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Q: while driving down the road the dash chimes and reads emergency saftey shut down on 2006 Ford Expedition

vhehicle is running but i just coast to a stop with no use of the gas pedal i shut it off and restart the engine and continue driving with all dash funtions normal. this has happened twice in 12 months.
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Not to say this is what you got going on,but throttle bodies are VERY common failure.Some engine sizes have a replaceable throttle position sensor and some are integral to the throttle body assembly.
Have a scan test that can see all modules and retrive ALL error codes. Your mechanic will know what to do.
Snap-On Modis scanner, for example, can do this.
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