How do I troubleshoot a faulty engine on my Audi A8?

I have been experiencing issues with my Audi A8's engine, and I am not sure what the problem is. The check engine light is on and the car is making strange noises. What steps can I take to diagnose and fix the issue?

First, check the engine oil level and quality. Low oil levels or dirty oil can cause engine problems. Next, scan the car's computer for any error codes. These codes can help pinpoint the issue. If there are no codes, perform a visual inspection of the engine components for any obvious signs of damage or wear. You may also want to take the car to a trusted mechanic for a professional diagnosis.

Make sure to also check the spark plugs and ignition coils. Faulty spark plugs can cause engine misfires, while faulty ignition coils can cause the car to run rough and have poor performance. If these parts are old or worn, consider replacing them. Additionally, check the air and fuel filters. Dirty filters can restrict airflow and fuel flow, causing engine problems.

If you have recently filled up with gas, it's possible that the issue is with the fuel itself. Contaminated or low-quality fuel can cause engine problems. Try adding a fuel additive, such as a fuel injector cleaner, to see if it helps improve the engine performance. It's also important to regularly maintain your Audi A8, including changing the oil and filters on a regular schedule.