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I want to put a k&n air filter on my 1999 audi a3 1.8t sport, but what are the wires for on the air filter box?

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Most likely the intake air temperature sensor.
The on-board computer needs this to monitor the temp of the outside air so as to provide optimum engine performance.
If you insist on installing an exposed air filter, you must retain the IAT sensor and mount it somewhere close to the K&N filter.

Posted on May 09, 2010

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