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Thread: P0105 - damn !!!

  1. #1
    Regular Member gtr1000's Avatar
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    Vehicle : Insignia

    Trim : Sri

    Engine : 140 Ecoflex S/S

    Year : 2013

    Default P0105 - damn !!!

    Y30DT but problem common to other models - P0105.

    Just taken the boost sensor out to clean it. Looked OK so didn't bother cleaning it. Refitted it and now getting P0105.

    Can't clear the fault so what the hell's gone wrong?

    Something simple always turns into a nightmare for me on this car .

  2. #2
    Regular Member Critch's Avatar
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    Vehicle : Mk1 renault scenic... I know I know but it drives

    Trim : Basic

    Engine : 1.6 16v

    Year : 2003

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    Is it in properly? And connected properly aswel?

    Non of the vac pipes are loose are they? Double check all the jubilee clips

  3. #3
    Regular Member gtr1000's Avatar
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    Vehicle : Insignia

    Trim : Sri

    Engine : 140 Ecoflex S/S

    Year : 2013

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    Just had everything off again Critch and all is as it should be.

    This is a real pain as I need the car later .

  4. #4
    Regular Member Critch's Avatar
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    Vehicle : Mk1 renault scenic... I know I know but it drives

    Trim : Basic

    Engine : 1.6 16v

    Year : 2003

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    If its all connected properly. Disconnect batt for 20 mins should reset everything

  5. #5
    Full Member bobssignum's Avatar
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    Vehicle : Signum 2.0 DTi

    Trim : Elegance/Elite

    Engine : 2.0DTi

    Year : 2003

    Mileage : 73350

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    P0105 is the barometric pressure sensor . or manifold pressure sensor malfunction . not to sure on where this sensor is on a 3.0 but on 2.0 dti its fitted behind the maf .
    earlier this year i had a problem with this and all the problem was the elec connection,s needed a squirt of wd40 and a clean with some emery cloth and all was fine after
    Driving vauxhall,s for 30 + years
    and still loving it

  6. #6
    Regular Member gtr1000's Avatar
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    Vehicle : Insignia

    Trim : Sri

    Engine : 140 Ecoflex S/S

    Year : 2013

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    Quote Originally Posted by Critch View Post
    If its all connected properly. Disconnect batt for 20 mins should reset everything
    Doing it as we speak .

  7. #7
    Regular Member gtr1000's Avatar
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    Vehicle : Insignia

    Trim : Sri

    Engine : 140 Ecoflex S/S

    Year : 2013

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    Quote Originally Posted by bobssignum View Post
    P0105 is the barometric pressure sensor . or manifold pressure sensor malfunction . not to sure on where this sensor is on a 3.0 but on 2.0 dti its fitted behind the maf .
    earlier this year i had a problem with this and all the problem was the elec connection,s needed a squirt of wd40 and a clean with some emery cloth and all was fine after
    Thanks Bob, will give the connectors a clean whilst the battery's off.

  8. #8
    Regular Member TonyP2020's Avatar
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    Vehicle : Mokka

    Trim : SE - Orange Rock 's !!

    Engine : 1.7CDTi

    Year : 2014

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    If you have a laptop and interface, checking the voltage across the Barometric sensor will show if it has failed.
    0v or 5V (not sure which) is connector loose,
    1.6v = Sensor Fail, 4.0V = sensor pass,
    Barometric pressure will probably be around 100Kpa in either case if connected.
    I do wonder if pulling of the connections for the boost sensor affects/blows the Barometric Sensor.

  9. #9
    Regular Member gtr1000's Avatar
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    Vehicle : Insignia

    Trim : Sri

    Engine : 140 Ecoflex S/S

    Year : 2013

    Default

    Quote Originally Posted by TonyP2020 View Post
    If you have a laptop and interface, checking the voltage across the Barometric sensor will show if it has failed.
    0v or 5V (not sure which) is connector loose,
    1.6v = Sensor Fail, 4.0V = sensor pass,

    I do wonder if pulling of the connections for the boost sensor affects/blows the Barometric Sensor.
    Is this the same as using laptop and diagnostics software?

    Many others seem to have disconnected their boost solenoid with little or no problems but I was also thinking something could have blown.
    Last edited by gtr1000; 2nd January 2012 at 17:10.

  10. #10
    Regular Member gtr1000's Avatar
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    Vehicle : Insignia

    Trim : Sri

    Engine : 140 Ecoflex S/S

    Year : 2013

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    Critch & Bob - disconnected battery for an hour and sprayed connectors with WD40. Still got the problem.

    Update - a summary of what happens......

    Turn ignition on, clear code, start engine, ticks over normal at 700rpm for 2 seconds then hits 1000rpm. EML and spanner light on at this point.

    Turn iginition off, turn ignition on (don't start engine), clear code, turn ignition off. Turn ignition back on and immediately fault code P0105-03 is back again.

    If I disconnect the connector to the boost solenoid, I get the same results as above.

    Man I'm confused and worried. Why did I ever bopther to check this sensor in the first place - should have left well alone as the car was running fine. Mega .

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