The visitors took the lead in the 23rd minute when Adam Maher collected the ball inside the box and fired a low effort past Hansen.
ADO Den Haag responded immediately and were awarded a penalty which was converted by Roland Alberg to level the scores.
In the second half, Davy Propper almost handed his side the lead once more when he drilled a low strike at goal, but Hansen made a fine stop to beat the ball away.
The visitors did retake the lead when De Jong found the net as he latched on to a cross at the back post and guided his header beyond the reach of Hansen.
PSV looked to be set for their first win of the season, but Hansen went up for a free kick in stoppage time and flicked the ball with his heel through a crowd of players before nestling into the bottom corner to earn the hosts a point.body check tags ::