🏷️ Basic Information Identification Make: Mercedes-Benz Model: S420 Year: 1997 Generation Chassis Code: W140 Codes Engine Code: M119.980 👋 Introduction Market Position Market Position: The 1997 Mercedes-Benz S420 represented the pinnacle of German luxury and engineering in its era, competing with other flagship luxury sedans like the BMW 7 Series, Lexus LS, and Audi A8. This manual caters to owners and technicians maintaining these high-end vehicles. Competitive Analysis Competitive Analysis: The W140 S-Class was known for its robust build quality, advanced technology for its time, and unparalleled comfort. Servicing these vehicles requires specialized knowledge and access to factory-level information, making this manual an essential tool. Key Features Key Features: Official factory documentation ensures accuracy and completeness. Digital format allows for quick searching and easy access to specific repair procedures, diagnostic information, and wiring diagrams. Essential for maintaining the complex systems of a 1997 S-Class. 📋 Manual Details Coverage Areas Coverage Areas: Complete service, repair, diagnostic, troubleshooting, and wiring diagrams for the 1997 Mercedes-Benz S420. Wiring Diagrams: Includes comprehensive electrical system wiring diagrams for all major vehicle systems, aiding in troubleshooting and repair of electrical faults. Page Count Page Count: Estimated 1000+ pages (typical for comprehensive official service manuals of this era). Manual Type Manual Type: Official Factory Service & Repair Manual Software (Digital Format) Language Language: English Format Format: Software (likely executable or specialized viewer format designed for dealership technicians). 📖 Manual Coverage Systems Covered Systems Covered: Engine mechanical & electronic systems, fuel & emissions control, cooling system, lubrication system, ignition system, transmission (automatic), drivetrain (rear-wheel drive), suspension (front & rear), steering system, braking system (ABS, ESP), climate control, power accessories (windows, seats, mirrors, sunroof), lighting, body electrical, bodywork & interior, diagnostic trouble codes (DTCs), wiring diagrams. Procedures Included Procedures Included: Scheduled maintenance, routine inspections, diagnostic procedures, repair and replacement of all major and minor components, component testing, torque specifications, electrical system troubleshooting, wiring harness repair, body panel alignment, interior trim removal and installation, A/C system servicing. Component Removal Installation: Detailed, step-by-step instructions for the removal and installation of virtually every component, from minor trim pieces to major mechanical assemblies. Technical Depth Technical Depth: Comprehensive, from basic fluid changes to full engine and transmission overhauls, including detailed diagnostic trees and component-level repair instructions. Suitable for professional technicians and advanced DIY enthusiasts. Diagnostic Tools Diagnostic Tools: Procedures may require Mercedes-Benz specific diagnostic tools such as STAR DIAGNOSIS (or earlier equivalents like HHT - Handheld Tester) for accessing ECU data, performing actuator tests, and clearing fault codes. The manual will detail which systems require such tools. 📊 Manual Specifications File Format File Format: Proprietary software format, likely requiring a specific application or executable to view. Designed for digital access and searchability. Print Quality Print Quality: N/A (Digital Software). Content is typically rendered digitally with high-resolution diagrams and clear text. Binding Type Binding Type: N/A (Digital Software). Paper Type Paper Type: N/A (Digital Software). Completeness Completeness: This software is presented as a complete official factory service and repair manual, covering all aspects of vehicle maintenance and repair as intended by the manufacturer. Searchability Searchability: Software format allows for full-text searching, enabling users to quickly locate specific information or procedures. ⚙️ Engine Specifications Primary Engine Engine Type: 4.2L V8 SOHC 32-valve Engine Displacement: 4196 cc (256 cu in) Engine Bore X Stroke: 88.5 mm x 86.0 mm Engine Compression Ratio: 10.0:1 Performance Horsepower: 275 hp @ 5700 rpm (approx.) Torque: 295 lb-ft @ 3900 rpm (approx.) Fuel System Fuel Injection: Bosch Motronic M2.8.3 (Electronic Fuel Injection) Fuel Type: Premium Unleaded Gasoline (91 octane or higher recommended) Engine Management Engine Management System: Engine Control Unit (ECU) with integrated diagnostics. Ignition System: Distributorless Ignition System (DIS) with coil-on-plug or coil-pack setup (specific configuration may vary). Emission Controls: Catalytic converter, oxygen sensors, EGR (Exhaust Gas Recirculation) if applicable to the specific market's emissions standards. 🔧 Transmission Standard Transmission Type: 4-Speed Automatic Transmission (722.6 Electronic) Transmission Features: Electronic control, torque converter lock-up, multiple shift modes (e.g., Comfort, Sport). Optional Optional Transmission: N/A for S420 model in 1997, 4-speed automatic was standard. Fluid Specifications Transmission Fluid Type: MB 236.10 or MB 236.12 specification automatic transmission fluid (e.g., Shell ATF 134, Mobil ATF 220). 📐 Dimensions Exterior Wheelbase: 3,139 mm (123.6 in) Length: 5,108 mm (201.1 in) Width: 1,886 mm (74.3 in) Height: 1,486 mm (58.5 in) Weights Curb Weight: 1,960 kg (4,321 lbs) approx. Gross Vehicle Weight Rating: Approx. 2,500 kg (5,512 lbs) - consult vehicle's data plate for precise figure. Wheels Tires Wheel Bolt Pattern: 5x112 Standard Wheel Size: 16 x 7.5 inches Standard Tire Size: 215/60R16 🛡️ Safety Features Ratings Crash Test Ratings: NHTSA ratings for this generation were not standardized as they are today. However, the W140 was engineered with advanced safety features for its time. Active Features Active Safety Features: Anti-lock Braking System (ABS), Acceleration...