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Thread: Brand new dpf still got high differential pressure

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    Default Brand new dpf still got high differential pressure

    As anyone else had this fault. For a while i have been getting the spanner light on and the dreaded limp mode. When i put the Opcom i get high differential pressure. First i took dpf off pressure washed out, did a regen and was ok for about a week then same fault. I have repeated this process a few times with same result. So i thought sod it and went and bought a new dpf at great cost to bank balance. Low and behold not even a 100 miles and same fault again. I have checked everything EGR, throttle valve for sticking, boost pipes, i have spent hours on here and trying everything that is suggested but to no avail. Has anyone got any suggestions before i go grey or bankrupt.

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    firstly did you tell the car it has had a new dpf ? ....is the pipe work to the dpf sensor ok ? ..what was the actuall code ? ..... 2279 intake air leak detected ? or the dpf presh sensor fault code .? ......is the egr jammed open ? ....swirl flaps ok (if fitted ?)

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    I fitted new dpf selected new particulate filter in opcom which reset saturation to 0% did a forced regen as the people who supplied recommended that this was done. The 2 small rubber pipes that go to dpf are clear. I have cleaned and checked Egr and throttle valve. swirl appears to be all functioning ok. Fault code is p1901 (75) Particulate sensor high differential pressure

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    Quote Originally Posted by littleshanks View Post
    I fitted new dpf selected new particulate filter in opcom which reset saturation to 0% did a forced regen as the people who supplied recommended that this was done. The 2 small rubber pipes that go to dpf are clear. I have cleaned and checked Egr and throttle valve. swirl appears to be all functioning ok. Fault code is p1901 (75) Particulate sensor high differential pressure
    whats the sensor reading in the data list ? ...@ idle and reving it ?

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    At idle it is 8 kpa and at 3000 rpm it fluctuates around 68kpa

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    wow thats blocked then .....or the sensor pipe is blocked 8kpa is the most you might see when @ 3k .....0-2kpa @ idle in normal use ........sensor is ya next port of call ..but i would mitey vac the sensor pipes and see what is actually going on ....

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    My point surely a brand new dpf that i only fitted sturday shouldn't be giving me these readings. How do i get a vac (neg pressure on pipework) that i can gauge

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    your checking the pipes for leaks ....then a good miety vac will read presh so if your miety vac the pipes when running and see if ya get the same presh reading ..if ya do its the dpf / exhaurst system ...if not its the sensor ......if ya get me ....

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    i take it a miety vac is a special tool which i presume as a kpa scale or similar to compare. where do you obtain this and do you vac 1 pipe at a time or both together. this is not a test i have done before. i am a hgv mechanic and usually cure things with a big hammer )

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    http://www.ebay.co.uk/itm/MINIVAC-MI...item3ef8edfed1

    you need one that idealy reads a vacume presh ....and also a over presh ... block the pipes at the dpf end and vac them one at a time and see if they hold presh and dont suck in flat then refit them and run the engine and use the over presh to see what presh is comeing out the pipes ...one will give you your 8 - 60 kpa reading the other should give a very low presh if they both give high presh could be a back box problem blocked damaged and so on ....if they give normal readings its the sensor that might be faulty .... im a vx mec so this is all normal to me lol....


    spose you could use a tyre presh guage and rig something up to read the runing presh ......

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