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Thread: Fault code 1901 and limp mode ?

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    Default Fault code 1901 and limp mode ?

    Stripped down and cleaned egr valve which is now ok but after driving 2 to three miles car goes into limp mode. After turning off ignition and re-starting it does the same again last plug in i had came up with P1901 pressure sensor differential too high, is there a simple fix for this ?

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    Vehicle InfoStats

    Vehicle : CDTI 150

    Trim : Design

    Engine : Z19DTH

    Year : 2005

    Default

    1901 normally relates to the DPF. The sensors are connected either side of the DPF and the difference between pressures informs the ECU of the state of the DPF.
    Excessive soot which can block the EGR can also lead to soot build up in the DPF.
    Simple fix may mean driving the car so the ECU can perform a regen.
    Engine has to be at normal operating temp then run for about 20 mins over 2500rpm

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