Description
Factory Mercedes CLS400d 4Matic Workshop Manual (2018-2022)
This factory-level service manual delivers complete technical documentation for the C257-chassis Mercedes-Benz CLS400d 4Matic, covering every model year from 2018 through 2022. Written to dealer standards, it gives US-based technicians and enthusiasts the same repair depth found at a Mercedes-Benz main garage.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | N/A |
| Diesel | OM656 3.0L inline-6 turbodiesel with EQ Boost integrated starter-generator (~340 hp / 700 Nm) |
| Transmissions | 9G-TRONIC 9-speed automatic |
| Drive | 4Matic permanent AWD |
| Model Years | 2018–2022 |
| Badge Twins | N/A |
Common CLS400d Repairs Covered
| System | Procedures |
|---|---|
| OM656 EGR & Diesel Particulate Filter | DPF regeneration cycles, EGR valve removal/cleaning, fault code diagnosis for P246X series codes |
| EQ Boost 48V Mild-Hybrid System | Integrated starter-generator belt service, 48V battery health checks, ISG control unit diagnostics |
| 9G-TRONIC Transmission | Fluid and filter replacement, solenoid valve inspection, TCU adaptation reset procedures |
| MBUX & Electrical Architecture | CAN bus network diagrams, wiring schematics, LED Multibeam headlight module replacement, connector pinouts |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
Does the manual cover the EQ Boost mild-hybrid system on the OM656 engine?
Yes. The manual includes detailed procedures for the 48-volt EQ Boost integrated starter-generator, covering belt routing, ISG removal and installation, 48V battery inspection, and control unit diagnostics — all specific to the CLS400d’s OM656 drivetrain.
Which chassis generation does this manual apply to?
This manual covers the C257 generation CLS-Class exclusively. All trim levels are included — standard, AMG Line, and Sport package variants — across the full 2018–2022 production run.
Are wiring diagrams and electrical schematics included?
Yes. Full electrical documentation is provided, including CAN bus network layouts, MBUX infotainment wiring, LED Multibeam headlight schematics, driver assistance system circuits, ground point locations, and component connector pinouts for the entire vehicle.
What format is the manual?
The manual is a fully searchable PDF compatible with Windows, Mac, iOS, and Android devices. Individual pages or complete sections can be printed for shop use, and the file can be saved to multiple devices for convenient access.
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