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I haven't had the DEF message, but have had the past due on service message. I was still able to drive it with no issues even though the past due kept reappearing. When I talked to a MB service writer, he told me that the service message comes on after the time period has been reached no matter if the mileage still has a ways to go before an actual service is due. Usually the DEF message comes on if you let the DEF go to almost empty. I always refill just after I get to the half way mark. At halfway, I need to refill with 2 1/2 gallons of DEF to fill the tank back to full. It holds 5 gallons of DEF in the Sprinter.
Paul
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