9 min read
The E46 headlight that works, until it doesn't: the adaptive-unit trap
Adaptive E46 bi-xenon units share their electronics with the beam levelling. Fit the wrong pair and the lamp lights but the levelling stops. How to check.
Blog · research notes
Articles about adaptive headlights
What we learn while building the configurators: changeovers, part families, the traps. Every article names its sources and how sure we are.
Try it on your car
See it on your exact car.
Pick your model, year and body style in the configurator and get the part that fits it, with the OEM number and offers side by side.
Open E46BUILD