I have an early 2020 GT with no issues and can not tell when CD kicks in or out. Even looking at the monitor it is hard to hear/feel a change. Due to Covid only 5500 miles mostly 10 mile trips to town.
Perhaps it is quicker and easier to have a robot apply the sealer than deal with a gasket that has to be positioned correctly for the bolt holes to line up during assembly
There have been several people who had replaced plugs that did not have the proper ion feedback and it created a lot of trouble codes so you can watch out for that. I remember a 2013 that replaced a lot of parts before he purchased oem plugs and the codes went away. I suggest you search for...
In order to tell which tire is low, the sensors have to be registered to the car by location so the car knows which tire location it is reading with a registration tool. Guess what, when you rotate the tires you have to reregister the sensor to the new tire location. I have a 2000 Corvette...
I think you are pulling the relay for the low pressure electric pump in the tank. I think the high pressure pump is mechanical and always pumps. Starving the high pressure pump may introduce air which can be a big problem. I would rather evaporate a few ounces of gas than to risk getting air...
Low brake fluid indicates significant pad wear, the fluid was needed to take up the space due to pad wear or a leak in the system. Did they check the pad wear?
I purchased a set of GT wheels when an accident ruined one of my rims and I found a guy replacing rims and tires so the set was only a little more than dealer cost to replace one. So, I have a set of 4 extra center parts at half retail if interested pm me.
Make sure your low beams are correctly adjusted. I found my 2016 GT to be too low and raised them a bit. If you find a level lot next to a building you can pull up close, look at the light cut line and back up and watch the line drop to the ground and adjust the distance that way...
If your old one was still working they could have put the glass part in the new housing. Recalibration is required if you replace/paint the rear quarter panel where the radar unit is located.
To stop my fob from getting bumped and opening the hatch, I took it apart, one step more than changing the battery and cut off the plastic probe on the back of the hatch opening button. I never used it anyway, always press the button on the hatch...