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I havn't had to swap any out yet on a zu, but for 1996+ (OBDII compliant) isuzu V6's, I would use factory replacements for the two pre catalytic converter oxygen sensors & aftermarkets for the two after cat sensors. Hopefully the G-roo's will chime in :wink:- but it's my understanding that the after cat O2 sensors basically just tell you when a cat is not funtioning, while the pre cat sensors do all the manangement work.
Joel
 
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