What are some common issues with the engine of an Audi A4?

I've been experiencing some problems with my Audi A4's engine lately. Can someone help me identify some common issues and provide some advice on how to maintain the engine properly?

Based on my experience, one of the most common issues with the Audi A4 engine is the timing chain tensioner failure. It is important to regularly check and replace the timing chain to prevent any major damage to the engine.