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Thread: Less boost 2.0 tdi, no fault code

  1. #1
    New User
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    Aug 2017
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    Less boost 2.0 tdi, no fault code

    Hi guys 👋.
    I have a Audi A4 2011 (b8) 2.0 tdi quattro, and have problems with the boost.
    My Audi have another software, and the turbo just to peak about 2.1 bar (215hp /original 170hp).
    I haven’t put the throttle down for some time. But for about 2 weeks ago I notice, that my car only “charging” a peak on 1,7 bar.

    I tried to record logos with the VCDS, but I did something wrong.
    What I notice, was that the car get what it wants in boost.
    What I also notice was that mass air sensor get about the double value of what the car calculated.
    I don’t remember the value, but I think the calculated value was 300...something g/s, but it get over 600 g/s.

    Car run great, but doesn’t have all the power.
    Can a fault mass air sensor make the turbo have less boost, but don’t built a fault code?

    Regards Tony

  2. #2
    Benevolent Dictator Uwe's Avatar
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    Jan 2014
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    Please post an Auto-Scan for context, so people can see exactly what ECU you have. Only then we can people advise what data you should be logging and what it actually means.

    The engineering problems are likely insurmountable. It would be like proposing to land a rocket booster section on a barge floating in the middle of the ocean.

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