A good one at idle would be 10mb or less bring revs up to about 2500rpm and less than 100mb flat out under load and 300mb max.
Bmw dpf back pressure sensor.
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Flow sensor lambda nox sensor bumper parking sensor tyre pressure sensor mass air flow meter sensor maf sensor exhaust pressure sensor engine exhaust back pressure sensor wheel speed sensor lateral acceleration sensor a b s.
You would normally measure dpf pressure in mb.
I needed to check if it was indeed blocked and the first back pressure reading showed exhaust gas back pressure at 940m b at 2 000 rpm.
Old sensor is showing 12mbar pressure with hose disconected i replaced it with new one from hella and is showi.
There are several possible reasons why a dpf could be showing a reading like this.
Sensor abs wheel speed sensor acceleration yaw rate.
Next we simply tested sensor plausibility which showed a reading of 0 m b with ignition on engine off.
300mb is about 4 5 psi.