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Welcome to  the Forum, @David Brent Grider!   Your concern is especially reasonable if this harsh transmission engagement symptom has not previously occurred in your Nautilus.   However, the symptom is likely due to the extended period of time your Nautilus' battery was disconnected during the fog light repair.   Battery disconnection can affect the Transmission Adaptive Table values that your Nautilus's electronic modules utilize for the transmission's electronic controls.   Below is a procedure from the 2019 Nautilus Workshop Manual which you can employ toward likely restoring your Nautilus' transmission engagement and shift point performance.   If you are not comfortable with any portion of the procedure(s), you may consider taking your Nautilus to the dealership, where the Service Technician will likely perform the same procedure(s).   Be mindful of your choice of roadway and observant of your surroundings when performing the described acceleration and braking routines, in order to ensure the safety of yourself and others in the vicinity...   Adaptive Learning Drive Cycle Configuration NOTE: The engine and transmission must be at normal operating temperature. Using the scan tool, clear the DTC and Transmission Adaptive Tables. Bring the transmission to normal operating temperature. With the engine running and the brake applied, select the gears in the following order, pausing in each gear for 4 seconds: N, R, N, D, R, D, N. Repeat this pattern 2 times. If any engagements feel soft or harsh, repeat this procedure. Drive the vehicle and accelerate at a moderate throttle so that the upshifts occur at 2,000 rpm up to 100 km/h (60 mph) and brake moderately to a stop. Repeat this pattern 2 times. Drive the vehicle and accelerate at a moderate throttle so the upshifts occur at 3,000 rpm up to 100 km/h (60 mph) and brake moderately to a stop. Repeat this pattern 2 times. With the engine running and the brake applied, select the gears in the following order, pausing in each gear for 4 seconds: N, R, N, D, R, D, N. Repeat this pattern 2 times. In all likelihood, based upon the repair history you describe, the above procedure may eliminate the harsh engagement symptom.   If it does not correct the issue, you could try performing this next procedure, also from the 2019 Nautilus Workshop Manual, to perhaps set Diagnostic Trouble Code(s) that may help identify conditions contributing to the symptom(s).   Once again, if you are not comfortable with any portion of the procedure(s), you may consider taking your Nautilus to the dealership, where the Service Technician will likely perform the same procedure(s).   Road Testing Vehicle Shift Point Road Test NOTE: Always drive the vehicle in a safe manner according to driving conditions and obey all traffic laws. Upshift Gear Sequence At times the 8-speed transmission may skip gears when the vehicle starts from a complete stop. This is normal and desired behavior. At part pedal when acceleration is brisk, single step upshifts would result in very frequent shift events (very short time in gear). Double step upshifts results when a longer time is spent in gear. However, at light pedal or road load, single step upshifts will occur. The small 8-speed gear steps allow the engine speed to drop to lower values than it would in the 6-speed transmission; providing for the best fuel economy. In contrast, when the 8-speed transmission is at heavy or max pedal, the small steps keep the engine closer to the horsepower peak for best performance. Downshift Gear Sequence At times the 8-speed transmission may skip gears when the vehicle downshifts to a complete stop. This is normal and desired behavior. The same skip shift strategy that is used for the upshift may be applied during downshift.   Most performance based automatic transmission DTC s require the fault to be detected consecutively multiple times (up to 5 times) before setting a DTC . Performing the shift point road test as detailed below increases the likelihood that a DTC sets if a fault is present in the system. Shift Point Road Test Bring the engine and transmission up to normal operating temperature. Operate the vehicle with the selector lever in the D position. From a stop, accelerate the vehicle to 80 km/h (50 mph) with the shifts occurring at approximately 2,000 rpm. Stay in 8th gear for 30 seconds or until the TCC applies. Repeat this two times. From a stop, accelerate the vehicle to 80 km/h (50 mph) with the shifts occurring at approximately 3,000 rpm. Stay in 8th gear for 30 seconds or until the TCC applies. Repeat this two times. If the transmission fails to upshift/downshift, REFER to: Diagnosis By Symptom (307-01B Automatic Transmission - 8-Speed Automatic Transmission – 8F57, Diagnosis and Testing).     Shift Speed Chart   Shift Speed 1-2  6 mph (10 km/h) 2-3  9 mph (14 km/h) 1-3  10 mph (16 km/h) 3-4  16 mph (26 km/h) 4-5  22 mph (35 km/h) 5-6  29 mph (47 km/h) 6-7  37 mph (60 km/h) 7-8  45 mph (72 km/h)     Attached below are PDF versions of both these Workshop Manual procedure, for you to print and/or save for future reference.   Good luck!   Adaptive Learning Drive Cycle - General Procedures - 8F57 Automatic Transmission - 2019 Nautilus Workshop Manual.pdf Road Testing Vehicle - Diagnosis and Testing - 8F57 Automatic Transmission - 2019 Nautilus Workshop Manual.pdf

I would try a wash and hand polish. I use mostly Adam's Polishes and have used this product before so that's my suggestion. Any light polish should work though.    https://adamspolishes.com/products/adam-s-revive-fine-hand-car-polish?_pos=1&_sid=25c2bdc8d&_ss=r

almost new 2-3 months old

Sorry if this is not the appropriate forum for my situation, but it's the closest I can find. I have a 2019 Lincoln Nautilus Reserve, 6-cylinder. I had the battery disconnected while the front fog lighting was replaced due to an accident. When the vehicle was repaired and the battery was connected I got this BMS fault. I followed the procedure, as described here, and got the results that were expected for a BMS reset. The battery fault light on the dash blinked 3 times indicating a reset.  When I tried to drive the vehicle I got a hard bump when shifting into drive which indicated to me that things weren't right. I have parked the vehicle and I am charging the battery. It has now sat for the 8 hours that I have read is needed for a reset.  Can you advise me what I should do now? 

Thanks! I will pass this along — whatever the problem is, it’s a common 2016 Ford Edge problem (and maybe Ford Edge problem in general), but the guy who’s going to work on my car, has the exact same problem going on with his wife’s car (2016 Ford Edge). 

I had a 2016 and received a letter from Ford addressing a possible cracked flywheel. If you can find that it might help. 

I have a 2016 Titanium that has about 110K miles and essentially have had not real problems with the car except some problems with my liftgate in 2022; however I have started having problems for a while now with a noise coming from my engine / transmission, maybe and would like some suggestions on what to suggest to my mechanic to check out.   Here’s what happens:  it seems as though when I accelerate sometimes I hear a noise in the front end (maybe engine) and I don’t usually hear that noise again until I take my foot off the accelerator. I noticed this weekend for the first time that my car was making that noise when I would resume my cruise.  I can accelerate, take my foot off, accelerate, take my foot off the pedal and I will hear the noise.  It’s more of a creaking type noise than a pop popping noise.    There’s no jerking in the car that I can tell — I don’t feel it in the steering / or accelerator.    Any suggestions?

My 2013 Lincoln MKX is doing this, too!! It did it a year ago, too. I had the O2 sensor replaced and it was fine until now. I'm so frustrated. My car gets regular pm. 

What do you mean by designation on the part itself? Was ML3T-15K619-JA on the sticker of the part, but ML3Z-15607-K was on the website?