Sec. 3. (a) Except as provided in subsection (b), a person who violates section 1 or 2 of this chapter commits a Level 6 felony if:
(1) the person has a previous conviction of operating while intoxicated that occurred within the seven (7) years immediately preceding the occurrence of the violation of section 1 or 2 of this chapter; or
(2) the person:
(A) is at least twenty-one (21) years of age;
(B) violates section 1(b), 1(c), or 2(b) of this chapter; and
(C) operated a vehicle in which at least one (1) passenger was less than eighteen (18) years of age.
(b) A person who violates section 1 or 2 of this chapter or subsection (a)(2) commits a Level 5 felony if:
(1) the person has a previous conviction of operating while intoxicated causing death or catastrophic injury (IC 9-30-5-5); or
(2) the person has a previous conviction of operating while intoxicated causing serious bodily injury (IC 9-30-5-4).