I purchased my 2009 Jetta TDI brand new and it now has 49k miles. I opted for the modification as soon as it was available. At the end of November 2017, the check engine light came on with P2002 (DPF) code. The dealer didn't find any problems and forced a regen. All was well until the same situation happened this month. The dealer contacted VW as he couldn't find any problems other than a regen was needed. VW then instructed that I MUST drive "50+ miles at a time, at highway speeds, at least once per month" to create a regeneration. The dealer stated VW didn't want to cover this visit under the warranty but the dealer was going to "write it off" because they were unaware of this requirement also. Any one else had this situation? My Jetta would regen frequently before the modification. My driving habits haven't changed. I live in St. Louis where I would have to drive out of the metro area to get in 50 miles at a time!