How to Check the Timing Chain Data of EA888?

[SanTalia]

EA888 second-generation engine's timing chain (due to material and other reasons) is prone to stretching after approximately 80,000 to 100,000 kilometers of use. Once the chain stretches, it is highly likely to "skip teeth," leading to a piston-valve collision (where the valves and pistons move out of sync and collide). Additional Information: Inspection Methods: 1. Use a Volkswagen diagnostic tool to access the engine system and observe the data stream in Group 91. If the data deviation exceeds approximately 5 degrees, the timing chain needs to be replaced, along with the chain tensioner. 2. Pry open the rubber cover on the lower side of the chain cover and inspect the tensioner. A normal tensioner's teeth should extend about 3 to 4 notches. If more than 7 notches are exposed, it indicates that the chain has stretched, requiring replacement of both the timing chain and the chain tensioner.