I think that it's indispensable to have an OBD scanner in your van at all times. You may be on a long trip when the Check Engine Light (CEL) comes on, and you don't know how severe the issue is. It could be something major, in which case you shut off the van, get a tow truck, and your trip is over, or it could be something minor, in which case you can disregard the fault and continue on your merry way.
There are many scanners out there, and several people are happy with their BlueDriver OBD scanner. I selected the iCarsoft MBII Scanner because it appeared to be the most full-featured for the Sprinter and it also allows the user to reset fault codes, which can save you an expensive trip to the dealer to turn the CEL off. I've used it a few times with good results.
If you get a fault and the CEL come on, it can be a little tricky to wind your way through the byzantine menus. Here is a visual guide to the path, compliments of Rajeev in the Facebook group.
