It happend yesterday, i had the car up on a ramp and removed the undertray. The tensioner roller has come of the main body of the tensioner, the belt is still intact its just the tensioner. Looking at it i see there are three 13mm bolts holding it to the engine block, the bottom two can be got at but the top one i cant get at, so i will leave it to the pros. My question is how much work is involved and is it an expensive exorcise?? Has any one had this happen to them before? Thanks for any responces.