Description
Factory Mercedes CLS 260 Workshop Manual (2020–2022)
This factory-level service manual covers the third-generation Mercedes-Benz CLS 260 (C257 chassis) sold between 2020 and 2022, giving US technicians and enthusiasts the complete repair documentation needed to service this turbocharged four-door coupe to dealer standards.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | M264 2.0L turbocharged inline-4 (~197 hp / 320 Nm) |
| Diesel | N/A |
| Transmissions | 9G-TRONIC 9-speed automatic |
| Drive | RWD |
| Model Years | 2020, 2021, 2022 |
| Badge Twins | N/A |
Common CLS 260 Repairs Covered
| System | Procedures |
|---|---|
| M264 Timing Chain | Timing chain tensioner inspection, chain stretch diagnosis, and replacement procedure |
| 9G-TRONIC Transmission | Fluid and filter service, valve body removal, conductor plate replacement |
| MBUX Infotainment / CAN Bus | CAN bus fault diagnosis, control unit coding, wiring harness connector testing |
| Turbocharger & Fuel System | High-pressure fuel injector removal, turbo boost leak testing, wastegate actuator calibration |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
Is the M264 timing chain a known issue on the CLS 260?
Yes. The M264 2.0L turbo engine used in the CLS 260 shares the same timing chain tensioner design found across multiple Mercedes-Benz four-cylinder applications. Premature chain wear and tensioner rattle on cold starts have been reported. This manual includes the full timing chain inspection intervals, tensioner replacement torque specs, and step-by-step chain replacement procedure to address this correctly.
Does the C257 CLS 260 share a platform with any other Mercedes model?
Yes. The C257 platform underpins the entire third-generation CLS-Class lineup, which also includes the CLS 300, CLS 350, CLS 450, and CLS 53 AMG variants. This manual is specific to the CLS 260 engine and transmission combination but covers the shared chassis, suspension, and body electrical systems common across the C257 family.
Does the manual include wiring diagrams and ADAS system coverage?
Yes. Full electrical documentation is included, covering color-coded wiring diagrams for all circuits, MBUX system schematics, LED lighting circuits, ground point locations, and connector pin-out charts. Advanced driver assistance systems such as Active Brake Assist, lane-keeping assist, and parking sensors are also documented with diagnostic and calibration procedures.
What format is the manual?
This manual is a PDF file delivered via instant download upon purchase. It is fully searchable and compatible with Windows, macOS, iOS, and Android devices. Individual pages or complete chapters can be printed for shop use, and no internet connection is required after download.
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