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X166 SUV

Mercedes-Benz GL / GLS · SUV · 2012–2019

Second-gen GL, renamed GLS.

Production run

2012–2019

Engines covered

3

Avg. part price

—

19902026

Interactive systems map

Inspect the X166

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

Cooling1

Intake2

Documented issues per engine

4

M278

4

M157

5

OM642

Known weak points

What breaks on the X166

Turbo oil linesDiagnose →Camshaft adjustersDiagnose →Oil cooler seal leak (classic)Diagnose →Swirl flap / intake runner failureDiagnose →

Guides & playbooks

X166 playbooks

Maintenance scheduleGive me a mileage-based maintenance schedule for a Mercedes-Benz GL / GLS X166, including the items the factory schedule skips.Buyer's inspectionI'm inspecting a used Mercedes-Benz GL / GLS X166. What exactly should I check, test drive and look for underneath?Build planPlan a staged performance build for a Mercedes-Benz GL / GLS X166 that stays reliable as a daily driver.Fault code lookupI have a fault code on my Mercedes-Benz GL / GLS X166. Walk me through what it means and how to confirm the cause.

Fits your X166

Parts & tools

Full catalog & export

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