I bought my first Ford almost 30 years ago, and since that I have had almost 10 Fords. I started my Expedition era in May, when I bought 2013 EL. The "service engine" light turned on last week and I booked a service time for local Ford dealer, as well the emergency brake was not working at all. Before service date the idling went rough, high idling at cold and low at warm. Well, when the service date came, the first diagnose was really scary. The cost estimate was over $5000, which was about 1/3 of the purchase price. The most expensive was leaking vacuum hose to brake booster (almost $2000), then spark plugs $975, windscreen washer (which wasn't broken but they wanted to fix it) almost $1000 and something else. The fault code reading cost was $150. So I came home, without $150 and basically without any information about fault. Then I ordered a new air flow sensor and new spark plugs from eBay, total cost with shipping was $52. The air flow sensor fixed the problem, and emergency brake needed only adjusting. So far so good, everything works now. But the service diagnose was really scary, over 5 grand estimate and they didn't find actual root causes! Now my cost were only about 1/100 of the estimate and the most important, faults were fixed...