the power steering
you can try removing the drive belt
and start and see if the noise still
may be bearing , belt , pulley or the pump is worn out
the knock to the left
jack the car and inspect wheel bearing , suspension strut is tight , shock absorber not broken,the coil spring not broken and extended fully
have you done any work in the steering lately
he last one could be the reason for damage
as a general rule
look to the tyres and see any uneven wear , angle of tyre to the ground , distance between tyre and body from the back are equal on both sides
if the steering tend to shake and you see trace of rubber on clean concrete floor
then there is something wrong in steering rack end adjustment
as a general rule , you measure the distance between the wheel and reference point on chassis and same for the other side
then make distance between the wheels shorter 10 mm on the front the car
is called toe in, you use tape , and adjust the rack end yourself
it is approximate way
but will give you stable steering
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