If the engine is causing a knocking sound under the hood, then make sure that it has individual problems. When you are not replacing the damaged part, then the sound is replaced with repetitive tapping or pinging sound and that becomes louder and faster as you accelerate. Thus, the engine knocking noise from the Volvo XC40 can describe a variety of noises that can need immediate attention. Go through the following video to know about the common causes of knocking sound from the engine of Volvo XC40 in Green Bay.
https://www.youtube.com/watch?v=U-17t1-JSTA