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Old 09-17-2012, 12:21 AM   #36
Big McLargehuge
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Join Date: Feb 2012
Location: Dallas
Posts: 7
My Ride: 2004 325ci
Originally Posted by darksideracer69 View Post
You'd have to have inpa or something like that to check It out. Cause it wouldn't throw a code, but it'd be running rough. Post and pre cat sensors are different plugs so they don't get mismatched. But you can mismatch pre cat 1&2 sensors, you know what I mean?

Sent from my Dell Streak
I have a feeling that all four of them are mismatched. I'm going to slap the Euro 2 tune on soon to eliminate the post cat o2's, but I'm concerned that the post and pre's are in the wrong spots. I cant remember whether the square plugs are in the post cat spots or pre. and vice versa for the round plugs. Which is why I am trying to figure out which plugs go in which location. Are the square plugs pre or post?
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