This comprehensive 1991 Mercedes W126 SE Service and Repair Manual provides detailed instructions, diagrams, illustrations, wiring schematics, and specifications for maintaining, servicing, diagnosing, and repairing your vehicle. It covers all models and all repairs from A to Z, offering the same information used by technicians at Mercedes dealerships. You'll find everything you need to tackle any repair with confidence, including:

* **Maintenance:** Routine maintenance procedures for keeping your W126 in top condition.
* **Engine:** In-depth coverage of engine components, from the block and heads to the fuel system and emissions control.
* **Control System:** Troubleshooting and repair guidance for engine control systems.
* **Mechanical:** Detailed explanations and repair procedures for all mechanical components, including the transmission, axles, suspension, and steering.
* **Fuel Service Specifications:** Precise specifications for fuel systems and components.
* **Intake Exhaust Cooling:** Complete information for maintaining and repairing intake and exhaust systems, as well as cooling systems.
* **Lube:** Guidelines for proper lubrication and fluid changes.
* **Ignition Starting Charging:** Detailed instructions for diagnosing and repairing ignition, starting, and charging systems.
* **Auto Transmission Clutch:** Repair and maintenance procedures for automatic transmissions and clutches.
* **Manual Transmission:** Comprehensive coverage of manual transmissions and related components.
* **Transfer Propeller Shaft:** Information on transfer cases, propeller shafts, and related drivetrain components.
* **Drive Shaft:** Repair and maintenance procedures for drive shafts.
* **Differential:** Detailed guidance for diagnosing and repairing differentials.
* **Axle Suspension:** Complete instructions for maintaining and repairing axles and suspension systems.
* **Tire & Wheel:** Guidance on tire selection, maintenance, and repair, along with wheel information.
* **Brake Control:** Troubleshooting and repair instructions for brake control systems.
* **Brake:** Comprehensive coverage of brake components and repair procedures.
* **Parking Brake:** Repair and maintenance information for parking brakes.
* **Steering Column:** Detailed instructions for diagnosing and repairing steering columns.
* **Power Steering:** Complete information on power steering systems, including troubleshooting and repair procedures.
* **Air Condition:** Comprehensive coverage of air conditioning systems, including refrigerant handling, component repair, and troubleshooting.
* **Suppl Restraint System:** Information on supplemental restraint systems, including airbags and seat belts.
* **Seat Belt:** Details on seat belt systems, maintenance, and repair.
* **Engine Immobilizer:** Troubleshooting and repair instructions for engine immobilizer systems.
* **Cruise Control:** Information on cruise control systems, including troubleshooting and repair.
* **Wiper & Washer:** Guidance for maintaining and repairing wiper and washer systems.
* **Door Lock:** Repair and maintenance procedures for door locks.
* **Meter Audio/Visual:** Troubleshooting and repair information for instrument panels, gauges, and audio/visual systems.
* **Horn:** Repair and maintenance procedures for horns.
* **Windshield/Glass Mirror:** Information on windshield and glass replacement, as well as mirror repair.
* **Instrument Panel:** Details on instrument panel components and repair.
* **Seat:** Repair and maintenance information for seats, including upholstery, mechanisms, and heating/cooling systems.
* **Engine Hood/Door:** Guidance for maintaining and repairing engine hoods and doors.
* **Exterior & Interior:** Information on exterior and interior components, including trim, paint, and upholstery.
* **Electrical:** Comprehensive coverage of electrical systems, including wiring diagrams and troubleshooting procedures.
* **Multiplex/Can Communication:** Information on multiplex and CAN communication systems.
* **And much more...**

The 1991 Mercedes-Benz W126 SE, a model that epitomized luxury and engineering excellence, marked the final year of production for this iconic sedan. A successor to the W116, the W126 was introduced in 1979 and redefined the notion of luxury cars, setting the stage for a new era of automotive sophistication. The SE, an abbreviation for "Sonderklasse" (Special Class), was the top-of-the-line trim level, offering the most luxurious appointments and powerful engine options. This particular model featured a range of powerful engines, including the 3.0L inline-six, 4.2L V8, and the legendary 5.0L V8, renowned for its smooth power delivery and effortless acceleration. The W126 SE was available in various body styles, including the standard sedan, the extended wheelbase "SEL," and the opulent "S-Class Coupe" (C126).

The 1991 W126 SE showcased Mercedes-Benz's dedication to quality, craftsmanship, and safety. Its sophisticated engineering was evident in features like the independent suspension system, power-assisted steering, and anti-lock braking system (ABS). The interior was a haven of luxury, boasting plush leather upholstery, premium wood trim, and advanced amenities such as air conditioning, power windows, and a premium sound system. The W126 SE was a testament to its era's advanced engineering and design, offering a combination of performance, luxury, and safety that was unmatched in its time. This iconic Mercedes sedan continues to be cherished by enthusiasts and collectors worldwide for its timeless elegance, engineering prowess, and enduring legacy.