wow, shouldn't a 2101 focus fly!! But on a sad note I would be surprised if they do anything. I have developed the tick and basically the dealer told me he hears it but if no codes all they can do is tear it down. If there is nothing they find i'm on the hook for repairs to put it back together. His recommendation was run 5w30 oil and don't worry about it. i'm off warranty so i'll wait and see.