How to troubleshoot engine problems in an Audi A4?

I recently purchased an Audi A4 and noticed some engine issues. How can I diagnose and fix these problems on my own without going to the dealership?

First, you should check the engine oil level and make sure it is at the right level. Low oil can cause a variety of engine issues. If the level is low, top it off accordingly.

Next, you should check the condition of the spark plugs. If they are dirty or worn out, they could be causing the engine problems. Replace them if necessary.

If the engine is making unusual noises, it could be a sign of a more serious problem. I recommend taking your Audi to a trusted mechanic for further diagnosis.