Description
Factory Mercedes CLS 300d Workshop Manual (2018–2020)
This factory-level workshop manual covers the third-generation Mercedes-Benz CLS 300d (C257 chassis) for model years 2018 through 2020, giving US-based technicians and owners complete service and repair documentation for this diesel sedan.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | N/A |
| Diesel | OM656 2.0L four-cylinder turbodiesel (245 hp / 500 Nm) |
| Transmissions | 9G-TRONIC 9-speed automatic (code 725.0) |
| Drive | RWD; 4MATIC AWD variants |
| Model Years | 2018–2020 |
| Badge Twins | N/A |
Common CLS 300d Repairs Covered
| System | Procedures |
|---|---|
| OM656 Timing Chain | Timing chain inspection, tensioner replacement, and stretch diagnosis |
| AdBlue / DEF System | SCR system service, DEF pump replacement, NOx sensor diagnosis and fault clearing |
| 9G-TRONIC Transmission | Fluid and filter service, valve body inspection, TCU adaptation reset |
| Air Suspension (AIRMATIC) | Compressor replacement, strut seal service, ride-height sensor calibration |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
What is the known timing chain issue on the OM656 diesel in the CLS 300d?
The OM656 engine used in the C257 CLS 300d can exhibit timing chain stretch, particularly at higher mileages. Symptoms include rattling on cold start and P0016/P0017 camshaft correlation fault codes. This manual provides the full inspection criteria, tensioner replacement procedure, and torque specifications needed to address the repair correctly.
Does this manual cover the C257 chassis platform and all trim levels?
Yes. The manual covers the third-generation CLS built on the MRA (Modular Rear Architecture) C257 platform for 2018–2020, including standard CLS 300d and AMG Line variants. Both right- and left-hand-drive configurations are documented.
Are wiring diagrams and ADAS system procedures included?
Complete electrical schematics are included, covering engine management, COMAND infotainment, LED lighting circuits, climate control modules, and advanced driver assistance systems such as Active Distance Assist DISTRONIC. Connector pinouts, wire color coding, and CAN bus network diagrams are all present.
What format is the manual?
The manual is delivered as a fully searchable PDF compatible with Windows, Mac, iOS, and Android devices. After purchase, download is immediate and re-downloads are available for the lifetime of your account.
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