Look at the fuel cap, make sure the rubber is good ans not cracked and has no dirt build up on it, if it does clean it good. While you are there check the filler neck where the cap fits make sure it is smooth and not rusty, if it is, clean it good. the vehicle will randomly run a evap test checking for a vacuum build up in the tank if it does not sense the vacuum it will put on the light and it will stay on until it runs the test and the vehicle passes the test. That it the reason there are signs at the gas station that say shut off your vehicle when fueling. make sure the cap is on properly and on tight before leaving.
SOURCE: FORD ESCAPE EMISSION CONTROL WARNING
There is a problem being logged into your computer for the light to be on. Take a little advise and check your local parts stores for a code reader. Some parts stores will hook to your car with their reader and tell you the problem. If the mechanic did not hook to your car with an OBD II reader, then he is just guessing what is wrong. There are a lot of sensors that cause this light to go on. This will effect the drivability of your car too. So in short, I do not agree with this mechanic if he did not hook your car up to a ODB II reader/scanner.
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