The primary reason bad gas COULD cause a CEL is if it were watered down, or was just bad to where it caused a misfire. Today's computers will catch that, and set a random misfire code. Otherwise, shakran, I believe you to be correct. I haven't heard of it, either, just that is about the only reason I can think of.
And, I know NOTHING about Honda, so I won't comment on a code 999.
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Generally speaking, if you were to get what you really deserve, you might be unpleasantly surprised.
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