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  1. #1
    Veteran Member Four Rings jsantiago17's Avatar
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    Aug 07 2008
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    31705
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    2004 A4 Quattro3.0L UltraSport
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    Westchester, NY

    Error Code P0299 Turbo/Supercharger Underboost

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    Hey guys,

    I'm an old B6 owner, but asking for a friend who has a B8. She just threw the following code: P0299 Turbo/Supercharger Underboost. She took it to the dealership and they are recommending replacing the Turbocharger Recirculation Valve and are quoting her $3,000 to do so. I've already recommended a couple of shops, but what is a fair quote for this job?

    Appreciate any help in advance.

    Jorge


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  2. #2
    Veteran Member Three Rings Stazi's Avatar
    Join Date
    Aug 27 2019
    AZ Member #
    516771
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    2012 Audi A4 S-Line, 2019 Jeep Grand Cherokee Altitude 4x4, 2017 Moomba Craz
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    Michigan

    That’s absolutely ridiculous. $3000 for a recirculating valve? Fuck me....they saw her coming a mile away. You shouldn’t even have to ask that question.

    In any case if it’s an B8 it probably has a leaking wastegate.

    Look up how to fix this in the A4 B8 underboost code topic. I made a post on how to do this in about 15mins with either a large screw driver or a small pry bar.


    Sent from my iPhone using Tapatalk
    2012 Audi A4 2.0T S-Line
    K04 // IE Stage 3 K04 tune // USP HFC // Becker Cat-back // ECS Intake Pipe (w/modded airbox + K&N) // ECS Luft-technik FMIC Intercooler and pipe kit // GFB VTA // RS mesh grille // CF M4 style spoiler // ST rear sway bar.

  3. #3
    Veteran Member Four Rings a4lownslow's Avatar
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    Feb 12 2014
    AZ Member #
    144887
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    2007 Audi A4 2.0T
    Location
    Hudson WI

    They probably quoted $3000 for a turbocharger


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  4. #4
    Veteran Member Four Rings jsantiago17's Avatar
    Join Date
    Aug 07 2008
    AZ Member #
    31705
    My Garage
    2004 A4 Quattro3.0L UltraSport
    Location
    Westchester, NY

    Quote Originally Posted by Stazi View Post
    That’s absolutely ridiculous. $3000 for a recirculating valve? Fuck me....they saw her coming a mile away. You shouldn’t even have to ask that question.

    In any case if it’s an B8 it probably has a leaking wastegate.

    Look up how to fix this in the A4 B8 underboost code topic. I made a post on how to do this in about 15mins with either a large screw driver or a small pry bar.


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    Yeah.... that's exactly what i said! I appreciate your insight and suggestions.

    Sent from my SM-G950U using Audizine mobile app
    |Milltek Exhaust|Unitronic Flashed|JHM Short Shifter|Koni Sports|Eibach Pros|RS4 Rear Sway|Euro RS4 Steering Wheel|RS4 Race Pedals|Miro 111's|S4 Mirrors|
    |B6 S4 Calipers|JHM 2 Piece Lightweight Rotors|Akebono Euro Ceramic Brake Pads|Evoms CAI|Hoen Xenon Match Foglights

    http://www.youtube.com/watch?v=xccmzudcY8o
    http://www.youtube.com/watch?v=BZOJIV1y0EQ

  5. #5
    Veteran Member Four Rings jsantiago17's Avatar
    Join Date
    Aug 07 2008
    AZ Member #
    31705
    My Garage
    2004 A4 Quattro3.0L UltraSport
    Location
    Westchester, NY

    Quote Originally Posted by a4lownslow View Post
    They probably quoted $3000 for a turbocharger


    Sent from my iPhone using Audizine
    Exactly what I'm thinking they did. Did some research after posting this and doesn't seem uncommon the stealership recommends this when this code is thrown.

    Sent from my SM-G950U using Audizine mobile app
    |Milltek Exhaust|Unitronic Flashed|JHM Short Shifter|Koni Sports|Eibach Pros|RS4 Rear Sway|Euro RS4 Steering Wheel|RS4 Race Pedals|Miro 111's|S4 Mirrors|
    |B6 S4 Calipers|JHM 2 Piece Lightweight Rotors|Akebono Euro Ceramic Brake Pads|Evoms CAI|Hoen Xenon Match Foglights

    http://www.youtube.com/watch?v=xccmzudcY8o
    http://www.youtube.com/watch?v=BZOJIV1y0EQ

  6. #6
    Veteran Member Four Rings JLAllroad's Avatar
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    Nov 11 2017
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    409695
    Location
    Denver, Colorado

    How many miles on the car? Audi extended the warranty to 70k for this exact reason. Otherwise I would nudge the wastegate actuator bracket as was suggested, only need to move about 1/8-1/4”.


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  7. #7
    Veteran Member Four Rings jsantiago17's Avatar
    Join Date
    Aug 07 2008
    AZ Member #
    31705
    My Garage
    2004 A4 Quattro3.0L UltraSport
    Location
    Westchester, NY

    Quote Originally Posted by JLAllroad View Post
    How many miles on the car? Audi extended the warranty to 70k for this exact reason. Otherwise I would nudge the wastegate actuator bracket as was suggested, only need to move about 1/8-1/4”.


    Sent from my iPhone using Audizine
    Thanks for the suggestion.... I'll pass it along. The car has 80K miles, so out of warranty

    Sent from my SM-G950U using Audizine mobile app
    |Milltek Exhaust|Unitronic Flashed|JHM Short Shifter|Koni Sports|Eibach Pros|RS4 Rear Sway|Euro RS4 Steering Wheel|RS4 Race Pedals|Miro 111's|S4 Mirrors|
    |B6 S4 Calipers|JHM 2 Piece Lightweight Rotors|Akebono Euro Ceramic Brake Pads|Evoms CAI|Hoen Xenon Match Foglights

    http://www.youtube.com/watch?v=xccmzudcY8o
    http://www.youtube.com/watch?v=BZOJIV1y0EQ

  8. #8
    Active Member One Ring
    Join Date
    Jul 21 2019
    AZ Member #
    503889
    Location
    Christchurch

    You would want to replace it, and you should do it yourself. Look up videos on YouTube. And the price is gonna be the cost of a brand new diverter valve.

  9. #9
    Veteran Member Three Rings Stazi's Avatar
    Join Date
    Aug 27 2019
    AZ Member #
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    My Garage
    2012 Audi A4 S-Line, 2019 Jeep Grand Cherokee Altitude 4x4, 2017 Moomba Craz
    Location
    Michigan

    Quote Originally Posted by xlee11 View Post
    You would want to replace it, and you should do it yourself. Look up videos on YouTube. And the price is gonna be the cost of a brand new diverter valve.
    It’s not the diverter valve......at all.


    Sent from my iPad using Tapatalk
    2012 Audi A4 2.0T S-Line
    K04 // IE Stage 3 K04 tune // USP HFC // Becker Cat-back // ECS Intake Pipe (w/modded airbox + K&N) // ECS Luft-technik FMIC Intercooler and pipe kit // GFB VTA // RS mesh grille // CF M4 style spoiler // ST rear sway bar.

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