Hello, My 2011 Golf TDI has been throwing the OBD code P047F -- "Exhaust Pressure Control Valve: Stuck Open" for some time now. I understand that the exhaust pressure control valve or “flap” on these cars was not exactly designed the best and often sees issues with being stuck open and/or closed. I know that VW offers an extended warranty (http://pics.tdiclub.com/data/500/VWP1305_Engine_Exhaust_Flap_Limited_Warranty_Exension_2.pdf) to replace these issue-prone exhaust flaps with new ones. Given that I don’t presently have access to the tools and work space to fix it myself, I think I’d like to take advantage of this extended warranty and have VW replace the exhaust flap, mostly because I don’t want the malfunctioning flap to cause any engine damage. My only concern: Though I’m pretty sure this fix shouldn’t require any modification to my engine control module’s software, getting this fix done still gives the dealer access to my car’s OBD port and ECM, and I’m unsure if the dealer may (under pressure from the EPA, etc.) try to install new ECM software to lower emissions at the expense of reducing fuel economy. Is this something I have any legitimate reason to be concerned about? Can a dealer update my ECM’s software without me knowing? As I recall, one such update, for some models, included "ECM Software Update REPAIR NEEDED" VW Action Code "23O6,” but to my knowledge, my car never had this done. Note, I don’t have any aftermarket tune, so at least that shouldn’t pose any issues for the dealer. One solution I’ve considered: block off my car’s OBD port… problem is, the dealer needs to access the OBD port to verify what code is being thrown. Thanks in advance.