Why does the Audi's engine produce unusual noises?

The engine of my Audi car makes loud knocking sounds when I accelerate. It also emits a strange smell. What could be the reason for this and how can I fix it?

There could be several reasons for this issue such as low oil level, worn out bearings, or a faulty exhaust system. It is best to take your car to a mechanic for a thorough inspection.

You may need to clean or replace your fuel injectors. It is recommended to do this every 30,000 miles to prevent buildup and maintain engine performance.