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  1. #1
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    9-5 vector sport 2006
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    P1901 Exhaust pressure sensor front hose blocked or loose

    Saab 9-5 sport Vector 2006 1.9tid.

    Hi,
    I have this faultcode that just wont go away. P1901-F. It says; Exhaust pressure sensor front hose blocked or loose. But what exactly is "front hose"? I am guessing it is the ONE hose that goes from the dpf to the dpf presseure sensor in the enginebay that sits on the firewall. But is this correct?

    I had a minor leakage from turbo-exhaust coupling but that was due to a damaged gasket. Got that fixed today and thought that was the "loose" hose that made the pressure sensor spit out a fault code, but apparently not. Please help. Both dpf and sensor was changed about 5 months ago

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  2. #2
    Dave T.
    Super Moderator Dave T's Avatar
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    1999 9-3SE (2013-2015), 2005 9-3 (2005-2013), 1990 900 (1990-2003)
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    ?

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  3. #3
    Saab Fan
    Join Date
    08 Nov 2019
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    9-5 vector sport 2006
    Thumbs Up:   2
    The question is: what is the 'front hose' in the referenced fault code.

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  4. #4
    Saab Enthusiast
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    13 Jun 2019
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    Colorado
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    Saab(s)
    1999 9-5 wagon
    Thumbs Up:   3
    Found this on another site... Something about 5 subcategories relating to that "p1901" code...

    "p1901......

    02 dpf pressure sensor short to ground
    05 dpf pressure sensor open/short circuit to B+
    58 dpf blocked or front hose loose
    75 dpf blocked
    0F dpf plausibility for with manifold absolute pressure (map sensor)"

    Perhaps the "F" in what you had posted relates to that map sensor.

    I dont know for sure but maybe that helps you?

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