There is a special tool needed to remove the fuel lines, the tool is not expensive. The filter is located under the vehicle just forward of the fuel tank there is a 10mm bolt holding it to the vehicle.
Yes
no
When you change the oil and oil filter.
how change brake fluid . i have ford focus lx 2000.ans how change air filter.
Change the fuel filter.
Very Carefully
5w20
ignition switch
Probably the fuel filter. Change it.
According to the 2002 Ford Focus owners manual : With engine oil filter change : The 2.0 liter Zetec engine takes ( 4.25 liters / 4.5 quarts ) The 2.0 liter SPI engine takes ( 3.78 liters / 4.0 quarts )
You need a 6mm and 10mm socket, ratchet and short extension, in 1/4". and a pair of pliers.
On a 2002 Ford Focus : The Mass Air Flow sensor is between the engine air filter and the large diameter engine air intake tube * it is installed in the top section of the engine air filter housing