1998 Mercedes S420 Service & Repair Manual (PN 119.981)

• Document and size: A 1,634-page set made up of 74 Mitchell Repair Information Article Print PDFs for the 1998 Mercedes-Benz S420. It is a compiled aftermarket service-information set, not one Mercedes-Benz factory publication. Grouped by subject, the total comprises 458 engine/performance/cooling/emissions pages; 120 transmission/driveline; 120 brakes; 224 steering/suspension/alignment; 92 HVAC; 446 electrical/body/security/restraint; 42 maintenance; and 132 general-reference pages.

• Vehicle identification: Primary coverage is the 1998 S420 long-wheelbase sedan, body code 140.043, with the M119.981 4.2L ME-SFI V8 and 722.622 five-speed automatic transmission. Shared articles also identify 1997-98 S420, S500, and SL500 applications, the 1997 E420, and the 1998 CL500, but the collection is not a complete service set for each of those additional models.

• M119 engine repair: Covers camshaft basic timing and valve-timing checks, engine removal and installation, cylinder-head work, crankshaft seals, timing-chain tensioner and slide rails, camshaft adjusters and camshafts, oil-pan service, and cylinder-head/block inspection. Tables cover torque sequences, bore and piston groups, bearings, ring clearances, wear limits, and lubrication data.

• Powertrain diagnosis: The Engine 119 ME-SFI material provides code retrieval and clearing, symptom diagnosis, ECM connector identification, version coding, and fuel-injection, ignition, electronic-accelerator, cruise-control, injector, and fuel-pump test charts. W5A580/722.6 coverage adds transmission adaptation, limp-home and symptom diagnosis, TCM inputs/outputs, solenoid and circuit tests, fluid service, linkage adjustment, and transmission removal/installation.

• Chassis repair: Includes disc-brake service and overhaul, ABS/ASR V/ETS/BAS/ESP diagnosis by equipment level, hydraulic-unit bleeding, DTC and electrical tests, electronic power-steering diagnosis, front and rear suspension removal, rear level-control pressure release/refill, axle-shaft service, and riding-height and wheel-alignment procedures.

• HVAC and body systems: Automatic climate-control sections cover version coding, self-diagnostics, sensor and flap tests, front/rear unit service, refrigerant handling, and compressor work. Separate files handle PSE pneumatic central locking, Drive Authorization System/keyless entry, anti-theft, air bags and ETRs, power seats, power mirrors and steering column, window/sunroof synchronization and calibration, wipers, starting/charging, and parasitic-load testing.

• Diagrams and technical data: The set supplies component locators, connector views, vacuum schematics, diagnostic flowcharts, and system wiring. Representative sheets include 4.2L Engine Performance Circuits, the 1997-99 S420/S500 Transmission Wiring Diagram, Anti-lock Brake Circuits with ASR/ESP, the 1998-99 S-Class Automatic A/C-Heater Wiring Diagram, the S320/S420/S500 SRS Wiring Diagram, and the Central Locking System Vacuum Diagram.

Vehicle Match and Workshop Fit

The identification material separates chassis, engine, fuel-system, ignition, and transmission applications before a repair procedure or test chart is selected. The Engine 119 diagnostic article spans 1996-99 and identifies production-date breaks, including pre-/post-June 1996 systems and the SL500 change at September 1997. Tool callouts include Camshaft Pins 119 589 00 15 00, Hand-Held Tester 965 589 00 01 00, Multiplexer Cable 965 589 00 40 00, and Socket Box 129 589 00 21 00.

Because the procedures are condensed and many test paths assume an HHT, socket box, DVOM, refrigerant service equipment, or safe vehicle lifting, this set is suited to professional technicians and experienced owners already comfortable with late-1990s Mercedes systems.

Repair Depth and Known Limits

The engine chapter warns that an M119 camshaft can fracture if it is bent during bearing-cap installation. The transmission article also flags trapped metal debris in a contaminated torque converter as a cause of repeat transmission failure after repair.

Coverage is deep but uneven. The M119-specific article does not provide removal/installation procedures for the intake manifold, complete timing chain, water pump, or oil pump; its companion overhaul chapter is general piston-engine guidance. Several accessory chapters concentrate on diagnosis and wiring rather than component removal. The pneumatic door-lock article lacks its own 1998 wiring sheets, although the separate 1998 S420 system-diagram file includes a power-door-lock circuit. The set also contains all-makes tutorials and January 2002 Motorist Assurance Program inspection standards, which are general references rather than S420-specific factory procedures.

Air-bag, brake-hydraulic, refrigerant, loaded-suspension, and transmission-removal work requires the article-specific precautions and proper support, test, and service equipment.