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Random lack of power, VCDS fault codes: 17705 & 17963

Discussion in 'A3/S3 Forum (8L Chassis)' started by FJ0372, Jun 28, 2013.

  1. FJ0372
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    FJ0372 New Member

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    Hey guys, as mentioned in the title I'm having issues with my 1.8t (2001, AUM, completely standard engine). It'll sometimes run fine (as far as I'm aware anyway, it's had this issue since I got it) but it will sometimes run as if it's just not producing the power it normally does. However, the problem isn't awful (i.e. it's not dead slow, just below what is expected of it).

    Having done numerous VCDS scans over the last couple of weeks I have these two recurring fault codes:

    17963 - Charge Pressure: Maximum Limit Exceeded
    P1555 - 35-10 - - - Intermittent

    17705 - Pressure Drop between Turbo and Throttle Valve (check D.V.!)

    P1297 - 35-10 - - - Intermittent

    One thing to note, is ever since having this car, between gear shifts it makes a rather nice hissing sound, not really like a proper dump valve noise but a hiss nonetheless, I thought this was normal for this type of car (being a turbo) but I've read a lot about how people insist it should be silent on A3s/S3s due to the recirculating valve.

    The reason I really want these codes sorted is I'd like to take my car to one of the reputable tuners on here for a remap, but I want all faults resolved beforehand to get the best out of it.

    Thank you in advance for all helpful replies!
    #1
  2. Nilz
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    Nilz Defo worth the wait :)

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    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
    ***********************************************************************
    17705/P1297/004759 - Pressure Drop between Turbo and Throttle Valve (check D.V.!)
    Possible Symptoms

    Malfunction Indicator Light (MIL) ON
    Power Loss

    Possible Causes

    Leaking Hoses and/or Pipes between Components
    Boost Pressure Control Valve (N249) faulty
    Diverter Valve faulty
    Throttle Body dirty
    Vacuum leak

    Possible Solutions

    Check Hoses and Pipes between Components
    Check / Replace Boost Pressure Control Valve (N249)
    Check / Replace Diverter Valve
    Check / Clean Throttle Body
    Perform Throttle Body Alignment (TBA)
    Check for Vacuum leak(s) including PCV system

    These are the details from the Ross Tech Wiki, sounds like you could have a boost leak on the car somewhere, have a visual look and if you cant see anything, see if you can get a pressure or smoke test done to see if it can identify where the leaks are.

    Where are you based??
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  3. FJ0372
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    FJ0372 New Member

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    Thank you Nilz, very insightful. That's a lot of possible causes though! I'm based around East London/ Essex.
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  4. Nilz
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    Nilz Defo worth the wait :)

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    There are alot of causes there, but to be honest its worth getting it boost tested if you can as it sounds like alot of the resolutions are linked to this.
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