← All platforms

C257 4-door Coupe

Mercedes-Benz CLS · 4-door Coupe · 2018–2023

Inline-six and 48V hybrid CLS.

Production run

2018–2023

Engines covered

3

Avg. part price

—

19902026

Interactive systems map

Inspect the C257

Tap a hotspot to inspect that system

Systems map

Where it goes wrong

Each numbered hotspot counts the documented failure points in that area. Select one to see the specifics for this chassis and engine.

Failure points by system

Engine1

Cooling3

Fuel2

Electrical1

Exhaust2

Documented issues per engine

4

M256

4

M264

4

OM656

Known weak points

What breaks on the C257

48V system faultsDiagnose →Water pump / thermostatDiagnose →Water pumpDiagnose →Timing chain tensioner on early unitsDiagnose →AdBlue faultsDiagnose →EGR coolerDiagnose →

Guides & playbooks

C257 playbooks

Maintenance scheduleGive me a mileage-based maintenance schedule for a Mercedes-Benz CLS C257, including the items the factory schedule skips.Buyer's inspectionI'm inspecting a used Mercedes-Benz CLS C257. What exactly should I check, test drive and look for underneath?Build planPlan a staged performance build for a Mercedes-Benz CLS C257 that stays reliable as a daily driver.Fault code lookupI have a fault code on my Mercedes-Benz CLS C257. Walk me through what it means and how to confirm the cause.

Fits your C257

Parts & tools

Full catalog & export

Loading catalog…