Why is my BMW X2's engine making a rattling noise?

I recently noticed that my BMW X2's engine is making a loud rattling noise while idling. It seems to go away when I accelerate, but comes back when the car is at a stop. I'm worried about the health of my engine and want to know if this is a serious issue.

It's possible that the rattling noise is coming from a loose or worn out belt in your engine. This could be a sign of impending failure, so it's important to have it checked by a mechanic as soon as possible. It's always better to address potential issues early on before they become more costly and difficult to fix.

Another possibility is that the noise is coming from the timing chain or tensioner. This is a common issue in BMW engines and can be quite expensive to repair. I suggest bringing your car to a trusted mechanic for a diagnostic test to determine the cause of the noise and the best course of action.

If you notice the rattling noise only when your car is cold, it could be a sign of a failing valve lifter. This could lead to engine damage if left unchecked. I recommend bringing your car to a dealership or a BMW specialist for accurate diagnosis and repairs.