Question

On a 2006 BMW 330i where is the HO2S circuit fuse located?

Answer 1

It should be located in the fuse box, inside the car.  "The fuse box is accessed by flipping two white tabs on the "ceiling" of the inside of the glove box 90 degrees and pulling it down"

Open the glove compartment and turn the two white quick-release fasteners outward. Spare fuses and plastic tweezers are located on the fuse holder