hi, my van is throwing a 106200 code "the lower limit value for long term adaptation of exhaust aftertreatment system was dropped below". anyone have an idea what it can be. i suspect the smaller dpf pipe from engine bay to tank has a leak as it was kinked. I have it on order at the dealer. I erased the fault code but the check engine light never goes off and after a short drive code is back. any help would be appreciated