Mercedes S-Class W221 ABC Hydraulic System Leak
The Active Body Control hydraulic system on petrol W221 S-Class develops leaks at the hydraulic struts, pump or reservoir. Green hydraulic fluid visible under the car. The ABC warning illuminates and handling becomes unpredictable. Leaking strut repairs cost £600-1,200 each. Pump failure is rarer but costs £1,500-2,500.
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No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this Mercedes-Benz S-Class 2005 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
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