TT (Mk1) Discussion Discussion forum for the Mk1 Audi TT Coupe & Roadster produced from 2000-2006

help identifying sensors

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Old 12-19-2009, 02:23 PM
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Hey guys, I am curious what a few sensors are.

1) the thing on top of the valve cover over the 4th coil. theres no electronics going to it, but theres a vacuum line on it... what does it do? what happens If I removed it?
2) valve cover breather line -> goes to the intake manifold and the intake to a sensor on the actual intake. What is that sensor? I am NOT talking about the MAF sensor or the diverter valve. Is it an air intake sensor? I really want to put a filter over the breather and call it a day.
3) Is our car "drive by wire"?


thank you
Old 12-21-2009, 03:40 PM
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Please? Im not finding anything.
Old 12-25-2009, 12:24 PM
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Cool design but image looks very flat form the render would look cool if the mountains in the background where blurred and at a darker tone



I forgot how to **********. Trying to re hone my skills.
Old 12-25-2009, 04:27 PM
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Originally Posted by haverty
Hey guys, I am curious what a few sensors are.

1) the thing on top of the valve cover over the 4th coil. theres no electronics going to it, but theres a vacuum line on it... what does it do? what happens If I removed it?
2) valve cover breather line -> goes to the intake manifold and the intake to a sensor on the actual intake. What is that sensor? I am NOT talking about the MAF sensor or the diverter valve. Is it an air intake sensor? I really want to put a filter over the breather and call it a day.
3) Is our car "drive by wire"?


thank you
I starting to like this forum. Now if Tiger Woods can say out of trouble maybe I will get some work done.
Old 12-26-2009, 12:33 PM
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The black thing is a vacuum reservoir. Not sure what you mean on the breather line..
Old 01-04-2010, 08:01 AM
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Yes, the TT is drive by wire. Sorry, I cannot answer your other questions.
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