Recently replaced the cat, donut gasket, manifold gasket and resonator to cat gasket. New Honda oem spring bolts aswell. Used permatex ultra copper on both sides of the manifold gasket as both mating surfaces were pitted. I cleaned them up as much as I could but figured thats what ultra copper is for. Also covered the flange on the cat to completely seal it. I've been getting a intermittent downstream o2 sensor code. 0 change in performance. Is this from the ultra copper that squeezed into the exhuast and will just be burnt off eventually and causing the code? Oh yeah both o2 sensors are brand new
S.borutski
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