i have a 00 hatch with an 00 si wiring harness. i can't find the seconday o2 sensor plug. its like not there, i'm trying to wire up my extra o2 sensor so i can pass emissions but i can't find it. please helpme out asap. where is it suppose to be? i've looked all under the car. thanks

 

is it possible that i have a different harness but have the 00 si ecu? it is throwing 2 codes, primary and secondary o2 sensors.

 

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The secondary o2 has to be wired up because in the 00 si's they are run from the cat to inside the car behind the cup holders to the ecu.

 

if you did the dash harness swap, its under the carpet under the dash in the center covered by a plastic piece. pic shows plastic piece in my o2 sim install thread below. if not, what he^^ said

what are the codes?? they require different things to fix.

 

ah thank you, you guys are life savers. i would have never guessed to look under the dash.