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Message: <blockquote data-quote="Fred W" data-source="post: 997807" data-attributes="member: 3828">The O2 sensor doesn't throw codes if it's not working at all.  That is how we can disconnect the thing altogether when we install a Power Commander and the ECU is still happy.  Also, when Ross Keen got his O2 wire pinched in between some faring piece and a frame member, grounding that wire cause the engine to run like doody but there was nary a check engine code.  [edit - Ross jumped into the thread while I was typing!)The FJR's emissions ECU is a lot more primitive than the typical OBD2 automotive ECU.  It will put up with a lot of evils and never throw a code.Walt makes a good observation, that the blueing is more pronounced on one side than the other, but I think that both sides are excessive anyway.  I'm pretty sure an exhaust gas analysis will lead a competent tech to conclude the bike is running much too rich.  The raw fuel in the engine exhaust is being burnt in the cats and generating afterburner heat.There are a multitude of sensors that could be FUBARed that would result in  the ECU delivering a rich mixture.</blockquote>