I would unblock it. It will not work. It can only be reduced with the software changes; not the VCDS (Vag-com) job.
What year is your van? You mention exhaust light (DPF), so I assume it is 2006-on.
Make sure you don't end up with damaged DPF box, if your van is under the warranty, the warranty could be voided, if the dealer would find out that you tempered with the vehicle emissions system.
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