b18civic

is the installation of the secondary o2 sensor necessary for a swap. i'm not sure if i should put in the secondary o2 sensor or leave it out? would it damage my engine or would i lose any power if i leave it out. if so, how would i go about installing it? could i use the sensor from my original engine (94 civic ex). there are four wires: two blacks, green and white, where would i hook it to. correct me if i'm wrong, the sensor would need to be install after the cat, right? thanks.

B18C5-EH2

Hey bro, you could always just find an OBDI version of your ECU and just PLUG it in - no need for a jumper harness or anyextra OBDII crap like that secondary 02 sensor.

HKxBlur

I run my 2nd o2 in the cabin of my car right next to the ECU.. It's purpose is to read the air AFTER the cat, and 'what do you know' it's 100% clean..

Don't worry that the o2 heats up a little bit, it's not enough to melt plastic or start a fire.. If u want to see for yourself, just touch one after u run your car for 10min.. no biggie.. just fyi

b18civic

i like the idea. it sound very easy to do, but do you know the pin location i shouldd connect the four wires to? thanks.

b18civic

thanks for the suggestion, but i'm broke as hell and in a lot of debts and i don't want to go through the trouble of find the ecu and having to sell my converter and my ecu. i want to get my car rolling as soon as possible and i only have five wires from the ecu to make a connection for. i know i could get this done. i just need the info.

TedR719

Get an o2 simulator
http://haiparts.com/catalog/product_...roducts_id/286

pelotudo

Which is the 2nd o2? I have an aftermarket DC Sports header on my car now, and it's for a GSR. It only has 1 o2 spot, and it's way down at the bottom. Is there a way to tell which o2 is the 2nd one? MY ECU is throwing codes left and right here, and I have had people tell me to get the o2's welded to the top part of the header...which I REALLY dont want to do. Does the 2nd o2 have to get "HOT" in order to work correctly, or does it not matter?

JB

b18civic

i believe the primary o2 sensor is the one that is located before the cat. convert and the secondary o2 sensor is the one that is after the cat.

b18civic

i believe the primary o2 sensor is the one that is located before the cat. convert and the secondary o2 sensor is the one that is after the cat. both are located at the bottom (obd2 gsr).

TedR719

primary is the one loacated on your header, the secondary is located on the cat.

I believe what the o2 do is just to make sure your cat is doing it's job. as long as the reading from the secondary is better than the primary then it's good.

HKxBlur

Just to clarify, on the GSR the o2 sensor is not on the header, it's after the collector before the cat.. Basically think of it as if both bungholios are on the cat..

DR. ON POINT

wrap that sensor and alminum oil and let it hang....u wont throw any codes......I do it and so do a lot of other people