Hard to say what the issue is. But I gotta say that I don't see how bad gas could cause a System Too Rich issue.
The real issue is that diagnosing vague error codes like that one is time-consuming, and Honda doesn't pay very well for diagnosis under warranty. (And make no mistake, this is totally a warrantable problem.)
The real issue is that diagnosing vague error codes like that one is time-consuming, and Honda doesn't pay very well for diagnosis under warranty. (And make no mistake, this is totally a warrantable problem.)