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  • No boost

    Took my S2 out tonight for the first time in about 6 weeks, it last ran perfectly.

    For some strange reason I now have very little boost. My gauge is showing about 0.5 bar. Had vagcom in the car while i was out and read the codes there were 4 i think. So cleared them, drove off and had full boost in second gear, changed to third no boost.

    Checked the codes again when i got home, they are;
    00540 knock sensor
    00513 engine speed sensor

    Have checked the MAF sensor connector/plug and the WGFV connectors all fine.

    Anyone have any ideas?

  • #2
    I think (not sure) knock will reduce boost.
    Had something similar happen after rebuilding my engine which I solved with cleaning the knock sensor connectors behind the engine.
    Might be worth a try.
    Audi S2 -1994 | 480 Hp 650 Nm | FlexFuel | MaxxECU | 3" Stainless | Porsche GT3 Front Brakes
    http://www.garaget.org/?car=52877

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    • #3
      I’ve had a knock sensor failure before it cuts boost, can come back when switched off and back on. They are a bit akward to get to

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      • #4
        Found the problem.

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        • #5
          Wheres the best place to get a
          new one?

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          • #6
            That autodoc seems to do a few

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            • #7
              Thanks Andy will have a look there now.

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              • #8
                Bought both of mine recently from bosch

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                • #9
                  Yeah be careful with autodoc, i know other members have had some issues with orders. Bosch dealers should be able to help you though
                  Greg

                  S2Forum.com Administrator & Webmaster

                  '93 Coupe with a few tweeks

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                  • #10
                    Got a new knock sensor from motorparts direct in the end for £38. Fitted it and problem solved. Back on boost

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