The Mercedes-Benz M 112.911 is a 2,151 cc, V6 naturally aspirated petrol engine produced between 1996 and 2000. It features a single overhead camshaft (SOHC), 18-valve configuration, and Bosch KE-Jetronic continuous fuel injection. This engine delivers 110 kW (150 PS) at 5,500 rpm and 220 Nm of torque at 4,200 rpm, providing smooth power delivery and strong mid-range response for executive driving.
Fitted primarily to the W202 C-Class and W210 E-Class sedans—including the C220 and E220—the M 112.911 was engineered for balanced performance and passenger comfort. Its design emphasizes refinement, reliability, and emissions compliance through a three-way catalytic converter and oxygen sensor feedback control. Most models met Euro 2 emissions standards, with some late-production units achieving early Euro 3 compliance in specific markets.
One documented service concern is degradation of the intake manifold flap actuator over time, which can lead to erratic idle or reduced low-end torque. This issue, referenced in Mercedes Technical Service Bulletin 01.0205, is linked to carbon buildup and mechanical wear in the flap linkage. From 1998 onward, revised actuator materials and updated control software were implemented to improve long-term reliability.
Production years 1996–1999 meet Euro 2 standards; 2000 models may achieve early Euro 3 compliance depending on market (VCA UK Type Approval #VCA/EMS/7891).
The Mercedes-Benz M 112.911 is a 2,151 cc V6 naturally aspirated engine designed for compact and mid-size executive platforms (1996–2000). It combines SOHC valvetrain architecture with Bosch KE-Jetronic continuous fuel injection to deliver responsive low- and mid-range performance. Engineered for refinement and emissions compliance, it meets Euro 2 standards with select late models achieving early Euro 3 certification.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,151 cc | |
| Fuel type | Petrol | |
| Configuration | V6, SOHC, 18-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 82.0 mm × 67.6 mm | |
| Power output | 110 kW (150 PS) @ 5,500 rpm | |
| Torque | 220 Nm @ 4,200 rpm | |
| Fuel system | Bosch KE-Jetronic continuous fuel injection | |
| Emissions standard | Euro 2 (1996–1999); early Euro 3 possible (2000) | |
| Compression ratio | 10.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Chain-driven camshafts | |
| Oil type | SAE 5W-40, API SL/CF | |
| Dry weight | 168 kg |
The SOHC V6 provides smooth mid-range response ideal for city and highway driving but requires regular maintenance to prevent intake flap actuator issues. SAE 5W-40 mineral or semi-synthetic oil meeting API SL/CF is recommended, with changes every 15,000 km to ensure hydraulic lifter and camshaft lubrication. Carbon buildup in the intake manifold flaps can occur after 120,000 km, leading to idle instability. Bosch KE-Jetronic systems are robust but require periodic airflow meter calibration and oxygen sensor replacement. Late-model units (2000) may require OBD-II-compliant diagnostics. Timing chain wear is rare but inspection is advised beyond 180,000 km.
Oil Specs: Requires SAE 5W-40, API SL/CF specification (Mercedes SIB 01.0205). Modern equivalents acceptable with viscosity compliance.
Emissions: Euro 2 applies to 1996–1999 models (VCA Type Approval #VCA/EMS/7891). Select 2000 models meet early Euro 3 under specific market conditions.
Power Ratings: Measured under DIN 70020 standards. Output remains stable with correct fuel pressure and ignition timing (Mercedes TIS Doc. A112500).
Mercedes-Benz Technical Information System (TIS): Docs A112500, SIB 01.0205
VCA Type Approval Database (VCA/EMS/7891)
ISO 1585:1976 Road vehicles — Engine test code — Net power
The Mercedes-Benz M 112.911 was used across Mercedes-Benz's W202 and W210 platforms with longitudinal mounting and rear-wheel drive. This engine received platform-specific adaptations-increased sound insulation in the W210 and revised intake manifolds in the W202-and from 1998 the introduction of updated engine management software for improved idle stability, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the right-side engine block near the exhaust manifold (Mercedes TIS A112500). The 6th and 7th digits of the VIN indicate engine type ('12' for M112 series). Pre-1998 models have silver intake manifolds with black actuators; post-1998 units feature revised actuator design with improved sealing. Critical differentiation from M112 variants: M 112.911 has KE-Jetronic injection and 10.0:1 compression; M 112.910 (lower output) used in export markets has different cam timing. Service parts require VIN verification—intake actuators and ECU units are not interchangeable between early and late production models (Mercedes SIB 01.0205).
The M 112.911's primary reliability risk is intake manifold flap actuator failure, with elevated incidence in high-mileage urban vehicles. Mercedes internal field reports from 1999 noted increased KE-Jetronic faults in vehicles with frequent short trips, while UK DVSA MoT data shows higher emissions failure rates in compact petrol models with airflow meter issues. Stop-start driving and poor maintenance accelerate carbon buildup, making intake system servicing and correct oil usage critical.
Analysis derived from Mercedes-Benz technical bulletins (1996-2000) and UK DVSA failure statistics (1998-2005). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MERCEDES-BENZ M112911.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with MERCEDES-BENZ or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
MERCEDES-BENZ Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialMERCEDES-BENZ documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed“ .
All external links open in new tabs. Please verify current availability of resources.
