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W140 Sedan · Coupe

Mercedes-Benz S-Class · Sedan · Coupe · 1991–1998

The most over-built S-Class ever made.

Production run

1991–1998

Engines covered

5

Avg. part price

—

19902026

Interactive systems map

Inspect the W140

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

Engine2

Cooling1

Fuel1

Electrical3

Exhaust1

Documented issues per engine

4

M104

4

M119

4

M120

4

OM603

4

OM606

Known weak points

What breaks on the W140

Wiring harness insulation crumbling (1992–1995)Diagnose →Head gasket at the rearDiagnose →Wiring harness degradationDiagnose →Timing chain tensioner railsDiagnose →Wiring harnessDiagnose →Coolant leaksDiagnose →Head cracking on 3.5Diagnose →Injection pump sealsDiagnose →Glow plugsDiagnose →

Guides & playbooks

W140 playbooks

Maintenance scheduleGive me a mileage-based maintenance schedule for a Mercedes-Benz S-Class W140, including the items the factory schedule skips.Buyer's inspectionI'm inspecting a used Mercedes-Benz S-Class W140. What exactly should I check, test drive and look for underneath?Build planPlan a staged performance build for a Mercedes-Benz S-Class W140 that stays reliable as a daily driver.Fault code lookupI have a fault code on my Mercedes-Benz S-Class W140. Walk me through what it means and how to confirm the cause.

Fits your W140

Parts & tools

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