[GrahamBrown1]

As part of normal operation once shut down the car performs a self clean of the egr using the stepper motor attached to the front of the valve. This basically moves the valve in and out. What happens normally is when the valve starts to clog the motor finds it harder to move the valve and eventually strips the internal gears. So not only do you get a non functioning egr valve but also a worn out motor.

The best fix is a new motor and valve as you know it’s not the easiest area to work in so may as well do them both together. I had to sort this on my 150k mile s60 before I sold it.