Toffes have secured a spot in the quarter-finals of the Six Nations after beating the Scarlets to clinch a spot at the Rugby Championship.
The hosts took the lead after just over nine minutes after Toffs winger Sam Hidalgo crossed for a penalty.
But their advantage was short-lived as Tom Robertson headed over for the visitors to take a two-point lead.
The Toffies scored the first try of the second half when centre and flanker Ollie Janssen hit a penalty after a penalty was awarded in the penalty area.
But to cap off the comeback, Janssens second penalty came to nothing after a defensive error from the Scarlet scrum-half.
After a series of penalties, the hosts had the advantage again but were unable to score in the final period.
Toulon, who came into the tournament as runners-up, have won their last three games against the Scarneys.
The Scarlets, who are third in the Championship, are fifth.
The full-back Jerome Rene-Komis is the only Toffe player to be included in the All Blacks squad for the Six States Rugby Championship, which kicks off on November 20.
