Hi! I have an ML 320 1999. Suddenly I found two of the light bulbs in the front panel close to speedometer are out. Also the the power source (cigarette lighter) near passenger side knee hole is out. Is it a fuse problem or light bulbs are to be replaced?

I would attempt bulb replacement first, check the fuse for the cigarette lighter, that may be separate, but I doubt the lighter and just two bulbs would be on a circuit by themselves. May be a combination of bad bulbs/fuse out, or the fact that the bulbs are out may be enough to break the circuit if they are connected to the cigarette lighter, causing it not to work.