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O2 pre/post cat interchangeable

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08-01-2017, 08:19 PM	#1
Most_Wanted ISSIMI Join Date: Apr 2017 Location: Bay Area CA Posts: 144	O2 pre/post cat interchangeable Is there a difference in operation for the pre/post O2's? I know one measures A/F for the ECU and two monitors for cat efficiency. My question is are they interchangeable? I installed headers and the the primary O2 was barely long enough causing a tug on the wires. I noticed the wiring for the secondary O2's being slightly longer & would have swapped them but didn't want to chance it.

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