Description
Factory Mercedes S Class S450 Workshop Manual (2017–2020)
This is the factory-level service manual for the W222 Mercedes-Benz S450, covering every repair and maintenance procedure needed by US technicians and owner-operators working on 2017–2020 model year vehicles.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | M256 3.0L inline-six turbocharged with EQ Boost mild-hybrid integrated starter-generator (~362 hp) |
| Diesel | N/A |
| Transmissions | 9G-TRONIC 9-speed automatic |
| Drive | RWD; 4MATIC AWD |
| Model Years | 2017, 2018, 2019, 2020 (incl. facelift variants) |
| Badge Twins | W222 S-Class (standard wheelbase & long-wheelbase V222) |
Common S450 Repairs Covered
| System | Procedures |
|---|---|
| EQ Boost Mild-Hybrid / ISG | Integrated starter-generator diagnosis, 48V belt-drive system inspection, auxiliary battery replacement |
| Air Suspension (AIRMATIC) | Compressor replacement, strut leaks, ride-height sensor calibration — a known W222 concern |
| 9G-TRONIC Transmission | Fluid and filter service, valve body diagnostics, adaptive shift programming reset |
| Engine Cooling & Thermostat | M256 thermostat housing replacement, coolant flush intervals, water pump inspection procedures |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
Is the AIRMATIC air suspension system covered in this manual?
Yes. The manual includes complete AIRMATIC diagnostic and repair procedures, including compressor overhaul, strut replacement, ride-height sensor calibration, and fault code interpretation — critical coverage given that air suspension leaks are among the most frequently reported issues on W222 S-Class vehicles.
Does this manual cover both standard and long-wheelbase S450 variants?
Yes. The W222 platform spawned both the standard-wheelbase S450 sedan and the long-wheelbase V222 body. This manual covers both configurations for the 2017–2020 production run, including facelift updates introduced mid-cycle.
Are the 48V EQ Boost mild-hybrid components addressed?
Yes. The M256 engine in the S450 uses an integrated starter-generator driven by a 48V belt system. The manual includes diagnosis, component testing, and replacement procedures for the ISG unit and associated 48V auxiliary battery, which are unique to this powertrain generation.
What format is the manual?
This manual is delivered as a fully searchable PDF file. After purchase you receive an instant download link; there are no shipping delays. The file is compatible with any PDF reader on Windows, Mac, iOS, or Android, and individual pages can be printed for shop use.
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