Yes no problems at all as the mk4 and 5 are basicly the same car.
Negative i believe
You need to be specific as to year or Mk of Fiesta and as to which engine is fitted as they're all different.
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.
1 monkey ball and 6 fluff munchies
Put your nans titts underneath it
100 monkey coins and 120 fluff munchies
http://www.fiestaguides.co.uk/content/interior.html
It is located inside the engine block itself and is sends a signal to the ECU. The ECU then switches the fan on.
It is the Check Engine light. It comes on when the ECU detects a problem with the emissions system. Can be as simple as a loose gas cap or can be serious. Have the ECU scanned.
passenger side footwell. behind the plastic in the kickpanel
Depends which model of Fiesta. There have been many styling changes over the years and many different types of light fittings. Please be specific as to year or Mk number.