Get it fixed?
Anyway, if it's an actual problem, it can heat your engine up and cause some damage, if it's severe enough.
i had been trying to get it fixed by myself but was not successful:
1) i had replaced the just-cleaned-and-oiled green filter with the original OEM one
2) i had tried resetting the ECU using the two popular procedures but neither worked
3) i had tried taking off the MAF sensor to clean it but did not have a tool that would fit its screws well enough in such small space.
took it to the dealer. i suggested they clean the MAF sensor, but the annoying service advisor did not want to ("we have tried a hundred times on other cars and it didn't work"). the car waited in que for its turn two days, and then i took it back, without getting looked at, to drive to the track.
i drove at the track with the code until lunch. the car ran at the track perfectly, but idle would swing up and down afterwards. my humble expectation is that if the lean problem was dangerously serious there would have been other symptoms.
during the 2 hour lunch break, with advice and help of other people at the track, i took the entire intake (until throttle) out. there was a film of oil everywhere. cleaned it all, including the throttle body, and the MAF sensor still in its place in the box, with the special purpose "MAF cleaner" spray. put it back, had the code cleared by someone's tool and it hasn't come back since (the remainder of the track day and couple of days of street driving). i still have the swingy idle, but less often.