Mercedes W221 S-Class Steering Lock Actuator Fault
The electronic steering column lock on W221 S-Class fails, leaving the car unable to start. The ignition turns but the steering lock does not disengage. The EIS (Electronic Ignition Switch) and ELV (Electronic Steering Lock) are integrated in the column. Repair requires Mercedes diagnostic software and replacement of the ELV unit, costing £400-800.
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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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