I called my Lexus dealer yesterday to schedule my 5000 mile service. Since so many people have had the plastic undercarriage fall off, I decided to speak with a service consultant about the potential for this happening. He said that he has never heard of the problem, and if it has happened to anyone, it's because they have lowered their car. Since I HAVEN'T lowered my car, I guess there's absolutely no chance of this happening. Boy! What a relief!!!