Help!!! 2008 s320 lwb cdi sudden hard ride

[chiltern]

Hi Ive got a problem with my 2008 S320 cdi LWB with sudden hard ride Ive recently got the anti roll bar links changed and lower rear track control arms after changing all of these parts couple of days in noticed hard ride as if the car is stuck in S Mode Ive had the car on Autologic Diagnostic but no faults found any advice please thanks