I have to clarify this issue. It seems that the M112 a manufacturing defect?

Many cars on the same symptom

What that problem is what happens when a car engine I hear a knock knock.

What makes the sound?

It is not normal that a bit driven cars to Knock Knock, which in this case, the manufacturer's responsibility?

How loud is your car knock knock noise hookedon210s? and only gear D and R ? if you do exactly the same symptoms as mine problem?