How do I troubleshoot a faulty engine in my Audi A4?

I've been noticing some strange noises coming from my engine and my car seems to be running less smoothly. What can I do to diagnose and fix the issue?

Check for any warning lights on your dashboard and consult your car manual to determine what could be causing the issue. You can also try taking your car to a trusted mechanic for a professional diagnosis.

Make sure to regularly maintain your car by changing the oil, filters, and spark plugs as recommended by your car's manufacturer. This can prevent many common engine issues.

If you suspect that the issue may be related to a specific part, such as the alternator or fuel injectors, try replacing it to see if it improves the engine's performance.