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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 

Thought id add a PSA to this topic, to help those in the future from my learning the hard way.   Before you do anything with the new 4G modem on any level esp with forscan, go to settings and turn on vehicle hotspot, then connect to it from another device, follow the prompts to connect your car for in car wifi thru ATT, while it still is registering the old VIN, make an account and get car connected, and then once thats done proceed with any of the remaining steps.  If you dont you forfeit your ability to use in car wifi connectivity with the new modem.  once it registers your current cars vin it can no longer be searched for thru ATT system and ford wont help either if you ask them to reissue the vin as an active 4g vin.     If you dont plan to use the feature carry on, if you do, do it before it learns your vehicles vin number which happens pretty quick on its own.  even tho the vin changes on the modem ATT still communicates with it via the antenna and serial i guess, you just need the initial handshake to happen.  If you cancel your service at any time you can kiss it goodbye as well.  You dont need this connectivity for the remote features they still work without a flaw but the ATT connectivity was nice when traveling and my verizon was low on signal usually ATT was strong in those times.  

I just bought a 2011 with this issue, you guys are very helpfull and i will be on here alott.

Hello.  My 74yr old mothers 15 2.0t mkz recently started having this problem.  77k miles   When engine is started and in gear, she says it will die when she tries to drive off.  She puts in P and restarts fine.  Once driving it's fine.  Happens frequently but not everytime.   I drove an could not replicate anything. I scanned for engine/trans codes.  None present.  Battery good. Terminals tight.    Anyone else have this problem?

Mine is just squeaking, you think a spray of WD-40 to that center metal piece would be a good start?