You didn't get taken too bad, considering it was the dealer. Sounds like two hours of labor at ~$65 an hour. Parts are always overpriced from a Ford dealer, unless you're in good with someone there
In the future, you might want to consider taking the car to AutoZone, or any other local automotive retailer that will pull codes for free. Once you have the code, you can take it pretty much anywhere to have it looked at, or do the work yourself if its easy (like forgetting to tighten the gas cap). Call around to see who will pull codes for free, but even a small charge is better than what a dealer would charge.
Or you can come to the Milwaukee area and I'll pull the code for you
