Description
Factory Mercedes S Class S450 4Matic Workshop Manual (2017–2020)
This is the official factory-level service manual for the W222-chassis Mercedes S450 4Matic — the same technical reference relied upon by authorized Mercedes-Benz dealership technicians across the United States for diagnosis, repair, and scheduled maintenance.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | M256 3.0L inline-6 turbocharged with EQ Boost mild hybrid (~362 hp / 369 lb-ft) |
| Diesel | N/A |
| Transmissions | 9G-TRONIC 9-speed automatic |
| Drive | 4Matic all-wheel drive (AWD) |
| Model Years | 2017, 2018, 2019, 2020 |
| Badge Twins | W222 standard wheelbase & V222 long-wheelbase (Maybach platform excluded) |
Common S450 4Matic Repairs Covered
| System | Procedures |
|---|---|
| Air Suspension (AIRMATIC) | Compressor replacement, air strut service, ride-height sensor calibration — a known wear item on W222 models |
| EQ Boost 48V Mild Hybrid | Integrated starter-generator diagnosis, 48V belt-drive service, fault code procedures |
| 9G-TRONIC Transmission | Fluid and filter service, valve body inspection, shift adaptation reset |
| Electrical / COMAND | Wiring diagrams, connector pin assignments, driver-assistance module replacement, infotainment diagnostics |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
Is the W222 AIRMATIC air suspension system covered in detail?
Yes. The manual includes complete AIRMATIC procedures for the W222 S450 4Matic, covering compressor diagnosis and replacement, front and rear air strut removal, ride-height sensor calibration, and pressure testing. Air suspension faults are among the most frequently reported issues on this generation S-Class, making this section particularly valuable.
Does this manual cover both standard and long-wheelbase S450 4Matic variants?
Coverage applies to both the standard-wheelbase W222 and the long-wheelbase V222 S450 4Matic built between 2017 and 2020. The Mercedes-Maybach S-Class variants on a stretched platform are not included in this manual.
Are the 48V EQ Boost mild hybrid components documented?
Yes. The M256 engine in the 2017–2020 S450 4Matic uses an integrated 48V starter-generator (EQ Boost). The manual covers the belt-driven ISG unit, 48V lithium-ion auxiliary battery, power electronics, and relevant fault-finding procedures specific to this mild hybrid architecture.
What format is the manual?
This manual is delivered as a PDF file. After purchase you receive an instant download link. The file is searchable, zoomable, and printable on any device using a standard PDF reader. Your download remains accessible for life through your account.
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