The stock tensioner is early TSI engines is very prone to failure. This part keeps tension on the timing
chain in your engine and ensures that it stays in time. A broken tensioner can cause slack in the chain
and be very prone to skipping a tooth on the cam gear and cause catastrophic damage to your engine.
This updated part has been released by VW because of the early failure-prone units.
If you have a TSI engine and hear chain noise or have high mileage, replace this inexpensive part now
instead of having to replace your costly engine.