Lewis Graham, 19, was last seen when he left his home about midday in his modified Nissan Patrol 4WD.
Later the same day the teenager from Orange sent a photo he’d taken from the entrance of the Mullion State Forest to a friend, via social media. The young man has not been heard from since.
Police have great concerns for his welfare.
When last seen he was wearing thongs, shorts and a T-shirt.
Police are combing the Mullion State Forest using officers and PolAir. They are seeking assistance from anyone who may have seen Lewis, or may have information about his whereabouts to contact Crimestoppers immediately.