The 2012 Mercedes R-Class (W251) Service and Repair Manual provides comprehensive information for maintaining, servicing, diagnosing, and repairing your vehicle. This manual is the same resource used by technicians at authorized dealerships. It includes detailed step-by-step instructions, diagrams, illustrations, wiring schematics, and specifications for every aspect of your Mercedes R-Class. Whether you're tackling a routine maintenance task or a complex repair, this manual will guide you through the process. The content spans a wide range of systems, including:

* **Engine:** Detailed information on engine components, operation, diagnostics, and repair procedures.
* **Control System:** Coverage of electronic control units (ECUs), sensors, actuators, and troubleshooting strategies.
* **Mechanical Components:** Comprehensive instructions for servicing and repairing transmissions, axles, suspension, brakes, steering, and more.
* **Fuel Service Specifications:** Detailed information on fuel systems, including injection systems, fuel lines, and fuel tank.
* **Emission Control:** Guidance on diagnosing and repairing emission control systems, ensuring your vehicle meets environmental standards.
* **Intake, Exhaust, and Cooling Systems:** In-depth coverage of these vital systems, including troubleshooting and repair procedures.
* **Lube:** Specific recommendations for lubricants and fluids used in your R-Class.
* **Ignition, Starting, and Charging Systems:** Thorough instructions for these essential systems, including troubleshooting and repair procedures.
* **Auto and Manual Transmissions:** Detailed information on both automatic and manual transmissions, including troubleshooting and repair procedures.
* **Drivetrain:** Coverage of the transfer case, propeller shaft, driveshafts, differentials, and axles.
* **Suspension:** Comprehensive information on suspension components, including diagnostics and repair procedures.
* **Tire and Wheel:** Information on tire sizes, wheel specifications, and maintenance procedures.
* **Braking System:** Extensive coverage of brake components, including troubleshooting and repair procedures.
* **Steering:** Detailed information on steering components, including diagnostics and repair procedures.
* **Climate Control:** Instructions for servicing and repairing the air conditioning system.
* **Safety Systems:** Coverage of the supplemental restraint system (SRS), seat belts, and engine immobilizer system.
* **Electrical Systems:** Extensive information on electrical components, including wiring diagrams, diagnostics, and troubleshooting.
* **Body and Interior:** Information on servicing and repairing exterior body components, interior trim, and other related systems.
* **Multiplex/CAN Communication Systems:** Guidance on diagnosing and repairing the vehicle's communication network.

This comprehensive manual is compatible with all versions of Windows and Mac operating systems, allowing you to easily access the information you need. You can print the pages and diagrams that are relevant to your specific task.

The 2012 Mercedes-Benz R-Class (W251) was a luxury crossover SUV that aimed to bridge the gap between the practicality of a minivan and the sophistication of a traditional luxury car. This second-generation R-Class, produced from 2006 to 2012, featured a distinctive, boxy design with a spacious interior and versatile seating configurations. It offered a choice of powerful, fuel-efficient engines, including V6 and V8 options, and advanced technology features that were ahead of their time. The R-Class was praised for its smooth ride, comfortable interior, and impressive cargo space, making it an appealing option for families and individuals seeking a blend of luxury and practicality.

Despite its unique attributes, the R-Class struggled to find its place in the market. Its awkward styling and the rise of more popular SUV models like the BMW X5 and Audi Q7 led to relatively low sales figures. Mercedes discontinued the R-Class in 2012, opting to focus on other segments of the luxury market. Although its production run was relatively short, the 2012 R-Class remains a testament to Mercedes-Benz's commitment to innovation and the exploration of new vehicle categories. It provided a unique blend of luxury, versatility, and practicality, showcasing the brand's ability to push boundaries and reimagine the traditional SUV formula. While not a commercial success, the R-Class left a lasting impact on the automotive landscape, showcasing the potential of a vehicle that aimed to cater to a niche market with a blend of luxury and practicality.