Does anyone know if the secondary O2 can be used as a primary O2? I have gotten mixed messages on this. Some people say they work exactly the same and can be switched with no problems. The only difference is the way the ECU looks at them only. Although if thats true why is the primary O2 more expensive than the secondary O2? The ends do look alittle different but they are both 4 wire heated O2's.
If anyone knows the answer to this please let me know. This could be a big help in tuning my ride. Thanks

I don't think they are interchangable. I work at Mitsubishi and would be more than glad to find out for you today when i go to work.

Thanks that would be a big help. If they arent interchangeable I need to know why they arent. Resistance or what? Reason being my front O2 broke and since I put a O2 simulator on my rear O2 I went ahead and put the Rear onto the front . When you put the car onto a MUTT everything seems to be working just fine it cycles like it should. But I am having fuel problems with this Turbo kit and Im wondering if it could be the O2 swap I did. Thanks.