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Message: <blockquote data-quote="pipwax" data-source="post: 20215" data-attributes="member: 5234">[USER=6616]@bmarshall3[/USER] I have been having the same issue. from my research what I have found out is that Equinox vehicles are California and federal approved. This requires an OEM Catalytic converter. I am currently on my second after market converter as well and the light comes on occasionally. A theory that someone mentioned to me is to change the downstream O2 sensor to aftermarket as well because the tolerance may be better in line. I will let you guys know if this works, I don't really want to spend more money on another catalytic convertor.   I was told that <a href="https://www.magnaflow.com/collections/direct-fit-catalytic-converters" target="_blank">MagnaFlow</a> was the best.</blockquote>