2006 Acura RSX Q&A

2006 Acura RSX Question: Check engine light with code P0139

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. -
Answer 1
SHOULDN"T SEE IT LIKE THAT BUT YOUNEVER KNOW ON CARS. ARE YOU ABLE TO READ O2 ACTIVITY? -
Comment 1
I can read the secondary O2 sensor voltage and it stays around. 5 volts -