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Check engine light with code P0139 on 2006 Acura RSX

Would a secondary O2 sensor see a race header as a faulty cat?
My check engine light is on with a code P0139. I have checked the wiring, replaced the O2 sensor and put a non fouler/ check engine light eliminator in the secondary O2 bung.

Asked by for the 2006 Acura RSX
SHOULDN"T SEE IT LIKE THAT BUT YOUNEVER KNOW ON CARS. ARE YOU ABLE TO READ O2 ACTIVITY?
I can read the secondary O2 sensor voltage and it stays around. 5 volts
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