What does the warning yellow warning light circle with 3 dashes on the left and right sides of the circle on aBMW 3 series?

Answer 1

This is the Bulb Warning Light;

Meaning the vehicle has a faulty bulb, on the exterior or of the vehicle. Check all of the lights (with ignition on);

Front + Rear side lights

Front Headlights

Front high beam

Front +Rear Fog Lights

Front + Rear Indicators

Rear Stop lights (including high level/ centre stop)

Number plate lights

And, Reverse lights.

Replace the necessary bulbs, recheck all lights, and the light should disappear.