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Old 07-12-2013, 05:04 PM   #1
xEzekialx
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A/F Hook up

Okay I searched the forums and couldn't find what i was looking for. Im trying to figure out how to hook up an a/f aem wideband gauge.

I have the Cat back exhaust from Fswerks and bought the OBX Header. Would I still plug the gauge into the rear o2 or do i need to get a spot welded on for it?


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Old 07-12-2013, 05:39 PM   #2
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BOOM

http://www.focusfanatics.com/forum/s...11#post4307111

I wrote this up myself. If you have any questions let me know! I did have to have a custom bung welded in the collector pipe of the header, but it depends on the number of 02 sensor ports the header has. If it has 1, you will need a 2nd. If it has 2, you're set!
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Old 07-12-2013, 06:28 PM   #3
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It has two, Will this work on a mk2 focus? Couldnt i use the rubber hole where all my wires come in to the cab to run it out?
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Old 07-12-2013, 06:31 PM   #4
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Is this for a permanent install or just for tuning purposes?

If it is a permanent install the AEM controllers have a stock narrow band output don't they? Shouldn't need to weld in another bung. You should be able to replace the OEM upstream narrow band O2 with the AEM Wideband without any issues. And making use of the stock wire grommets going through the firewall is what I recommend when accessible.
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Old 07-12-2013, 06:36 PM   #5
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Its for permanent installation. how would i go about doing that?
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Old 07-12-2013, 07:00 PM   #6
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You should be able to replace the OEM upstream narrow band O2 with the AEM Wideband without any issues. And making use of the stock wire grommets going through the firewall is what I recommend when accessible.
yeah, stock holes through the firewall are always better, I just didn't want to tear apart my pedal assembly to be able to access one.

If you have 2 o2 ports, you don't need to get another one welded on. My header only had one, which is utilized by the ECU to determine A/F ratio, so I couldn't just swap it for the downstream sensor. Just make sure you have the downstream sensor when you remove it, because if you remove the upstream sensor, there's a pretty good chance your car will run either rich or lean.
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Old 07-12-2013, 07:12 PM   #7
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My stock hole in the fire wall is just to the upper left side wide open. So as long as i have to bungs Im all good to go.
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Old 07-12-2013, 07:27 PM   #8
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Sorry for the Double post. looks like after all the research there is only one bung. Any ideas where to get one welded? pictures?
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Old 07-12-2013, 08:01 PM   #9
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In the collector pipe, right before the flex pipe is the best place. The 1st pic in the thread I linked you to above shows where mine is :)
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Old 07-12-2013, 08:09 PM   #10
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yeah, stock holes through the firewall are always better, I just didn't want to tear apart my pedal assembly to be able to access one.

If you have 2 o2 ports, you don't need to get another one welded on. My header only had one, which is utilized by the ECU to determine A/F ratio, so I couldn't just swap it for the downstream sensor. Just make sure you have the downstream sensor when you remove it, because if you remove the upstream sensor, there's a pretty good chance your car will run either rich or lean.
I am new to the Focus wiring, however I have been running widbeand O2 sensors in place of stock O2 sensors for quite a few years now. You need to find the stock O2 sensor signal input to the ECU. Cut that wire and solder in the narrow band signal from the AEM controller/HO2S. I'm sure there must be an ECU pinout around here somewhere.

The AEM narrow band wire can be/is programmed to work exactly like the stock O2 sensor. Using identical 0-1v output. So if you are running in closed loop on the stock ECU with the AEM UGEO narrow band signal. It will not run lean or Rich. It will run just like an OEM O2 sensor.

As far as what wire goes where, you'll have to give me a bit to find the wire diagrams. I have my Zetec powered Tribute wired up with my Innovate wideband O2 and it is operating with the stock Ford EECV ECU.... AFR's are fine.

I also have the OBX header, mine is the ram horn style and it came with two O2 bungs, What style OBX header did you buy, what year is your vehicle. Most 96+ vehicles are OBDII and have 2 O2 sensors.

OBX header with Innovate O2 installed. Can't see it but it is located jsut under the 4-1 merge collector on the right.


Downstream O2 sensor with spacer for No Cat = No CEL
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