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Thread: how to determine parts from fault codes... help needed.

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    Default how to determine parts from fault codes... help needed.

    Hi All,

    Does anyone know how to determine what parts you need from the fault codes generated?

    I have just had a diagnosis done on my vectra c 1.9 cdti 150 sri as it is experiencing the dreaded "power loss" and "limp mode" issue.

    The codes/description that came up were:

    P0002 Fuel Volume Regulator Control Circuit Range/Performance.
    P0100 Mass or Volume Air Flow Circuit Malfunction.
    P0380 Glow Plug/Heater Circuit "A" Malfunction.

    iv been frantically trying to search online for parts for these faults but so far every garage i contact has told me that i need to know the specific part to replace for these faults and i dont know what the specific parts would be.

    Can anyone out there help me????!

    thanks in advance.

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    Regular Member rushy's Avatar
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    Vehicle : SRi


    Engine : Z22SE (2.2 Petrol)

    Year : 2004

    Mileage : 137000

    Default

    Enter the fault codes into google and you get loads of threads from different forums on each one mate.

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    tried searching for solutions, but all that keeps coming up is a list of fault codes and descriptions which i already have.

    been searching for ages now...

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    Regular Member LADmachining's Avatar
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    What you are asking is the secret good auto electricians learn - diagnostic skills!

    A fault code is only the beginning and a pointer to the area the problem is located. From there, you need the factory checking procedures, a multimeter and a diagnostic tester to carry out diagnostics and isolate the problem down to a particular sensor.

    It would be unfair to say "for X fault code, replace sensor Y", as it may not be the fault and could end up costing you a lot of money. Often, several fault codes are interlinked, as in one dodgy sensor causes more seemingly unrelated codes to appear - this may well be the case with the p0002 and p0100 faults you have.

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    oh so thats how it works, i guess i better tell the mechanic to stop before further checks have been done as i just told him to replace the glow plugs, MAF and the fuel volume regulator, although i think the fuel volume regulator is at fault cause my bro was driving on the motorway and the car went straight to reserve light and lost power. It got towed to the petrol station where it was filled up with diesel and it was fine afterwards. The thing was he filled it up with ten pounds the day before and hardly used the car.

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    [Ex]Admin Duncan's Avatar
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    Quote Originally Posted by LADmachining View Post
    What you are asking is the secret good auto electricians learn - diagnostic skills!

    A fault code is only the beginning and a pointer to the area the problem is located. From there, you need the factory checking procedures, a multimeter and a diagnostic tester to carry out diagnostics and isolate the problem down to a particular sensor.

    It would be unfair to say "for X fault code, replace sensor Y", as it may not be the fault and could end up costing you a lot of money. Often, several fault codes are interlinked, as in one dodgy sensor causes more seemingly unrelated codes to appear - this may well be the case with the p0002 and p0100 faults you have.
    Exactly

    Just because X fault code is present, doesn't mean that Y component/sensor needs replaced as it could well be Z component/sensor upstream/downstream (so to speak) that is actually triggering the fault code.

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