Description
Factory Mercedes-AMG CLS 53 4Matic+ Workshop Manual (2018–2022)
This is the official factory-level service manual for the Mercedes-AMG CLS 53 4Matic+, covering every C257 chassis produced between 2018 and 2022. US technicians and enthusiasts get full access to AMG-specific repair procedures, wiring schematics, and factory torque specifications in a single searchable PDF.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol / Mild-Hybrid | 3.0L M256 E30 turbocharged inline-6 with EQ Boost ISG (48V mild-hybrid) |
| Diesel | N/A |
| Transmissions | AMG Speedshift TCT 9G-Tronic 9-speed automatic |
| Drive | 4Matic+ fully variable AWD |
| Model Years | 2018, 2019, 2020, 2021, 2022 |
| Badge Twins | N/A |
Common CLS 53 Repairs Covered
| System | Procedures |
|---|---|
| EQ Boost / 48V ISG | Integrated starter-generator inspection, belt-starter system diagnosis, 48V battery service |
| M256 Engine Oil System | Oil separator and crankcase ventilation service — a known maintenance item on the M256 engine |
| 9G-Tronic Transmission | Fluid replacement, mechatronic unit removal, valve body inspection and torque specs |
| Air Suspension / Ride Height | ABC/air strut diagnostics, compressor replacement, ride-height sensor calibration |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
What is the known oil system issue on the M256 engine, and does the manual cover it?
The M256 3.0L inline-6 used in the CLS 53 is known for crankcase ventilation and oil separator concerns that can trigger fault codes and oil consumption complaints. This manual includes full lubrication system procedures, crankcase ventilation service steps, and the factory torque specs required to address those repairs correctly.
What chassis code does this manual cover, and are any related C-Class or E-Class variants included?
Coverage is specific to the C257 chassis — the dedicated CLS-Class platform. The closely related W213 E-Class and W205 C-Class are separate platforms and are not included in this manual.
Are the 48V EQ Boost electrical schematics included for diagnosing hybrid system faults?
Yes. The manual contains complete wiring diagrams for the 48-volt EQ Boost network, including ISG connector pinouts, high-voltage harness routing, belt-starter control module circuits, and diagnostic procedures for P-codes related to the mild-hybrid system.
What format is the manual?
This manual is delivered as a PDF file available for immediate download after purchase. It is fully searchable, zoomable on all diagrams, and compatible with any standard PDF reader on Windows, Mac, iOS, or Android devices. Individual pages or full sections can be printed for bench use.
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