Brennan
Former Audi Driver
So im thinking of a xenon headlight upgrade for my B8, it has standard halogens. I know some coding needs to be done on VCDS to accept the new Xenon bulb/LED DRL, but my idea is to switch back to the halogen units for MOT. Once coded for the new xenon headlights, would the halogen units work if i put them back in, or would it have to be coded back to halogen again?