This comprehensive 1990 Mercedes W126 SEL Service and Repair Manual provides you with the same in-depth information used by technicians at dealerships to maintain, service, diagnose, and repair your vehicle. This manual is not generic repair information; it is specifically tailored to the 1990 Mercedes W126 SEL model, ensuring you have the most accurate and detailed instructions.

The manual contains complete step-by-step instructions, detailed diagrams, illustrations, wiring schematics, and specifications for all repair procedures. You'll find extensive coverage of every aspect of your vehicle, including:

* **Maintenance:** Routine maintenance schedules, fluid checks and changes, filter replacements, and more.
* **Engine:** Detailed information on engine operation, troubleshooting, rebuild procedures, and component replacement.
* **Control System:** Comprehensive coverage of electronic control systems, including fuel injection, ignition, and emissions.
* **Mechanical:** In-depth instructions on repairing and replacing mechanical components such as the transmission, suspension, brakes, steering, and axles.
* **Fuel Service Specifications:** Precise information on fuel system components, calibration procedures, and troubleshooting guides.
* **Emission Control:** Detailed explanations of emissions systems, diagnostic procedures, and repair techniques.
* **Intake Exhaust Cooling:** Specific instructions for maintaining and repairing intake and exhaust systems, cooling components, and related systems.
* **Lube:** Detailed guide on lubricating systems, proper oil selection, and lubrication schedules.
* **Ignition Starting Charging:** Comprehensive coverage of ignition systems, starting systems, charging systems, and associated components.
* **Auto Transmission Clutch:** In-depth information on automatic transmission operation, troubleshooting, and repair procedures.
* **Manual Transmission:** Detailed instructions for manual transmissions, including shifting mechanisms, clutch systems, and repair procedures.
* **Transfer Propeller Shaft:** Thorough coverage of transfer cases, propeller shafts, and related components.
* **Drive Shaft:** Specific instructions on drive shafts, axle shafts, and related components.
* **Differential:** Detailed information on differential operation, troubleshooting, and repair procedures.
* **Axle Suspension:** In-depth coverage of axle and suspension systems, including components, adjustments, and repair procedures.
* **Tire & Wheel:** Comprehensive information on tire types, wheel specifications, and maintenance procedures.
* **Brake Control:** Detailed instructions on brake control systems, including hydraulics, ABS, and electronic systems.
* **Brake:** In-depth information on brake systems, including components, adjustment procedures, and repair techniques.
* **Parking Brake:** Specific instructions for parking brake systems, adjustments, and maintenance procedures.
* **Steering Column:** Detailed coverage of steering columns, components, and repair procedures.
* **Power Steering:** Comprehensive information on power steering systems, including operation, troubleshooting, and repair techniques.
* **Air Condition:** In-depth instructions on air conditioning systems, including components, troubleshooting, and repair procedures.
* **Suppl Restraint System:** Detailed information on supplemental restraint systems (airbags), including deployment, diagnostics, and repair procedures.
* **Seat Belt:** Specific coverage of seat belt systems, including adjustments, retractors, and repair procedures.
* **Engine Immobilizer:** Detailed information on engine immobilizer systems, operation, diagnostics, and troubleshooting.
* **Cruise Control:** Comprehensive coverage of cruise control systems, including operation, adjustments, and repair techniques.
* **Wiper & Washer:** In-depth instructions on windshield wiper and washer systems, including operation, diagnostics, and repair procedures.
* **Door Lock:** Detailed information on door lock systems, including mechanical and electrical components.
* **Meter Audio/Visual:** Comprehensive coverage of gauges, warning lights, and audio/visual systems.
* **Horn:** Specific instructions on horn systems, including operation, diagnostics, and repair techniques.
* **Windshield/Glass Mirror:** Detailed information on windshield and window systems, including replacement and repair procedures.
* **Instrument Panel:** Comprehensive coverage of instrument panel components, including gauges, switches, and controls.
* **Seat:** In-depth instructions on seat systems, including adjustments, upholstery, and repair procedures.
* **Engine Hood/ Door:** Detailed coverage of hood and door systems, including hinges, latches, and repair procedures.
* **Exterior & Interior:** Comprehensive information on exterior and interior components, including trim, paint, and upholstery.
* **Electrical:** In-depth coverage of electrical systems, including wiring diagrams, troubleshooting guides, and repair procedures.
* **Multiplex/ Can Communication:** Specific information on multiplex and CAN communication systems, including diagnostics and repair procedures.

This manual provides you with the knowledge and information to confidently handle a wide range of repairs and maintenance tasks on your 1990 Mercedes W126 SEL, saving you time and money.

The 1990 Mercedes-Benz W126 SEL is a testament to German engineering and luxury, representing the pinnacle of automotive excellence in its time. The W126 series, produced from 1979 to 1991, was a significant departure from its predecessor, the W116, boasting a more aerodynamic design, advanced technology, and improved comfort. The SEL, standing for "Sonderklasse Lang," translates to "Special Class Long" and designates the extended wheelbase version of the S-Class, providing ample space for passengers in the rear. The 1990 model year saw the introduction of a revised front fascia with a redesigned grille and bumpers, further enhancing the car's elegance. Under the hood, the SEL was powered by a range of powerful and refined gasoline engines, including the iconic 5.0L V8 and the 5.6L V8, offering a smooth and effortless driving experience.

The 1990 Mercedes W126 SEL was a technological marvel for its time, featuring numerous innovations that set it apart from the competition. The luxurious interior was meticulously crafted with high-quality materials and advanced features such as power-adjustable seats, automatic climate control, and a premium sound system. The car's advanced suspension and braking systems ensured a safe and comfortable ride, while its robust construction provided exceptional durability. The W126 series also introduced pioneering safety features such as anti-lock brakes (ABS) and a driver's airbag, further solidifying Mercedes-Benz's reputation for safety. The 1990 W126 SEL remains a highly sought-after classic, appreciated for its timeless design, exceptional performance, and enduring legacy as a symbol of automotive excellence.