Drinking too much
beer in Munich ;)
Join Date: Feb 2012
Location: I would rather not say
Yes it's between the fuel filter and the coolant expansion tank, behind the glow plug relay.
Important to note if it has two pressure pipes or one. My only experience with dpf's is with the 'distant coupled' type with one pressure pipe (the unit fitted below the gearstick/handbrake)
All sensors age and can drift out of calibration, but the sensor should produce a reading of 0mbar ( or even less) with the engine off....it's the same with VAG, Fiat and Ford and all others - with the engine off there should be no pressure.
100mbar at 3000rpm is towards the high end of where I would want it to be. With a partially drilled dpf I had 36mbar and another forum member had 45mbar at 3000rpm with a completely standard car.
Pity I'm not at home or else I could capture the OBD command to reset the differential pressure sensor and you could have entered it via hyperterminal, to save buying the registered version.
With clear pressure pipes it would be safe to assume that some sensor ageing is at work and now has about a 10mbar offset, meaning the peak pressure at 3000rpm is 90mbar approx ( still on the high side). The fact that the sensor is providing a plausible output at 3000rpm is a good sign that it is actually working fine, just that it's out of calibration.
I remember that mine used to sit at about 5-6mbar. Being a linear sensor this doesn't cause too much of a problem though but it does cause a miscalculation of the dpf regen cycle duration and interval. I ran 'replace differential pressure sensor' to tell the ECU that the current atmpospheric pressure value was the zero baseline, with the engine off