The control circuit board failed inside the left headlight. the left front turn signal therefore does not work, and the board is not available by itself. a year later (6/2019) the left rear tail light developed condensation and the brake light and turn signal failed. these are very common problems for this car and not repairable. officially a new headlight and new tail light would be needed. this would be approximately $2500+ for just one taillight and one headlight plus likely 5+hrs labor. it is very likely the right side lights will fail some day. turn signals should be repairable. the car is overall in excellent condition, but i am not sure a car like this should need $6000 in turnsignal repairs in its lifetime.
Factory headlights suffer from severe condensation. this causes poor road illumination and excessive diffraction of light. it also caused components to fail including the turning indicator leds that are built into the headlight housing. the tail lights suffered the same condition. causing indicators and brake lights to fail.