have a lean condition and they would need to suck the fuel out at a cost of $600 dollars and fill with regular? Now this is at a Ford dealer. My thoughts are not even printable.

I also suffered this.  My 2020, which was 5 months outside of it's OEM warranty and within the Certified Pre Owned warranty had it happen one day on the way home.  Made a horrible noise, then stopped the roof from opening.  Ford won't cover it on the Lincoln Certified preowned warranty they love to charge you so much for.  The dealer quoted me $1200 for the part (which is more than MSRP) and $2800 in labor to replace it.  I told them they were crazy.  The car has 24,000 miles on it.  Needless to say, Lincoln lost my future business.  Not that they have anything left I'd want only selling SUVs.  The worst part is that it is a well known issue among those of us who use online forums but Ford claims it never happens.  Funny never and all these people posting about it don't match up.  Cadillac, here I come.

So my panoramic roof won't close now.  The last time I tried to use it the liner wouldn't retract and got bunched up and got jammed into the track.  I was able to close it a little but now it seems like the liner is stuck.   Does anyone have any input as to how to proceed?  Does this liner get rolled up and the motor is bad?

In haste my mechanic removed the undercarriage shield from the rear part of the car a couple years back because it did not have anywhere to hold onto. I driving frequently and longer distances in cold areas with much salt. Today I noticed that there was a plastic box that broke away and hitting the ground attached by some wires. The bolts when I took a look had broken loose due to corrosion and there is no where to attach back. How would you improvise this? And what is the box anyway? I did not get any error codes or alerts on the dash. 

Hi Greg and welcome to the Lincoln MKZ Forum. Did you have a question or concern?   Let us know and good luck.

Why did this become a thing, when we went from 1 to 2 or to 3 I don't remember seeing this.... just wait till we go to 5 and leave 4 in the dust...!!!!

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Hi Slick and welcome to the MKZ Forum. Not much I can recommend by blind Internet diagnosis, other than have you performed all required maintenance for the current and previous age and mileage of your vehicle (as per the Maintenance Schedule)? Changed plugs etc?    A related question/questions though: How long do you normally sit and wait for the vehicle to warm up? Do you normally wait 15 minutes or is that a remote start observation?  The reason I ask is...It is not necessary to sit and wait very long. As per Lincoln/Ford, a 15-20 second wait, then drive, is sufficient and also most efficient for vehicle warmup. Just start the vehicle, put on our seatbelt and do whatever else we normally do before driving away. By that time, 15-20 seconds has gone by and we can drive away.   If you have performed required maintenance and still believe you have an issue, it may be best to have a shop/tech you trust take a look.   I am sure others will also jump in to help, so keep us updated and good luck.

So I’m having problems with my 08 mkz. Only when cold start. Won’t idle down for almost 15 minutes. It just started doing this since it is cold outside any ideas would be great