The engine may misfire and/or buck while driving at freeway speeds with no fault code stored in the powertrain control module (PCM). This can be caused by an intermittent fault with the camshaft synchronizer assembly. This condition can be diagnosed by monitoring knock sensor data as per Ford service bulletin #05-22-12. Replacement of the synchronizer assembly will be required to correct this concern.
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Most reported 2010 Ford Taurus problems
The magnet for the camshaft position sensor may fall out of its mount and damage the synchronizers. This causes long crank times when starting the engine and may cause the Check Engine Light to illuminate. If this happens, both the magnets and the synchronizers need to be replaced.
Car ran hot on a whim. Water leaked out as it was being put in. Water got into the oil as well, which Ford says its because the water pump is inside the engine. Ford determined the water pump locked up. Ford service department is replacing the water pump and recommend flushing coolant system and injectors since it ran hot. The service department started out with a price of $2100 but I was able to negotiate down to $1600.