OBD2 post cat o2 sensor Install help
OBD2 post cat o2 sensor Install help
Honda-Tech Member
Joined: Jan 2013
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From: The South - Roll Tide !!!
Re: OBD2 post cat o2 sensor Install help
How are you using an OBD-2 P72 ECU in your EG Civic ??? It doesn't plug in directly... soooo. 
There is no provision for a secondary O2 sensor in a '92-95 Civic, so you would have to CREATE a secondary O2 sensor plug and wiring. You would have to run a wire to the ECU for O2 signal and a second wire for the O2 heater circuit... and then get a 12v+ wire and a control ground wire to the plug for it to work.
There is no provision for a secondary O2 sensor in a '92-95 Civic, so you would have to CREATE a secondary O2 sensor plug and wiring. You would have to run a wire to the ECU for O2 signal and a second wire for the O2 heater circuit... and then get a 12v+ wire and a control ground wire to the plug for it to work.
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Honda-Tech Member
Joined: Oct 2020
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Re: OBD2 post cat o2 sensor Install help
How are you using an OBD-2 P72 ECU in your EG Civic ??? It doesn't plug in directly... soooo.
I've got a conversion harness so the ecu can plug into the factory connectors
There is no provision for a secondary O2 sensor in a '92-95 Civic, so you would have to CREATE a secondary O2 sensor plug and wiring. You would have to run a wire to the ECU for O2 signal and a second wire for the O2 heater circuit... and then get a 12v+ wire and a control ground wire to the plug for it to work.
I've got a conversion harness so the ecu can plug into the factory connectors
There is no provision for a secondary O2 sensor in a '92-95 Civic, so you would have to CREATE a secondary O2 sensor plug and wiring. You would have to run a wire to the ECU for O2 signal and a second wire for the O2 heater circuit... and then get a 12v+ wire and a control ground wire to the plug for it to work.
Honda-Tech Member
Joined: Jan 2013
Posts: 10,047
Likes: 1,240
From: The South - Roll Tide !!!
Re: OBD2 post cat o2 sensor Install help
OBD-1 applications only have one O2 sensor... it is installed somewhere in the exhaust system between the header flange and the cat... meaning it is a "Pre-Cat" sensor. OBD-2 applications have TWO O2 sensors... one before the cat and one mounted after the cat. You are asking about the one mounted after the cat... or "Post Cat". So, no they are not the same.
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hotboi850
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Aug 18, 2003 08:46 PM