Headlight Issue

The system itself is not real definitive in the diagnostics. In most cases it states replace the arc tube(bulb/igniter), and if the problem is still present replace the ballast. This can be expensive, if it is not the arc tube. The best way I can suggest to isolate it, is switch the arc tubes from right to left and vice-versa. If the problem occurs on the opposite side, replace the arc tube. If it is still a driver side issue, replace the left side ballast. This is a bit more labor intensive. You are going to need to loosen the fascia to access one, you might as well remove the fascia to access both, and be correct in the diagnosis.