We recently had Emissions Codes appear for two NOX sensors (I think there are only two). I have an 'automatic' ODB2 reader, and after it read the codes, I decided to clear them to see if they would re-appear. Some time shortly after that the dreaded 'countdown' started with 9 'cranks'. I took it to a local MB Sprinter dealer and he said the countdown occurred because I did not use an MB device to clear the codes, so the 'tamper' logic caused the countdown to begin. Also, because I cleared the codes the dealer could not prove what happened, so would not be able to cover the problem(s) under warranty. They updated the software and told me to being it back if it happens again. NOX sensor issues would not prevent me from continuing to drive the Sprinter.
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