One problem related to crankcase (pcv) has been reported for the 2011 Ford Taurus. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 Ford Taurus based on all problems reported for the 2011 Taurus.
I had a internal water pump failure filling the engine with coolant. This resulted in a engine hydro lock condition (luckily I was able limp a very rough running car in the emergency lane at 15mph to a nearby exit). Happened Friday evening Feb 3rd 2017 on a cold 27 degree evening. I was stranded north of nashville, TN on i65. This is a very very bad design flaw. I am mechanically inclined and most cars have external water pumps -- except this one. Not just the Taurus, but all 3. 5 (and 3. 7) motors have a internal water pump design; driven off the overhead cam chain. When it fails, it fails big, dumping all coolant (several gallons) into the crankcase. End result: is a high potential for engine failure as all components including in my case the eco boost turbos submerged in coolant / antifreeze. Learning now it may be $8-9k for a new motor. Besides this expense is to know this engine will hydro lock with all the coolant in it and cannot be easily driven to a safe location seems very very dangerous to me. If the exit were not less than a 1/2 mile away I would have been stuck. No one wants to be on a dark freeway for 1-2 hours waiting for a tow truck on a cold Friday night. All is takes is one person from behind to slip off into the emergency lane and then it's all over.