Why does my Audi A7's engine make a knocking noise?

I recently bought an Audi A7 and the engine is making a knocking noise. What could be causing this and how can I fix it?

There could be multiple reasons for your engine making a knocking noise. It could be due to low oil levels, worn out engine bearings, or spark knock. It is best to take your car to a certified mechanic for a thorough diagnosis and repair. In the meantime, make sure to check your oil levels regularly and use a higher grade fuel to reduce spark knock.

I had a similar issue with my Audi A7 and it turned out to be a faulty fuel injector. It's important to get this fixed as soon as possible, as it can cause damage to your engine. I recommend taking it to a trusted mechanic who specializes in Audi vehicles.

I would suggest checking your engine's oxygen sensors. If they are faulty, it could cause the engine to run too lean or too rich, resulting in a knocking noise. A certified mechanic can easily replace these sensors for you.