New Serpentine & AC belt, new spark plug issues

[chasers36]

Hi All!


I'm hoping everyone is surviving the cold snap, unlike my beautiful X5.


So, just yesterday, I had my local BMW shop put on a new serpentine and AC belt, along with new Bosch spark plugs. I also had him replace the upper radiator hose, due to it leaking, and he also installed a new clip for the trans cooler lines. I drove it home yesterday from the shop with no issues. But it was tonight, in -20F weather on my way to work that I noticed not all was well after my visit to the mechanic.


I stopped at the gas station, and started smelling burning rubber. I quietly panicked, and somehow convinced myself that it was OK and to attempt to drive the 35 minutes to work, and it's just the new belts getting adjusted to their new engine ahahahahaha


I was cruising at 40mph when the check engine light started fast blinking at me. Then the engine started cutting out and losing power. I quickly stopped along the side of the road and popped the hood, only to be greeted by terrible acrid rubber burning and smoke. I attempted to locate the source with my limited visibility, but couldnt find it. I slowly limped it back home, and pulled the codes, posted in the picture. I'm very concerned that my mechanic accidentally swapped my o2 sensors when gaining access to the trans cooler line clips, and i'm also very concerned about the misfire, being new spark plugs. But also, REALLY concerned about the burning belt. I tried starting it again after i got home and waiting 30 minutes, and when i started it, it made a really whiney noise that didn't stop for about 15 seconds, then it went away, but the belt smoke started. I shined a light from below, and the belts are moving, and the tensioner and pulleys all seem to be spinning, but I can't tell if they're spinning at the correct speed or where the smoke is coming from.

I'm afraid to drive it at this point, and will likely need to tow it to my mechanic again, since he's 15 minutes down the road. I'm leaning towards the new belt being no good, which are not OEM, and now i'm kicking myself in the ass if that is my issue. Or an accessory/tensioner/pulley has gone bad, or the belt isn't tensioning correctly. Which is my most likely culprit here?