Spoke to Lincoln Concierge at 1-800-521-4140, as well again to my dealer about diagnostic fee under the CPO 6 yrs. 100,0000 warranty, and this was their answer in a nutshell. Repairs have a $100.00 deductible, and if they spend time trouble shooting a problem they confirm, and is covered by the warranty, your only out of pocket is $100.00. However, if they cant confirm your complaint/problem, your are responsible for a diagnostic fee for time spent troubleshooting your car. Labor rate is $140.00 an hour so do the math. And believe me it took some time to establish that much cause no one initially had a clear answer. To their credit, Lincoln said they would reach out to the dealer about my Lincoln Ride Control issues, let's see what happens.