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Old 07-12-2013, 10:33 PM   #11
xEzekialx
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Mine is 2011 Focus
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Old 07-12-2013, 10:53 PM   #12
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OK so we know that your ECU is looking for an upstream O2, aka primary heated oxygen sensor (PHO2S). It is also looking for a downstream O2, aka secondary heated oxygen sensor (SHO2S). Now you need to find the ECU wire diagram or pinout for a 2011 Focus. Also are you 100% sure that your exhaust doesn't have two O2 bungs?


What AEM O2 sensor did you buy? AEM Part Number =
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Old 07-12-2013, 10:54 PM   #13
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Aem 30-4100
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Old 07-12-2013, 11:43 PM   #14
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Well that says it all. Sorry the 30-4100 doesn't have a narrow band 0-1v output. So you will have to use this separate from the OEM ECU. You will have to run it as well as your OEM O2 sensors.
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Old 07-12-2013, 11:49 PM   #15
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So im gonna have to get a bung solder on.
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Old 07-13-2013, 10:04 AM   #16
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After all this talk and confusion..... I was wondering why you want a wideband O2 with a stock ECU? Do you have some sort of engine mods that you are worried about? I added mine because I just so happen to have 2 of them lying around from previous builds.

I have made engine mods and I just wanted to see how the stock ECU was responding. however I have no way to alter the tune if it were to be lean or rich. That is until I get my Megasquirt hooked up.
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Old 07-13-2013, 10:30 AM   #17
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Don't have stock anything Actually. Got CAI, Ehaust, Header, SCT Xcal from tom.
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Old 07-13-2013, 11:17 AM   #18
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and i would bet that he is running rich for a safe tune without having a wideband. i would suggest taking it off and taking another car to go to a performance shop to get it welded in. i would suggest a performance shop so that it is better.
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Old 07-13-2013, 11:19 AM   #19
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Actually header isnt installed yet. Been looking in how to do everything before i pit it all in.
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