Manufacturer: Huf
Manufacturer Part number: RDE011
Frequency: 433 mhz
OEM part number (s) coverage: 95836166100, 7P0907275, 4F0907275D
TPMS Relearn site http://www.tpmsrelearn.com/
The TPMS sensor that is used in 2002-2007 Audi A4 is the Huf RDE011. The valve stem is made of aluminum and silver in color.
The valve stem can be removed from the sensor body. This allows you to replace the standard valve stem with a black or gunmetal colored valve stem.
Huf RDE011 fits the following Audi models : 2002-2008 A4, 2002-2009 S4
You can purchase the sensor here:
With silver valve stem: http://www.tpms.com/HUF_TPMS_Sensor_RDE011_42753TP6A82_p/hufrde011.htm
With Black valve stem:
With Gunmetal valve stem: