This comprehensive service and repair manual covers all aspects of maintaining, servicing, diagnosing, and repairing your 1988 Mercedes W126 SEC. It provides the same detailed information used by technicians at Mercedes dealerships.

The manual is packed with step-by-step instructions, diagrams, illustrations, wiring schematics, and specifications. It covers everything from basic maintenance tasks to complex engine repairs, ensuring you have all the information you need to tackle any project with confidence.

The manual includes sections on:

* **Maintenance:** Routine maintenance procedures, schedules, and fluid specifications.
* **Engine:** Detailed information about the engine, including components, operation, troubleshooting, and repair procedures.
* **Control System:** Diagnosis and repair of the engine control system, including sensors, actuators, and wiring.
* **Mechanical:** Comprehensive coverage of mechanical systems, including the transmission, suspension, brakes, steering, and drivetrain.
* **Fuel Service Specifications:** Detailed information on fuel systems, including injectors, fuel lines, and fuel pumps.
* **Emission Control:** Diagnosis and repair of emission control systems, including catalytic converters and exhaust systems.
* **Intake Exhaust Cooling:** Troubleshooting and repair of the intake and exhaust systems, including cooling systems.
* **Lube:** Recommended lubricants and lubrication procedures for all vehicle components.
* **Ignition Starting Charging:** Diagnosis and repair of the ignition, starting, and charging systems, including spark plugs, ignition coils, and the alternator.
* **Auto Transmission Clutch:** Diagnosis and repair of the automatic transmission, including clutches, gearboxes, and hydraulic systems.
* **Manual Transmission:** Diagnosis and repair of the manual transmission, including gearboxes, shift mechanisms, and clutches.
* **Transfer Propeller Shaft:** Information on the transfer case, propeller shafts, and drive shafts.
* **Drive Shaft:** Diagnosis and repair of the drive shafts, including universal joints and axles.
* **Differential:** Detailed coverage of the differential, including gear ratios, lubrication, and repair procedures.
* **Axle Suspension:** Diagnosis and repair of the suspension system, including shock absorbers, springs, and control arms.
* **Tire & Wheel:** Information on tires, wheels, and wheel alignment.
* **Brake Control:** Diagnosis and repair of the brake control system, including ABS and traction control.
* **Brake:** Detailed information on brakes, including calipers, rotors, pads, and brake lines.
* **Parking Brake:** Troubleshooting and repair of the parking brake system.
* **Steering Column:** Diagnosis and repair of the steering column, including steering wheel and steering gear.
* **Power Steering:** Diagnosis and repair of the power steering system, including pumps and hoses.
* **Air Condition:** Repair and maintenance of the air conditioning system, including refrigerant charging and troubleshooting.
* **Suppl Restraint System:** Information on the supplemental restraint system, including airbags and seatbelts.
* **Seat Belt:** Diagnosis and repair of the seatbelt system.
* **Engine Immobilizer:** Information on the engine immobilizer system, including key programming and troubleshooting.
* **Cruise Control:** Diagnosis and repair of the cruise control system.
* **Wiper & Washer:** Troubleshooting and repair of the wiper and washer systems.
* **Door Lock:** Information on door locks, including power locks and keyless entry.
* **Meter Audio/Visual:** Diagnosis and repair of the instrument cluster, gauges, and audio/visual systems.
* **Horn:** Troubleshooting and repair of the horn system.
* **Windshield/Glass Mirror:** Information on windshield replacement, glass repair, and mirror adjustment.
* **Instrument Panel:** Diagnosis and repair of the instrument panel, including switches and controls.
* **Seat:** Troubleshooting and repair of the seat system, including adjustments and heating/cooling systems.
* **Engine Hood/ Door:** Information on the engine hood and doors, including latches and hinges.
* **Exterior & Interior:** Information on exterior and interior components, including trim, lights, and upholstery.
* **Electrical:** Comprehensive coverage of the electrical system, including wiring diagrams, fuses, and components.
* **Multiplex/ Can Communication:** Information on the Multiplex and CAN communication systems.
* **And much more...**

This manual is your complete reference for all things related to your 1988 Mercedes W126 SEC.

The 1988 Mercedes W126 SEC, a masterpiece of automotive engineering, stands as a testament to the brand's unwavering commitment to luxury, performance, and longevity. This iconic coupe, known for its elegant design and powerful engine, was the pinnacle of automotive sophistication in its era. The W126 chassis, introduced in 1979, was a revolutionary design featuring a robust unibody construction and a double-wishbone suspension. The SEC, a shortened and sleeker variant of the S-Class, offered a captivating blend of comfort and sportiness. Its aerodynamically sculpted body, adorned with distinctive chrome accents, exuded an aura of timeless elegance. The interior, crafted with meticulous attention to detail, featured supple leather upholstery, burled walnut wood accents, and an array of advanced amenities for its time.

At the heart of the 1988 SEC resided a range of powerful engines, each delivering exhilarating performance. The most sought-after variant was the 560 SEC, equipped with a 5.6-liter V8 engine capable of generating 300 horsepower. This potent engine, paired with a smooth-shifting four-speed automatic transmission, propelled the SEC to a top speed of 150 mph. The SEC's handling was equally impressive, thanks to its precise steering and responsive suspension, allowing for a spirited driving experience. Beyond its performance capabilities, the 1988 Mercedes W126 SEC embodied the brand's reputation for exceptional build quality and reliability. Built with precision and meticulous attention to detail, these vehicles were known for their durability and longevity, making them highly sought-after collector's items today.