Lean combustion codes 171 & 174 - Mustang Evolution

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Old 02-04-2016, 02:18 AM   #1
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Lean combustion codes 171 & 174

I got these codes two days after removing my cats. Cause or coincidence?
Exhaust leak or because I removed the cats or something else?


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Old 02-04-2016, 05:46 AM   #2
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Which o2 sensors do you have on still?

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Old 02-04-2016, 11:14 AM   #3
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I think I still have rear and front.
Here is a video showing both in case I am looking at something other than what I think it is.
http://youtu.be/s92x-9HW7zY
Note that I have an adaptor extension installed on my rear sensors that claimed to get rid of the codes but they didn't make a difference. Here is a link from where I bought them from
http://www.ebay.com/ulk/itm/151892162037


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Old 03-24-2016, 12:26 AM   #4
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Any other thoughts?
I went and got an engine analysis at Firestone and they told me that I have a minor leak in my gasket manifold. Could that be the cause?


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