PO139 Help

AJ28

Senior Member
First Name
Anthony
Joined
Oct 28, 2017
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Location
California
Vehicle(s)
Honda Civic SI 2017
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Hey all,

I recently swapped back to stock FP/DP after running a PRL FP/DP Catted combo. I've had the PO139 CEL when it was installed and I'm still getting it... I had ktuner and flashed back to stock tune etc.

Currently, I have on stock FP/DP with a magnaflow exhaust. Car runs great as well. Would this be upper stream o2 sensor? keep in mind, this is a 2017 honda civic si with 191k miles. lol

Thanks in advance.
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