Description
Factory Mercedes-Benz CLS350 Workshop Manual (2018–2020)
This factory-level workshop manual covers the third-generation Mercedes-Benz CLS350 (C257 platform) from 2018 through 2020, giving US technicians and owners the same technical depth used by authorized Mercedes-Benz service centers.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | M264 2.0L turbocharged inline-four with EQ Boost mild-hybrid (~299 hp); M256 3.0L turbocharged inline-six |
| Diesel | N/A (US market) |
| Transmissions | 9G-TRONIC 9-speed automatic |
| Drive | RWD; 4MATIC AWD (select variants) |
| Model Years | 2018, 2019, 2020 |
| Badge Twins | N/A |
Common CLS350 Repairs Covered
| System | Procedures |
|---|---|
| M264 Timing Chain | Timing chain tensioner inspection, chain replacement, camshaft phaser service — a known wear item on early M264 units |
| EQ Boost 48V System | Integrated starter-generator diagnostics, 48V battery health checks, belt-driven ISG belt replacement |
| 9G-TRONIC Transmission | Fluid and filter service, valve body removal, TCU adaptation reset procedures |
| AIRMATIC Suspension | Air strut replacement, compressor diagnostics, ride-height sensor calibration |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
Why does the M264 timing chain need attention on 2018–2020 CLS350 models?
Early production M264 2.0L engines fitted to the C257 CLS350 have exhibited timing chain tensioner wear at higher mileages, resulting in rattle on cold starts. The manual includes complete tensioner inspection criteria, torque specifications, and step-by-step chain replacement procedures to address this issue correctly.
Is the C257 CLS350 related to any other Mercedes-Benz platform models?
Yes. The C257 platform underpins not only the CLS350 but is closely related to the W213 E-Class architecture. Many powertrain, suspension, and electrical sub-systems are shared, so procedures in this manual will be broadly familiar to technicians who have worked on 2016–2020 E-Class vehicles.
Does the manual cover the 48V EQ Boost mild-hybrid electrical system?
Yes. Full documentation of the integrated starter-generator, 48V lithium-ion battery, and associated power electronics is included. Wiring schematics, connector pinouts, fault code diagnostics, and component replacement procedures for the EQ Boost system are all covered.
What format is the manual?
The manual is a fully searchable PDF compatible with Windows, macOS, iOS, and Android devices. After purchase you receive an instant download link, and your file is available for unlimited re-downloads at no additional charge.
Reviews
There are no reviews yet.