P0340 means Camshaft Position Sensor
Your cam position sensor or the wiring leading to it has gone bad. It will cause occasional rough running and hard starting until it is replaced. If you live in a county that does emissions testing, your car WILL FAIL unless it is fixed.
The Mercury Sable and the Ford Taurus will have DOC in printed on the engine if they are dual overhead cam engines. The symbol should be on the top of the engine.
Could be sucking air into intake.
No 2011 Mercury Sable model , but there is a 2011 Ford Taurus
You run the engine till warm then look underneath and see if the pump is leaking. A faulty pump leak is very visible in Taurus/Sable.
99% sure the Taurus radiator will be a perfect match to the Sable's.
No they do not
No, a Generation 2 (1992-1995) Taurus/Sable Windshield will NOT fit a Generation 3 (1996-1999) Ford Taurus/Sable.
My 2002 manual says: 11.6 quarts for the Vulcan engine and 10.6 for the Duratec.
On a 2002 Mercury Sable the radiator is at the front of the engine compartment
Yes.
Yes, it does.
Yes, it is identical.