The check engine light may come on due to failure of the Variable Camshaft Timing (VCT) solenoids. The VCT solenoids will need to be replaced if they are the reason the check engine light came on.Google+
Car Problem Reports
Mercury Milan Check Engine Light Illumination
Mercury Milan Problem
Engines Affected: 2.5L 4 Cylinder, 3.0L V6
Average Mileage: 43,687 mi (15,000 mi - 92,000 mi)
Visitor, 2010 Mercury Milan, 3.0L V6
Variable camshaft solenoid replacement at 39650 miles.
It had been raining .started it and it missed .Than engine light came on .I drive it and it flashes on and off .I can feel it miss .I drove it about 20mile , Thanking it may have water or moisture causing this .Just seems odd to start missing after rain.Will call dealer and see what they say.
Visitor, 2010 Mercury Milan, 3.0L V6, 28,600 mi
AWD premier p0022 VCT timing over retarded