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Thread: TFSI - Oil leak - Not a VCDS related question? or is it?

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    Ross-Tech Employee DrPeter's Avatar
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    TFSI - Oil leak - Not a VCDS related question? or is it?

    Hi there,

    I would like to share with you a recent tech inquire that prompted me to write this quick Tech Tip
    about a 2009 Passat with a couple common fault codes and a condition that we are starting to see more and more of.

    Details:
    Vehicle: 2009 Passat
    Engine: CCTA - 2.0L TFSI, Chain drive

    Engine Fault codes:

    P0171 - Fuel Trim; Bank 1: System Too Lean
    P119A - Fuel Pressure Sensor (G247) : Malfunction


    We checked the Measuring Value Blocks Group [032]-Lambda Control (Mixture Adaptation)
    Field 1 (Adaptation (Idle),Bank 1) = [5.6]
    Field 2 (Adaptation (Partial),Bank 1) = [-2.3]

    Had the customer run the Basic Settings Test [107], engine warm (80'C+)
    - System Not Okay

    I then asked if he noticed if there was an oil leak, between the Engine and the Transmission?
    - There was some seepage, not a lot but enough to leave a few drops on the floor.

    At his point, I suggested he caps off the crankcase breather connections at the intake manifold and the turbo inlet pipe,
    eliminating the engine and its newly replaced crank case breather from influencing mixture control (false air).

    And now run one of my favorite Basic Settings tests again, BS-107..

    This time, it indeed passed, as I suspected it would.

    So it looks like this oil leak needs to be fixed and I suspect he will find what I found last year working on a TFSI Passat engine, see pictures below.

    - Now before everyone starts pulling the transmissions out of there vehicles, it is very important to verify an oil/air leak, or better yet smoke test the crank case with 1-2psi and check for seal leaks.


    Looks normal, right???


    Larger version


    This paper like ring was actually stuck on the crankshaft!
    - POS


    Larger version



    For more information about Measuring Value Block [032] and fuel trims:

    http://wiki.ross-tech.com/wiki/index.php/Fuel_Trim_Info

    and

    https://www.youtube.com/watch?v=yM3iarhSP68



    Hope this helps,

    drpeter
    Last edited by Sebastian; 11-24-2015 at 12:56 PM. Reason: Link fixed.

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