ask a local car shop if you live near one. i am not a car erson, but if i were you, i would have a little look for your battery
how do i change the alternator in my 2001 ford focus?
under the battery.
How do you remove and replace the battery on a 2001 Ford F150?
how to open and change the battery of ford focus 56 reg
12 volt.
http://myfordfocus.com/how-to/starter.htm
Change the fuel filter.
See answer on "How do you change the front brake pads on a 2001 Ford Focus?" for a description of the location of the resivoir. The answer to this exact location is at the bottom of that answer.
What type of battery do i need for a 2002 ford focus
Drop the gas tank.
How do you remove the brake light cover on a ford focus
The 2001 Ford Focus has 16 valves.