Went this morning to MB dealer for the Emission Mod. Was told it will take all day and may go into tomorrow. Cost could be up to $3,000 dollars or more. I have to pay the MB dealer and get reimbursed from MB.
Left because I had plans for later today and tomorrow.
Not sure when I will have time to get back.
Speed sensors parts are not yet available.
The AEM service is free, look your vin number in the MB website. Dealer knows in details once they plug your van into their system but this service is free, unless there is something wrong with your current van which needs to be fixed. Usually it takes 4 hours. For example, if you DEF heater or SCR is not working, warning light is on, you need to fixed it first and pay for it, then they can do the AEM service for free.
Once it is fixed you need to claim whatever MB owes you up to $3.4K. You will get extended warranty as well. https://secure.mbbluetecsettlement.com/
Extensive writing is on the Sprinter forum. https://sprinter-source.com/forums/index.php?threads/89779/