I think you mean DFCO, not EOC, don't you? I think my UG goes to zero or sits at the last number or shows "err" when I EOC. Assuming it is DFCO you are asking about ... the gauge is reading the upstream O2 Sensor to detect DFCO, so check for a "lazy" 02 (contaminated or otherwise damaged). Hope that helps...
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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