Emissions Code P0171

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So, we picked up our new 50i and I just got this code yesterday. A quick Google search came up with a ton of hits for "Lean on bank one" but every one was on an older vehicle. Most were dirty/bad sensors or loose air inlet connections. Any idea what could cause this on a new car? I was tempted to clear the code and see if it comes back as BMW can't get me in until next Wednesday but I wasn't sure if I should leave it there for them to deal with. Thoughts?

[CarguyF15]

I had an e53 4.4 threw that code. It was a bad MAF. Since you have a new car I would just clear the code and see if it comes back.

[Stinkyxy]

Just take it back to the dealer and have them fix it. Clearing a code may mask a problem.

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I suppose I can see it either way. If it's a real problem, the code will return. If it's not, I save a trip in. The only way for sure for it to come back is to cancel the appointment at the dealer... Thanks for the thoughts guys.