Safe to drive. Check your gas cap is tight, as that is one of the frequent causes. Don't try clearing it, there is no point. Read the codes, or better yet, get them read, and you will have pointers to what the problem is. The light isn't the problem, it is a flag that there is a problem. Until you rectify the root cause, it will come back on.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue