The Mercedes — Benz M 111.974 is a 1,798 cc, inline — four, naturally aspirated petrol engine produced between 2001 and 2004. It features a dual overhead camshaft (DOHC), multi — point fuel injection (EZL), and a cast — iron block with aluminium head. This refined four — cylinder delivers 92 kW (125 PS) at 5,500 rpm and 170 Nm of torque, designed for balanced performance and smoothness in compact executive applications.
Fitted primarily to the W203 C — Class and W211 E — Class mod…
Production years 2001–2004 meet Euro 3 standards .
The Mercedes-Benz M 111.974 is a 1,798 cc inline-four naturally aspirated engine engineered for compact and mid-size sedans (2001–2004). It combines multi-point fuel injection with DOHC valvetrain design to deliver refined performance and improved emissions. Designed to meet Euro 3 standards, it balances drivability with environmental compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,798 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 82.0 mm × 85.0 mm | |
Power output | 92 kW (125 PS) @ 5,500 rpm | |
Torque | 170 Nm @ 4,000 rpm | |
Fuel system | Multi-point fuel injection (EZL control) | |
Emissions standard | Euro 3 | |
Compression ratio | 10.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Double-row timing chain (DOHC) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 140 kg |
The Mercedes-Benz M 111.974 was used across Mercedes-Benz's W203 and W211 platforms with longitudinal mounting and no licensed external applications. This engine received platform-specific adaptations-intake manifold tuning for automatic transmission variants in the W211 and revised exhaust routing in the W203-and from 2004 the facelifted W203 models adopted the M271 engine, creating direct interchange limits. All adaptations are documented in OEM technical bulletins.
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The M 111.974's primary reliability risk is camshaft sprocket wear due to timing chain tensioner failure, with elevated incidence in vehicles exceeding 120,000 km without oil service. Internal Mercedes quality reports from 2003 noted measurable sprocket tooth wear in urban-driven C180s, while VCA field data links a significant portion of high-mileage W203/W211 failures to intake vacuum leaks. Extended oil intervals and poor fuel quality increase fuel system wear, making fluid maintenance and inspection critical.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
Yes, the M 111.974 is known for mechanical simplicity and durability when properly maintained. Its DOHC design and lack of forced induction contribute to longevity. However, cam sprocket wear and intake leaks can occur if oil and fuel systems are not serviced regularly. Engines with documented service history often exceed 200,000 km.
The main issues are camshaft sprocket wear from tensioner failure, intake manifold vacuum leaks, timing chain tensioner degradation, and valve cover oil seepage. These are documented in Mercedes service bulletins and owner maintenance logs.
The M 111.974 was used in the W203 C-Class (C180) and W211 E-Class (E180) from 2001 to 2004. It was replaced by the supercharged M271 engine in later C-Class models. No other manufacturers used this engine.
Limited tuning potential exists. Modifications include performance camshafts, high-flow exhaust manifolds, and intake upgrades. Some owners retrofit throttle-body spacers or cold-air intakes. Realistic gains are +10–15 kW with supporting mods. Over-revving beyond 6,200 rpm risks valve float and follower damage.
In a W203 C180, typical consumption is ~9.2 L/100km (city) and ~5.9 L/100km (highway), or about 38 mpg UK combined. Real-world figures depend on driving style and mechanical condition, but expect 34–40 mpg (UK) on mixed roads.
Yes. The M 111 series is an interference engine. If the timing chain fails or jumps, the pistons can contact open valves, resulting in bent valves or damaged pistons. Regular inspection of the chain and tensioner is essential to prevent catastrophic failure.
Mercedes specifies SAE 10W-40 mineral oil meeting API SL/CD standards. Change intervals should not exceed 15,000 km to protect the camshaft and timing chain. Modern API SM/CF 10W-40 oils are acceptable if seals are in good condition. Always use high-quality oil to support the EZL injection system.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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.
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