RSXDM40

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Question Asked: Check engine light with code P0139
May 20, 2012, 08:09 PM
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.
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