Sometimes that smell is from oil that is on the engine and gets to the exhaust manifold. It could have been spilled during an oil change. Sport mode on the highway probably gets the engine hotter than your usual drive.
Sometimes the belts on an engine might smell, too.
I had a car with bad valve stems seals. It would smoke noticeably under a couple of condtions>
1.If the engine was thoroughly warmed up, shut down, then restarted after sitting a bit
2. After coasting down a long hill then when you touch the gas again.
The oil builds up in the cylinder head in...
How often you change the oil is about how much pollution (combustion byproducts, wear from metal parts in the engine, dirt passing through the air intake) accumulates in the oil, plus the oil gets worn out gradually from the heat and friction, etc., causing the oil to become 'thicker' but less...
I remember on a recent trip stopping several times and for some reason each time it took 11.2 gal to fill. Of course I don't want to completely run it out of gas but the manual says 15 gals I believe.
Not a lot of miles but I think some people have had some problems with the pulley. It might leak hydraulic fluid and you can see it. It's good to use a flashlight.
The water pump should last a long time so there's no interval, but a 2015 could have a lot more miles, that's why I asked.
The range computer changes its estimate of remaining miles according to recent driving habits and mpg. I've noticed that at times the estimated range has gone up, because I went from urban driving to cruising on the highway driving with better mpgs, causing the computer to re-estimate the range...
So, it's about 10 years old, how many miles?
Have you used a stethoscope or something to listen to the knock? Does the knock go away, or is it worse if you stop and idle after a long drive?
Have you ever replaced items like the water pump, or idler pulley on the serpentine belt?
It might be something unusual, critters are a possiblity, as this is the time of year they plan invasions.
Maybe a bad ground somewhere important, as all of the codes refer to various communication modules.
Do you drive through deep water on the way to work?
Are you having any driveability issues? Do you drive a lot of short trips and idle the engine a lot? If you idle the engine a lot you might be fouling the plugs without logging miles, so there is that to consider.
If you drive the car about 80mph on the highway for several hours it can help...
I think there is a screw in the armrest under a trim piece. I've never replaced the window switch but I think it is accessible when you get everything apart.
Breaking clips when you pop them out seems to be completely normal, I broke a few when I was installing sound deadening in the doors.