foursprungducktechnique
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The real crackdown on emissions started in 2009 with the euro 5 level which had significantly harsher targets to meet than euro 4 (2005)
The introduction of DPF filters around that time (probably) helped the older engine (which was basically the 1.9 TDI PD from the very late 90's) meet this one, but not a lot could be done to meet euro 5 targets with that architecture, so they cheated to do so.
It's possible something could have been done to cheat euro 4 also, but I doubt anyone would have stomach to dig that deep to investigate. Most of the cars would have depreciated to a level where no one is going to loose a great deal over them and how can you test the emissions on a engine that is over 6-7 years old...
Its easy to find out and test there's a problem with the euro 5 cars as they are still selling them new at the moment!!
As some people have already mentioned VW got greedy and thought they could get away without developing a new engine - until the writting was on the wall and the new euro 6 targets necessitated the EA288.
I may be barking completely up the wrong tree but that's how I read it anyhow. Only time will tell.
The introduction of DPF filters around that time (probably) helped the older engine (which was basically the 1.9 TDI PD from the very late 90's) meet this one, but not a lot could be done to meet euro 5 targets with that architecture, so they cheated to do so.
It's possible something could have been done to cheat euro 4 also, but I doubt anyone would have stomach to dig that deep to investigate. Most of the cars would have depreciated to a level where no one is going to loose a great deal over them and how can you test the emissions on a engine that is over 6-7 years old...
Its easy to find out and test there's a problem with the euro 5 cars as they are still selling them new at the moment!!
As some people have already mentioned VW got greedy and thought they could get away without developing a new engine - until the writting was on the wall and the new euro 6 targets necessitated the EA288.
I may be barking completely up the wrong tree but that's how I read it anyhow. Only time will tell.