Dont do it WJG, there is a serious risk your car will suffer from it. I have a VW with this engine so have been watching and searching on this subject for months. You dont say how old your car is but in general the older higher mileage cars have more problems than newer models, the smaller capacity units up to 1.6L are worse than the 2.0L. Thats just my estimation from reading hundreds of posts.
The service update removes the cheat but also retunes the car so that it can pass EURO5 test without it. Every variation of every model needs a different remap so its hard to predict for any one car what the effect will be. VAG have admited more soot is produced and the DPF regenerates more frequently due to greater use of the EGR valve. This has implications for the life of these expensive parts.
VAG are using a whole range of "tools" to achieve the NOx reduction, fuel timing, injection patern, injection pressure, turbo boost, EGR flow and possibly changing emissions sensors trigger pionts. If like mine your car has a SCR and AdBlue tank I believe the other changes may be less drastic than cars without this because the AdBlue can drasticaly reduce NOx on its own but will use more fluid.
Personaly I would like to get the fix done but will wait till I have confidence its not going to harm my car. If I cant get into that position I will get it done the day befor I part with it
Just for your information I phoned VW when I got the letter about 4 weeks ago and asked them directly if my car would suffer a reduction in low rev torque and power after the fix but they refused to answer saying " you dont have to get it done its not compulsory"
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