On a 2004 Audi A4, the speed sensor, often referred to as the vehicle speed sensor (VSS), is typically located on the transmission. It is mounted on the side of the transmission case, near the output shaft. Accessing it may require removing some components for better visibility, depending on the specific engine and transmission type. Always consult the vehicle’s service manual for precise details.
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The 2004 Audi S4 has a 6-speed manual.
The 2004 Audi A4 has a 5-speed manual.
380 MPH
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The 2004 Audi TT has a 6-speed shiftable automatic.
The 2004 Audi A6 has a continuously variable-speed automatic.
The 2004 Audi A8 has a 6-speed shiftable automatic.
See this link http://www.a4mods.com/index.php?page=webcontent/pages/ECTsensor.html
Inside the airbox.
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