fail safe mode light on 2005 Ford Five Hundred

what causes fail safe mode light to come on every mile or so and completely shut the engine off?

by in Deridder, LA on January 04, 2011
2 answers
ANSWER by on January 04, 2011
usally has to do with fly by wire system which replaces the old cable style. when there is a malfunction, the light comes on and the vehicle returns to dile with a slight increase to at least keep you moving to the side of the road. you say it shuts off completely?? it should not but there may be a couple of issues here. Roy
ANSWER by on January 04, 2011
As Roy said, electronic throttle body concerns are fairly common for this first attempt at drive-by-wire in a Ford car (Ford Diesel Trucks have been using drive by wire for a while). Throttle position sensors are at issue, and the ETB itself. They had a back order on replacement parts for months back in 2009 on these.

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