it depends on the model, but generally the ECU is usually located behind the battery. its a kind of grey/silver metal box with a bit electrical plug going to it its in the pasenger side footwell
The 2012 Ford Fiesta has a 8 ft. 2 in. (98 in.) wheel base.
The 2014 Ford Fiesta has a 8 ft. 2 in. (98 in.) wheel base.
The 2011 Ford Fiesta has a 8 ft. 2 in. (98 in.) wheel base.
The 2013 Ford Fiesta has a 8 ft. 2 in. (98 in.) wheel base.
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The Ford Festiva ECU valve can be found on the firewall in the engine compartment. The valve will be on the drivers side of the engine compartment.
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http://www.fiestaguides.co.uk/content/interior.html
it is inside the bell housing
passenger side footwell. behind the plastic in the kickpanel
It is located inside the engine block itself and is sends a signal to the ECU. The ECU then switches the fan on.
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