Mercedes-Benz S-Class 2009

2009 Mercedes-Benz S-Class: what owners report

• Guides say the W221's 7G-Tronic can develop shifting faults a software update does not always cure, one cause being a failing control-unit conductor plate; on the 2007 S550 the top US complaint is difficulty going into gear.2006–2013
• Press buying guides say the W221's Airmatic air suspension struts fail fairly often, and a corner that dips down points to a leaking air spring or hose or a worn pump.2006–2013
• Press guides describe W221 electrics as fragile with age: instrument cluster display faults, a battery that drains when the car stands, failing seat control units and keyless entry errors.2006–2013
• The W221 is packed with complex systems, so fault finding often needs Mercedes' own diagnostics and repairs are expensive; Active Body Control on V12 and AMG cars is especially costly.2006–2013