Had problems with the AGR valve a year ago. The old Swede suddenly had a strong power loss on the highway and allowed almost no acceleration. The next day everything was normal again, only when the engine was warm and for a longer time again was demanded like e.g. highway or free country road, again the problem. This game repeated several times. Error reading -> AGR valve. I make it short, it became expensive, actually too expensive for an old Sweden But I had it done anyway. AGR valve and AGR cooler had to be exchanged, plus the vertebra valve…a nice four-digit amount was then on the bill.