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    leeboss87's Avatar
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    Audi a3 1.9tdi airbox pipe

    Hi all, I've just fitted a s2000 air filter to my tdi, there was a small pipe connected to the back of the airbox so I put a breather filter on it, does anybody know what this pipe is for and if it can be removed, thanks

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    Quote Originally Posted by leeboss87 View Post
    Hi all, I've just fitted a s2000 air filter to my tdi, there was a small pipe connected to the back of the airbox so I put a breather filter on it, does anybody know what this pipe is for and if it can be removed, thanks
    It's fresh air feed to the N19 vacuum valve that controls the egr and the diesel equivalent of the N75 ( controls vane geometry instead of waste gate on petrols).

    Will be fine with a breather filter on it, just don't block it off like I have seen some do by wedging a screw in the pipe or similar!

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    leeboss87's Avatar
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    Ah ok, thanks for the help

 

 

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