2012 Mercedes-Benz S400 Service and Repair Manual

This factory service and repair manual for the 2012 Mercedes-Benz S400 covers the Hybrid trim, the only one listed, in its four-door sedan body. Behind that name is a gasoline 3.5L V6 working as a full hybrid, with dual overhead cams and no forced induction. That means two layers of service, the conventional engine and the hybrid drive, and the manual handles both along with the transmission, brakes, suspension and body electrics.

Engines covered

• 3.5L V6 full hybrid — DOHC, naturally aspirated, gasoline

Body styles covered

• 4-door sedan

Trims covered

• Hybrid

Known issues on the 2012 S400. Two recalls are logged for the 2012 S400. One covered certain vehicles whose fuel filter flange, weakened by a molding irregularity during a 2011 production window, could crack under heat and leak fuel, creating a fire risk; the fix was a new filter. The other covered certain S400 Hybrid vehicles built between March and July 2011, whose tire pressure warning would not return at later starts if all four wheel sensors had failed or gone missing; dealers reprogrammed the monitoring unit. This car's single complaint involves stability control, the electrical system and the engine, while a single power train complaint sits with the 2012 S-Class line. Fuel, tire pressure and stability systems get procedures, wiring diagrams and diagnostics.