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Overboosting Error Log & Limp Mode

Discussion in 'A3/S3 Forum (8L Chassis)' started by dan-quattro, Dec 2, 2013.

  1. dan-quattro
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    dan-quattro Member

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    Hi all,

    My 2001 S3 AMK has started to throw a wobbler...feeling some hesitation on boost and it will totally drop off before the turbo has fully kicked in to give absolutely no boost whatsoever and drives like a standard 1.8. This occurs in 3rd gear, can't remember the revs, sorry.

    Had it on vagcom and shows 'Charge Pressure: Maximum Limit Exceeded'.

    Take car back out and boost seems to be there in all gears again, so is very puzzling.

    Something is intermittent it appears as it gives me boost up until 3rd gear and it's there that the problems begin.

    possible N75 fault?

    currently sat on my drive and had boost when I got home, on way to work in the morning I'm betting it will be lost again, frustrating.
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  2. dan-quattro
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    dan-quattro Member

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    Just ran vcds lite and showing:

    Along with the 'Charge Pressure: Maximum Limit Exceeded' it also says:

    P1555-35-10 intermittent
    Readiness 0000 0000
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  3. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    17963/P1555/005461 - Ross-Tech Wiki

    17963/P1555 - Boost Pressure Control: Upper Limit Exceeded
    Possible Symptoms

    Reduced power output
    Limp mode

    Possible Causes

    Boost Pressure too High
    Hoses/Pipes incorrect connected, disconnected, blocked or leaking
    Charger Pressure Control defective
    VNT (variable nozzle turbo): nozzles stuck
    Solenoid Valve for Boost Pressure Control (N75) defective

    Possible Solutions

    Check Hoses/Pipes to/between Components
    Check Solenoid Valve for Boost Pressure Control (N75)
    Check / Clean / Replace Charge Pressure Control
    Check / Clean mechanism for variable nozzles


    Its plausible its the N75... have seen them play up before... ideally you want to be logging boost and N75 duty but VCDS lite won't allow you past block 20... over boost can be due to iffy maps, iffy N75 pipes, sticky actuator/wastegate and of course an iffy N75... logging would help diagnose ut if you know someone with a 1.8t you could try swapping out the N75...

    <tuffty/>
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  4. dan-quattro
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    dan-quattro Member

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    Cheers bud,

    My garage have offered some live data logging so will need to get in touch with them I think, and maybe they could also try eliminating some of the possibilities.

    Was just seeing if any of my symptoms seemed obvious to anybody, strange how it's intermittent
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  5. cammage08
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    cammage08 Member

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    Hi, do you have a forge dv? I had the same error code (yes it could be many things) but mine was caused by the dv not being tightly screwed together.
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  6. dan-quattro
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    dan-quattro Member

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    Not that im aware of, i have noticed when boosting the noise is louder than i remember, similar to the noise on a video posted to youtube showing his dv being knackered, so wondering if its that
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