Headlights need adjusting or bad headlight level sensor?

[marcce]

For as long as I’ve had my E92 M3 the headlight level has seemed rather low with a short throw. In comparison to my E38 projectors they don’t reach nearly as far, despite both being projector headlights.

How do I know if the headlight level sensor has failed or if I just need to manually adjust the height/throw of my headlights? I have had my level sensor fail on my E46 before and when that failed the headlights seemed much lower than my E92, so I’m conficted on the cause and solution.