What is the most common cause of engine failure in an Audi A4?

I've noticed that my Audi A4 has been experiencing engine failure more frequently than usual. What could be causing this issue?

The most common cause of engine failure in an Audi A4 is due to an issue with the timing belt. It is important to have this part checked regularly and replaced if necessary.

Another common cause of engine failure is due to a faulty oil pump. It is important to have the oil pump inspected and replaced if necessary to ensure proper lubrication of the engine.