2006 Chevy Equinox Fuel, emissions and starter check engin

Without knowing the codes, I would doubt that you have all injectors at fault, or all o2 sensors at fault. It could be possibilities of both banks lean/rich, and this won't necessarily present a noticeable performance issue, it could be related to catalyst efficiency(no performance issue). The problem is, the codes just don't necissarily point to a hard failure, it could be part of that cause and effect thing. I would continue to drive until the light reoccurs. Coincidentally, if the conditions that caused the code, corrected itself, it still should have had some kind of history stored. In most cases, faults have to be not present for at least 40 ignition cycles or more, to be purged from the history. Unless of course, a clear codes command had been issued with a scan tool, or code reader.