Many states have laws outlining remedies for consumers that have purchased defective vehicles. These laws are often referred to as "lemon laws". Texas's version of the "lemon law" starts at Section 2301.601 of the Texas Occupations Code, which governs warranties for vehicle owners.
The Texas Department of Transportation provides information on their website about the Texas lemon law that explains what types of vehicles are covered under the Texas lemon law:
New vehicles, including cars, trucks, vans, motorcycles, all-terrain vehicles, motor homes, towable recreational vehicles (TRVs), and neighborhood electric vehicles that develop a defect(s) covered by a manufacturer’s written warranty. Demonstrator vehicles that have not been previously titled are considered new vehicles.
The law does not cover repossessed vehicles, non-travel trailers, boats, or farm equipment. Nor does it cover defects that do not substantially impair the use or market value of the vehicle such as minor rattles, radio static, etc.
Certain used vehicles may be eligible for remedies under the Texas lemon law, according to the TXDOT brochure:
Your used vehicle may be covered under current state laws. Texas law related to warranty performance may cover your used vehicle if it is still covered by the manufacturer’s original warranty (not an extended service contract), or if the defect started and was reported to the dealer while under the manufacturer’s original warranty and the defect continues to exist, repair assistance for that problem may be available to you.