First of all, what is injector leak back? Leak back is the release of excess pressure in the fuel injectors that return the extra fuel back to the fuel tank. In other words, it can be thought of like a pressure check valve on the top of the diesel injector.
As I mentioned in the initial van post, there is a check engine light that needs to be figured out. And to help me do that, I picked up a Mercedes specific MBII Code Scanner that can read both standard OBDII engine codes as well as Mercedes specific codes. But I