Mercedes-Benz W204 pulling to the right
Mercedes-Benz W204 pulls to the right: what usually fixes it?
The cause varies from car to car, but often adjusting the front caster angle (the lengthwise tilt of the wheel) with adjustment bolts helps. Sometimes new control arms are needed as well. The tyres are usually not the cause if swapping the tyres does not change the pull.
Mercedes-Benz W204: what should I ask for at the alignment?
Ask that caster and camber (the sideways tilt of the wheel) are adjusted, not just measured. After that the car is aligned with a four-wheel alignment. Caster cannot always be adjusted without separate adjustment bolts, and camber cannot be adjusted on all control arms.
Mercedes-Benz W204: what is checked if the angles are within tolerance but the car still pulls?
Check the control arm bushings and joint play before adjusting. The angles can be within the permitted limits even though the car pulls, and then the solution can be eccentric adjustment bolts or replacing worn lower control arms. Leave the work to a professional.