Thanks for the response!

The one came on the car failed in 91 (6yrs) & was replaced. Than between 1991-2007...replaced three more times. Now the one that was replaced in 2007 failed yesterday (~3yrs/30342km). So a total four + the one came on the car..."FIVE".

During all those years, tensioners, absorbers, belts, etc. been replaced by the dealer, so I would think it's properly adjusted (sure hope so).

Please keep ideas coming, I sure want to find out the root cause. bc this part is dealer part only (no oem/aftermarket available) & it's $996.