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Well, in that case, not only look at vac lines , but also check the air tube that is between the engine and the MAF sensor I am not familiar with the VW set up , but if any clamps or other sensors [ like Air inake temp, etc.] plug into this tube, they have to be tight or back in place or else unmetered air [ meaning air that can get to engine without going through the MAF sensor to be measured ] will bring up your lean code condition. Go recheck the parts you know you took off when changing the plugs and such...
If you find nothing , then as W Bain says , VW forum will know more than us Benzheads on specifics ..give them a model/year and they may point you right to the exact cause , whereas here we are speaking generic 0BD2 possibles,,
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