Description
Factory Mercedes CLS 350d 4Matic Workshop Manual (2018-2020)
This factory-level service manual for the Mercedes-Benz CLS 350d 4Matic (C257) covers every repair and maintenance procedure your technician needs, from routine service intervals to complete powertrain overhauls — all written to Mercedes main dealer standards.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Diesel | OM656 3.0L inline-6 turbodiesel (~286 hp / 600 Nm) |
| Transmissions | 9G-TRONIC 9-speed automatic |
| Drive | 4Matic AWD |
| Model Years | 2018, 2019, 2020 |
| Chassis Code | C257 (3rd generation CLS-Class) |
| Badge Twins | N/A |
Common CLS 350d Repairs Covered
| System | Procedures |
|---|---|
| OM656 Diesel Engine | Turbocharger inspection and replacement, fuel injector removal and coding, EGR valve service |
| 9G-TRONIC Transmission | Fluid and filter service, TCU adaptation reset, valve body diagnostics |
| 4Matic AWD System | Transfer case fluid change, front differential service, driveshaft removal |
| Electrical & ADAS | Wiring diagrams, COMAND/infotainment diagnostics, airbag system service, radar sensor calibration |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
What is the known issue with the OM656 diesel engine in the CLS 350d?
The OM656 inline-six diesel in the C257 CLS 350d can develop swirl flap actuator wear and EGR valve carbon buildup over time, which may trigger fault codes and reduce performance. This manual includes the full removal, cleaning, and replacement procedures for both components, along with torque specifications and software adaptation steps required after installation.
Does this manual cover both the standard and AMG Line trim levels?
Yes. All C257 CLS 350d 4Matic variants produced from 2018 through 2020 are covered, including the base trim and AMG Line models. Suspension geometry data, sport braking specifications, and cosmetic panel fitment instructions applicable to AMG Line-specific components are all included.
Are complete wiring diagrams and electrical schematics included?
Yes. The manual contains full electrical circuit diagrams covering the engine management system, 9G-TRONIC transmission controls, 4Matic AWD electronics, COMAND navigation, climate control, airbag/SRS systems, and advanced driver assistance features, complete with connector pinouts, wire color codes, and component locations.
What format is the manual?
The manual is delivered as a fully searchable PDF document. It is compatible with any PDF reader on Windows, Mac, or mobile devices and can be downloaded immediately after purchase with unlimited future re-downloads included.
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