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I replaced the second sensor right before the midpipe, i tried with and without a fouler and still the same code

Hey everyone im new to this forum. I have a 2007 mazdaspeed3 and have the the code p0137 i replaced the o2 sensor and erased the check engine light. 20 miles later I got the check engine light on with the same code reading. Please Help emission testing is coming up lol. My mods are: midpipe...