What are the most common engine problems in the Audi A4?

I recently purchased an Audi A4 and I want to know what are the most common engine problems that I should watch out for?

One of the most common engine problems in Audi A4 models is the failure of the ignition coils due to heat and vibration. It's important to regularly check and replace these coils to avoid engine misfires and loss of power.

Another common issue in Audi A4 engines is the failure of the timing belt tensioner which can lead to catastrophic engine damage if not addressed immediately. It's recommended to replace the timing belt and tensioner every 60,000-90,000 miles.