Diagnose the right and the left or the front and the rear bumper energy absorbers separately. Check each energy absorber separately for the following.

Some oil wetting may be visible due to the grease packed in the crimp recess. Therefore, a stain or a trace of oil on the piston tube near the crimp is normal. However, if oil drips continuously from the crimp or from the stud end of the energy absorber, replace it.