Well, as always, my plans changed. I ended up calling the dealer and he talked me into bringing it in since it's under warranty and wouldn't cost anything. I topped off my gas tank with only 140 miles on the odometer but got about 42 MPG so the mileage seems to be back up in the normal range. I read somewhere else that as long as the code is present, the bike stays in open loop mode - maybe my resetting the codes returned it to normal fuel programming.
The dealer called a little while ago and said everything was fine. Nothing wrong with the sensors or wiring. He said it only takes a brief moment for this code to be set, even during start up.
As a side note, the tech that wrote up my ticket upon arrival at the dealer gave me a bunch of grief over my resetting the codes myself. Said that wiped out the historical memory. I told him, "That's why I'm telling you it was a P0152." He pretty much acted like I wasn't supposed to know how to do that and he didn't just want to believe me. When he asked why I reset them, I explained that I wanted to see if it was a historical problem or if it was a condition that still existed and the only way to do that is to reset the codes, run the bike, and check the codes again. He grunted something unintelligible and wandered away.
I guess in Harley's dream world, we're all a bunch of rich morons who barely have enough brain power to start and ride our bikes bit have NO idea how to maintain and troubleshoot them. All they want is the blank check, not a rundown on what we've already done to help solve a problem.
