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Interestingly, I never got this one after blocking my EGR. Have 4B82 all the time, but not the 81. And, on my trip in the mountains the other day, i get it with the engine at the reduced power. Come home, scan it and it is 4B81. I think I also gave it a bit too much on a not fully warmed engine. I have reset it now and today it has not come back yet.
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