i am in the process of swaping a y8 into my 89 hatch i am using a pwo ecu out of a 88-91 civic sir this ecu requires two oxygen sensors, but i have heard conflicting info about the placement of the second sensor if any of you know the proper placement please let me know
thanks

 

the placement isn't particularly important. The most important thing is that the ecu has 2 sensors to monitor.

In a perfect world, you would have a 4-2-1 header, and the o2 sensors would be plumbed on each of the 2 section of the 4-2-1 header, so you are getting 2 cylinders per o2 sensor.

In reality, a lot of people just run them somewhere on the single exhaust pipe, after all the exhaust gas merges, but before the cat. it should work fine either way.

 

thanks for the info this really helps