I need to replace all O2 sensors before trading my Boxster...What is the difference and what would be the correct number of wires for replacement with a universal sensor. They have 1,2,3,4 wire universals but I don't know what the difference is compared to OEM.

 

4 wire sensor. 2 white, 1 gray, 1 black. You will need 4 of them.

 

Thanks very much....appreciate the quick response and info...Have a good one!