Check for loose/worn steering components i.e. tie rod ends, ball joints
When you turn the wheel, or while you drive?
cv joint damage.repack or change it. repacking may do to solve your problem
sounds like the right front motor mount .i replaced mine and the clunking sound went away
probably a blown head gasket
Ford focus with 2.0 eng.zetec
Check to make sure that the fluid is full. With a helper and the vehicle sitting still in park, move the steering wheel fully side to side while one of you listens at the wheels to find the noise.
Mecron ATF is used for the Ford Focus.
Program a new key and ignition to a 2000 ford focus
In the steering column.
Check the fluid in the power steering. If it is low the car will make noise when you turn the wheel.
wheel bearing
According to the 2003 Ford Focus Owner Guide : ( Motorcraft MERCON automatic transmission fluid is used as the power steering fluid )