Why is the BMW 1 Series engine making a loud knocking noise?

I recently purchased a BMW 1 Series and have noticed that the engine has been making a loud knocking noise. It seems to occur when I accelerate or when the car is idling. What could be causing this and how can I fix it?

It sounds like your engine may have an issue with its pistons. This is a common issue with the BMW 1 Series. I would suggest taking it to a trusted mechanic for a thorough inspection.

I recommend checking your engine oil level and making sure it is at the correct level. Low oil can cause knocking noises in the engine.

Have you recently changed your fuel type or brand? Sometimes using the wrong type of fuel can cause knocking noises in the engine. Make sure you are using the recommended fuel for your BMW 1 Series.