FORD 2015 Fiesta - Manual (Page 156)

5. Disconnect the negative (black) cable
from the battery. The door key is
needed to lock and unlock doors when
the battery cable is disconnected. Also,
the anti-theft system is disabled until
the battery cable is reconnected. See
Changing the 12V Battery (page 186).
Note: The maximum towing speed is 70
mph (113 km/h).
Note: There is no limit on towing distance.
After towing, start the engine within 15
minutes of reconnecting the battery cable.
See Changing the 12V Battery (page 186).
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Fiesta (CCT), enUSA, Second Printing
Towing