Hi guys, I have the same warning on my dash check brake lights, and check tail lights
This warning started about a month ago, no trailer tow like OP.
There is a way to test lights with INSTA D. My test showed "faulty" left brake light, but LIGHT is still good when I use Signal, brakes etc.. no visible fault,
Can or is INSTA D predicting a failure before it happens? Not sure, just sharing my story.. thanks 2006 x5 3.0i