Hello dear community, I am desperate and urgently looking for advice on how to proceed. At the moment I have the problem with P0299, charging pressure too low. It happens again and again, but it is sporadic. Mostly when the car is warm and with high load in high gear. I got with a small readout device and followed it again and again charging pressure. So also today. Short distance, 20km driven, all top. Required charging pressure corresponds to the measured value. Car parked and 1 0min later continued driving, car was still warm, 20% of the charging pressure is missing. And so it happens constantly. As soon as it is so, I can provoke the error p0299 by accelerating under load. Otherwise I have error incandescent candle cylinder 3, but this should not have something to do with the topic. AGR was switched off because a previous error has not been found. AGR sensor B, sensor C, flow rate DPF was cleaned, valve lids replaced, injectors resealed. Nevertheless, I have a stand differential pressure of 15 mbar and under load this goes up to 300-400 mbar. Can it be that for any reason DPF does not regenerate and the charging pressure loss arises due to the counter pressure? Can it be that the DPF does not work due to shut down AGR? AGR is still displayed, however, with 25%. I have high pressure and low pressure AGR. How in which, whether both have been switched off by software, I can not say. End pipes on the exhaust already look pretty rusty Since I suspect the AGR cooler in AGR error, I got it and thought about replaying the original software. Because the first time the error came, about after 300Km, after the AGR has been shut down. Before that never came the error P0299 I offer suggestions.