31 00... Information on replacing shock absorbers: Situation
WARNING: This page is about a different car, the 2010 MINI Cooper and 2009 MINI Cooper. However, it is still accessible from the selected car via links, so may be relevant.
When a shock absorber is faulty on one side (leaking, noises, limit values exceeded on the shock tester), often both shock absorbers on the axle in question are replaced.