Description
Factory Mercedes-Benz ML250 CDI 4Matic Workshop Manual (2012-2015)
This official factory-level service manual for the W166-platform ML250 CDI 4Matic gives US technicians and serious owners complete repair authority over one of Mercedes-Benz’s most capable diesel SUVs from model years 2012 through 2015.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Diesel | OM651 2.1L 4-cylinder twin-turbo CDI (BlueTEC) – ~204 hp / 369 lb-ft |
| Transmissions | 7G-TRONIC PLUS 7-speed automatic |
| Drive | 4Matic permanent all-wheel drive |
| Model Years | 2012, 2013, 2014, 2015 |
| Chassis Code | W166 |
| Badge Twins | N/A |
Common ML250 CDI Repairs Covered
| System | Procedures |
|---|---|
| OM651 Timing Chain | Timing chain tensioner inspection, balance shaft chain replacement – a known wear item on the OM651 engine |
| AdBlue / DEF System | BlueTEC urea injection pump diagnostics, NOx sensor replacement, SCR catalyst servicing |
| 7G-TRONIC PLUS Transmission | Fluid and filter service, valve body removal, torque converter replacement procedures |
| Air Suspension / AIRMATIC | Compressor replacement, strut seal repair, ride-height sensor calibration |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
Is the OM651 timing chain issue documented in this manual?
Yes. The OM651 2.1L CDI has a well-documented tendency for balance shaft and primary timing chain tensioner wear, particularly before updated parts were introduced. This manual includes complete timing chain removal, inspection, and replacement procedures with torque specifications and special-tool requirements so the job can be done correctly the first time.
Does this manual cover the W166 platform in general, or only the ML250 CDI?
Coverage is specific to the ML250 CDI 4Matic on the W166 chassis for 2012-2015. While the W166 also underpins the ML350, ML400, and ML63 AMG, engine-specific chapters – particularly fuel injection, turbocharger, and emissions – apply to the OM651 diesel variant only.
Are wiring diagrams and ABS/ESP schematics included?
Full electrical documentation is included: circuit diagrams for the engine control module, 4Matic transfer case electronics, ABS/ESP modules, climate control, lighting, and the infotainment system. Connector pinouts, fuse box layouts, and ground point locations are all present to support accurate fault diagnosis.
What format is the manual?
This manual is a PDF file delivered via instant download. It is fully searchable, printable, and compatible with Windows, Mac, iOS, and Android devices – no proprietary software required.
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