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Thread: P1105 & P0105 Barometric Pressure not plausible

  1. #1
    Regular Member Innes's Avatar
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    Default P1105 & P0105 Barometric Pressure not plausible

    Hi guys,

    when I was in a slow moving jam I noticed the spanner thru car icon appear then disappear. Thought nothing of it but would keep an eye open for it. It happend aagain today as I pulled up to a set of lights it came on again but this time stayed on for a half a mile in Limp Home Mode then went out again. Just pluegged in the reader and got:

    P1105 - Barometric Pressure not plausible with Boost Pressure
    (FA) - Not present

    P0105 - Barometric Pressure not plausible with Boost Pressure
    (FA) - Not present

    Is the Barometric Pressure at the top left of the engine bay by the MAF? I've had a look at it and it looks clean and its connected.

    I cleaned the boost sensor about 3 months ago so cant imagine it needs it again already.

    Has anyone got any other suggestions?

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    Admin & Merchandise Manager bigmac's Avatar
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    Vehicle : insignia

    Trim : irmscher

    Engine : 2.0 cdti

    Year : 2009

    Default

    Could be split hoses mate or boost sensor sure ive seen them codes before might be best searching forum as im sure someone posted about Barometric fault codes a while ago

    Irmscher Insignia CDTI 130

    MOD'S...Irmscher front spoiler, Irmscher mats, Irmscher door pins, Irmscher rear spoiler, Irmscher grille, Irmscher skirt & exhausts,Irmscher Roof spoiler MOD'S TO COME..Side skirts,Wheels

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    I'd start with cleaning the map/boost sensor & the inlet elbow too

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    i had this the other week mate i found it was a tiny tiny hole a vacuum joint i replaced all the rubber joints been fine ever since.

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    Regular Member Celes's Avatar
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    Vehicle : Opel Signum

    Trim : Sport

    Engine : 3.0 CDTI

    Year : 12/03

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    Our 2.2DTi sometimes, and very randomly, goes into limp mode giving these codes. No idea what it is. As far as I can tell, vacuum hoses are in perfect shape, as are the boost ones. Boost sensor, EGR, top manifold are all sparkling clean.

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    i thought mine where all ok, i dont have a vacuum tester so my bro pressure tested them and the one to the actuator had small leak could not hear it just pressure went down so replaced them all in one go. i put mine in 3 garages and had a few different responses some said throttle position sensor boost sensor and my local said one pipe will have a hole in i was on hours trying to find and i could not find it so i thought id cable tie the actuator open and bingo solved prob, thats when bro tested pipes.

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    Regular Member Celes's Avatar
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    Vehicle : Opel Signum

    Trim : Sport

    Engine : 3.0 CDTI

    Year : 12/03

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    Did you have a bit less power than usual?

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    Did not seam like it, I had not had the car long and 2.0 dti standard does not have much power to start with. It seamed when car was about 2 .5 thou revs it went into limpode but on odd occasions it would go in early or sometimes I was lucky and it never went into limpmode.

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    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

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    I have seen that fault code when tuning up the boost with the CRD-T tuning box. The ECU is seeing less pressure than is actually present, so it's quite reasonable in this case. If you are getting it without modifying the boost sensor readings, then I would check:

    Boost sensor on the manifold (also a temp sensor)
    MAF sensor

    These you have checked already, so the next step is to look for boost leaks. Split hoses are common, the U tubes onto the intercooler being the No1 offender. Clips not tight could cause leaking. The swirl valves can start to move vertically and leak boost. The intercooler could be ruptured, which would be hard to check without removing the heat exchanger.

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    Regular Member Innes's Avatar
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    Vacuum pipes are in good nick they are the silicone ones. My Inter cooler hoses have also been replaced with silicone ones although the one on the right going into the manifold is home made so will check how firmly its in place. I havent check the U shaped ones connected to the intercooler yet though.

    Cleaned the boost sensor this afternoon just in case.

    Will keep an eye on it for now. its only happend twice. Once very briefly and the other for half a mile. It happens when I'm near stationery o.e rolling up to the lights or slow moving Jam.

    Thanks for all your input. Will keep you posted!

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