I bought my Mustang O2 sensor from Advance Auto for like $40

http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_Oxygen-Sensor-Bosch_3486230-P_291_R%7CGRPEMISAMS_909552541___

3-wire. Two white, one black.

You should use the wiring on the existing Mercedes O2 sensor harness to do this as the black wire is the signal line and it connects to a coaxial green wire.

So just match the colors up. It doesn't matter which white wire you solder to a white wire too. They are just heater lines.

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