That code is for 02 heater circuit. Replacing the sensor may not fix it. I'd have to check voltage and ground for the heater circuit wiring. The voltage is fuse protected, red wire.
Just to add, my info said bank 1 sensor 2.
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SOURCE: Occasionally my 2003 Taurus stalls
check all of the vaccum lines and check for leak at the fuel injection unit and for leaks at the intake manifold also make sure the spark plugs are at the right gap and change the fuel filter and here is a couple of website to checout www.autozone.com and www.alldatadiy.com and i forgot one www.taurusclub.com and i hope i have been some help to you Michigan Man.
SOURCE: 1997 F-350 Ford Powerstroke4x4 Crew
Have you changed your oil? Rotella 15W-40. These engines really don't like old oil. It becomes too thick for the injection pump to work correctly. Another possibility is a bad cam sensor on the front of the motor. Most engines call this the crank sensor but on this engine you have to look it up as a cam sensor.
SOURCE: Taurus 2003 idling problems
mcdevito75 here, Sounds like the idle speed motor, Ford is known for these idle speed motors going bad, in the later stages the car races like crazy. have your repair shop check this idle speed motor and change it.
SOURCE: 2001 taurus dohc codes 171
There is a large vac line coming straight down from the throttle body that goes to the PCV system. See if it has a hole in it. It is likely sucking air.
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