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  1. #1
    Active Member One Ring
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    Knock sensor part numbers

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    Hi, could someone please tell me the part number of knock sensor 2 and 4 on my B6 S4? Or on which side of the motor are they located? I know that they are under the IM but dont know which one is which.


    Thnaks for your help.

  2. #2
    Senior Member Two Rings PigDiesel54's Avatar
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    Jan 18 2013
    AZ Member #
    107784
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    CT

    FRONT RIGHT = 079905377G
    FRONT LEFT & RIGHT REAR = 079905377E
    LEFT REAR = 079905377H

    Per ECStuning
    2006 Brilliant Red B7 S4 Avant 6MT
    2001 Cactus Green B5 S4 Avant 6MT
    2006 Brilliant Red B7 A4 2.0T Quattro Tiptronic

  3. #3
    Active Member One Ring
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    Yeah, but I need to know which one is, according to VAG, knocks sensor 2 (code 16716) and knock sensor 4 (code 17731)

  4. #4
    Senior Member Two Rings PigDiesel54's Avatar
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    Jan 18 2013
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    107784
    Location
    CT

    [IMG][/IMG]
    2006 Brilliant Red B7 S4 Avant 6MT
    2001 Cactus Green B5 S4 Avant 6MT
    2006 Brilliant Red B7 A4 2.0T Quattro Tiptronic

  5. #5
    Veteran Member Four Rings q_dubz's Avatar
    Join Date
    Dec 16 2008
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    36417
    My Garage
    Single Turbo V8 S4
    Location
    EAST COAST
    Items for Sale

    Before you just go replacing the sensor. Check the wiring connections.

  6. #6
    Active Member One Ring
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    Wiring was checked. But I will look again. Thank you so much for the picture.

  7. #7
    Veteran Member Four Rings q_dubz's Avatar
    Join Date
    Dec 16 2008
    AZ Member #
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    My Garage
    Single Turbo V8 S4
    Location
    EAST COAST
    Items for Sale

    BTW, what were the codes being thrown?

  8. #8
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    Maybe retorque could help but probably not. I will be doing the oil check valves so i wanted to fix this too.

  9. #9
    Veteran Member Four Rings q_dubz's Avatar
    Join Date
    Dec 16 2008
    AZ Member #
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    My Garage
    Single Turbo V8 S4
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    EAST COAST
    Items for Sale

    have you ever removed them?

    Torque should be at 20Nm / 14.75ft-lbs

  10. #10
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    Yes they were removed during the engine rebuild. During the rebuild the ECU was flashed with OEM firmware because there was wrong firmware(maybe a tune) and the car was sputtering. After the flash the codes were thrown. But the sensors could be bad for a long time because the car was down on power when I bought it.

  11. #11
    Veteran Member Four Rings q_dubz's Avatar
    Join Date
    Dec 16 2008
    AZ Member #
    36417
    My Garage
    Single Turbo V8 S4
    Location
    EAST COAST
    Items for Sale

    Quote Originally Posted by Padouch View Post
    Yes they were removed during the engine rebuild. During the rebuild the ECU was flashed with OEM firmware because there was wrong firmware(maybe a tune) and the car was sputtering. After the flash the codes were thrown. But the sensors could be bad for a long time because the car was down on power when I bought it.
    nah, they are merely a vibrating crystal (in simple terms) they don't fail from not being powered. That code tells me they weren't torqued properly.

    They're EXTREMELY sensitive to torque. Mine were over torqued (bad torque wrench or i did 20lb/ft instead of Nm) and I was seeing knock correction at idle LOL

  12. #12
    Active Member One Ring
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    I meant that they could be coded out for the sale and bad long before. The car was kind of pile of shit on closer inspection :) but the price was right



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