what does it mean lemon history reported

This is based off of AutoCheck's glossary which is what CarGurus uses. I have also included a link to the glossary at the end. Lemon If after a reasonable amount of attempts the authorized dealer is unable to conform a new vehicle to any of its applicable express warranties, the manufacturer shall either provide its customer with a new vehicle of a like model line, if available, or otherwise comparable vehicle as a replacement, or accept the return of the vehicle from its customer and refund to its customer the purchase price paid for the vehicle less a reasonable allowance for use of the vehicle. Lemon laws vary in the states that have enacted them. Lemon laws may not exist in all states. https://www.autocheck.com/members/culdesac/freelink_glossary.jsp

I realized that the above definition does not explain it well. In short: Lemon titles vary from one state to another but is often a vehicle that is found to have several manufacturing defects which may affect the safety or use of the vehicle.