Is there a guarantee

Depends on who you buy it from and the warranty you get. Are you buying new or used? New you have a manufacturers warranty, used is usually As Is, but depending on the seller, you will get a short drivetrain warranty. Always have your mechanic inspect the vehicle Before purchase, that way you know what you are getting into.

Buy a CPO car if you want a warranty. Most other warranties are just a few hundred miles and maybe a week.