Make it smell good
Remember, a real person will evaluate your vehicle and you want them to be as comfortable as possible. Studies have shown that smell is a major factor when it comes to opinion and you want the Used Car Manager to have a great opinion of your vehicle. So investing a few bucks in a simple air freshener, may increase your trade-in value by hundreds.
Fix It
You don't actually need to fix it, but at least know what the fix is, how much it will cost, and bring documentation that itemizing its cost. The check engine light can mean anything from a simple fuse replacement to a head gasket needing replaced, so remember that the dealership may think of the worst possible case. The cost to fix the issue will then be charged against the value of the vehicle. Don't let the dealership guess - it rarely works out in your favor.
Be a Salesman
Walk out with your Super Ford TV member and show them why your vehicle is worth more. Talk about the new tires and brakes. Show them your service history and show them the features you love and think the next person will love too.
Come prepared
Know the current market value of your vehicle by visiting online websites like KBB, NADA and third party sales like Autotrader and KSL. This will help you feel more comfortable with information presented after the appraisal as you will have the ability to discuss value with some education.