My burnt headlight bulb, to be exact.
The one that burned out was on the drivers side, which is also where the battery is. I wound up having to go under the wheel arch to get to it. I also decided to change the other one because I’d like to have two brand new bulbs instead of one brand new bulb and one that isn’t so new.
Speaking of which, the passenger side bulb took me less than a minute, whereas the other one took a whole millennia not really.