Manufacturer Part Number:  4D0 837 231 M,   8Z0837231M

Frequency:  315Mhz

3button with Panic button 

This remote will work for the following vehicles below:

2004    A6 Quattro, TT, TT Quattro 

2002    A6 Quattro, TT, TT Quattro, S6 

2003    A6 Quattro, TT, TT Quattro