How do I troubleshoot a malfunctioning Audi engine?

I have a 2015 Audi A4 and recently the engine has been making strange noises and experiencing a loss of power. What steps should I take to diagnose and fix the issue?

First, check the oil and coolant levels. Low levels can cause engine problems. If they are fine, then it could be an issue with the spark plugs or fuel injectors. I recommend taking it to a certified Audi mechanic for a thorough diagnosis and repair.