hello, is it possible to use a secondary o2 sensor in the primary spot?, or are they wired differently (internally), i have tried both sensors and they both plug in to each other fine, the reason i ask is because i need a primary which is 170 bucks and the secondary is only 90. it's in a 97dx with the stock d16y7 with a cheapy header and a high flow cat. that was installed prior to me buying the car thanks.

 

anyone have a wiring diagram of the two sensors? thanks