How to troubleshoot a faulty engine in an Audi car?

My Audi's engine is not running smoothly and I've noticed a strange noise coming from it. What steps can I take to diagnose and resolve the issue?

First, check the spark plugs and ignition coils as these are often the culprits for engine issues. If they seem fine, move on to the fuel injectors and fuel filter. These can easily get clogged and cause problems with the engine's performance.

It's also important to check the engine oil and coolant levels. Low levels of either can lead to engine failure. Additionally, inspect the air filter and replace it if it's dirty. A dirty air filter can restrict air flow to the engine and impact its performance.

If all of these components seem to be in good condition, it's possible that there is an issue with the engine's sensors or wiring. I would recommend taking your car to a certified mechanic for a proper diagnosis and repair.