2.1's have 3 wire O2 Sensors, not 4 wire.

Try these two links (the number after the "=" is the Bosch Number):

http://www.busdepot.com/details.jsp?partnumber=13913
OR
http://www.busdepot.com/details.jsp?partnumber=15725

Both are Genuine Bosch O2 sensors.  The second link is the Bosch Universal.
BD's price is usually the best you'll find on these.

The ORIGINAL O2 Sensor from Bosch is 13957 (VW 034 906 265 F) and is big $$$
- around $150, give or take a few $.
--
Jim Thompson
84 Westfalia 2.1 "Ole Putt"
73 K Ghia Coupe "Denise"
72 411 Station Wagon "Pug"
oldvolkshome@gmail.com
http://www.oldvolkshome.com
**********************************
On 11/29/06, Joe Beckham <jrbeckh@cox.net> wrote:
>
> Hello all,
>
>
>
> I'm looking for the part number for the Bosch 4 wire sensor for a 2.1L
> Thanks in advance, Joe