exhaust back pressure OM642.990, 3.0 CDI, 204 hp, built in 2009

Hello, someone can tell me the target value of the exhaust backpressure in idle mode, or also when accelerating. I have 1600 hPa at idle, or 4000 hPa at accelerate.For engine from 1040hPa,so sensor in order. That seems to me too much. Particle filter is regenerated, so according to the tester free.