installing a dc header onto a b16a1 where as the dc header only has one bung for an oxygen sensor. i read that i should install the primary oxygen sensor. which plug is the primary oxygen sensor? there is a green and a yellow plug. any help is appreciated.

 

 

You can try using a 4 wire o2 sensor but you may still get hesitation and error codes.
The most reliable method is to weld in two o2 bungs in the primaries where the factory header has them, so you can bolt both sensors back in.

 

my friend and i just did this literally 4 days ago, you have to cut your carness open and move it to the back where the new sensor is....is it a 4 into 1 or 4-2-1? his was 4-1 and we just split the wiring harness and it reached fine..you only need one sensorand dont toucht he tip!!! do not touch the part tat goes into the manifold, you will ruin it and its very exspensive!!!!!