I do have a delphi tester but now i am using bimmer tool app and there at the dpf back pressure sensor calibration it ask me to add min value and max value for calibration, the min is 0 and max is 50 pha , the question is do i really need to calibrate the new sensor that i have changed ?? The DPF is regenerating as it should be , i have tested after the sensor replacement , at 3800 RPM has 72 pha