It is a defense to prosecution of an offense under Section 601.191 that the motor vehicle operated by the person charged:

1. (1) was in the possession of that person for the sole purpose of maintenance or repair; and
2. (2) was not owned in whole or in part by that person.

Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.