Bmw Dpf Back Pressure Sensor Readings

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 readings.

Active reads the back pressure of the exhaust or soot load of the filter to determine when to begin the regeneration. The 3 readings above confirm the usual 480a 481a dpf fault and exhaust back pressure faults sadly all too common. You would normally measure dpf pressure in mb. 300mb is about 4 5 psi.

The car in question is our bmw x5 3 0d when you are at wot the pressure before the dpf peaks at around 480mbar. The sensor monitors and measures the pressure with the egr valve. During an active dpf regeneration you may notice the following. The differential pressure feedback exhaust sensor or dpfe sensor is part of the vehicle s exhaust gas recirculation egr system.

While there seems to be benefits to these computer manag. When i do the dpf back pressure test with the just the engine running and no driving i have approx 12mbar at idle 55mbar at 2000rpm and 100mbar at 4000rpm these results are roughly half the bmw max recommended value. Next we simply tested sensor plausibility which showed a reading of 0 m b with ignition on engine off. 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.

Common rail diesel engines have become more common in passenger vehicles in the past decade or so. As you can seewhen looking at the back pressure result below it was non too promissing. There are several possible reasons why a dpf could be showing a reading like this.