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Where to plug in the cat o2 sensor??

 
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Old 05-23-2014, 04:08 PM
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Where to plug in the cat o2 sensor??

Okay this may sound really dumb, but I just finished an h23 blue top swap in my 2001 base, and when I went to go bolt up my exhaust again, I cant find the plug for the downstream o2 sensor!! All I could find is a female plug of the same type, so thats not it. Correct me if im wrong, but the primary o2 sensor plugs in near that supporting bracket for the intake manifold, right? If someone could help me out and tell me where the second one plugs in that would be awesome! Thanks
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Old 05-24-2014, 02:39 AM
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Re: Where to plug in the cat o2 sensor??

you can cut the plugs off away and connect just the wires if theres no other way
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Old 05-24-2014, 03:09 AM
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Re: Where to plug in the cat o2 sensor??

But I remember unplugging it...I just cant find the plug now
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Old 05-24-2014, 04:30 PM
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Re: Where to plug in the cat o2 sensor??

I am assuming that you are using the engine harness and ECU that came with the H23A motor. Because the H23A VTEC is OBDI, there is not a downstream O2 sensor like all OBDII motors have. Just remove the downstream sensor from the catalytic converter, and put in a pipe plug.
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Old 05-24-2014, 06:21 PM
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Re: Where to plug in the cat o2 sensor??

Nope, im using the h22a4 harness and ecu. Thats the scary part lol
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