While Lexus is well-known for its quality-built cars, there are cases of particular models that are prone to have problems that are especially very expensive to fix. As an example, here’s one Lexus model this Toyota mechanic advises against buying. But if you already have one, he provides some good advice on not only how to test your Lexus to see if it has this problem (or is about to develop one), but what you can do to save money toward fixing the problem.