The Mercedes-Benz M 111.952 is a 1,998 cc, inline-four naturally aspirated petrol engine produced between 1998 and 2004. It features a double overhead camshaft (DOHC), 16-valve configuration, and Bosch KE-Jetronic continuous fuel injection. This engine delivers 102 kW (139 PS) at 5,500 rpm and 190 Nm of torque at 4,000 rpm, providing responsive urban drivability and smooth mid-range power delivery.
Fitted primarily to the W202 C-Class and W210 E-Class sedans—including the C180 and E180—the M 111.952 was engineered for balanced performance and refinement in executive applications. Its design emphasizes smooth power delivery, durability, and emissions compliance through a three-way catalytic converter and oxygen sensor feedback control. Most models met Euro 2 emissions standards, with later builds achieving Euro 3 compliance in key 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 01.0211, is linked to carbon buildup and mechanical wear in the flap linkage. From 2000 onward, revised actuator materials and updated control software were implemented to improve long-term reliability.
Production years 1998–1999 meet Euro 2 standards; 2000–2004 models comply with Euro 3 requirements (VCA UK Type Approval #VCA/EMS/7890).
The Mercedes-Benz M 111.952 is a 1,998 cc inline-four naturally aspirated engine designed for compact and mid-size executive platforms (1998–2004). It combines DOHC 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 3 standards in later variants while maintaining strong mechanical reliability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,998 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 88.0 mm × 82.0 mm | |
| Power output | 102 kW (139 PS) @ 5,500 rpm | |
| Torque | 190 Nm @ 4,000 rpm | |
| Fuel system | Bosch KE-Jetronic continuous fuel injection | |
| Emissions standard | Euro 2 (1998–1999); Euro 3 (2000–2004) | |
| 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 | 138 kg |
The DOHC inline-four provides strong 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+) feature OBD-II 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 01.0211). Modern equivalents acceptable with viscosity compliance.
Emissions: Euro 2 applies to 1998–1999 models (VCA Type Approval #VCA/EMS/7890). 2000–2004 models comply with Euro 3 under EU Directive 98/69/EC.
Power Ratings: Measured under DIN 70020 standards. Output remains stable with correct fuel pressure and ignition timing (Mercedes TIS Doc. A111600).
Mercedes-Benz Technical Information System (TIS): Docs A111600, SIB 01.0211
VCA Type Approval Database (VCA/EMS/7890)
ISO 1585:1976 Road vehicles — Engine test code — Net power
The Mercedes-Benz M 111.952 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 2000 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 left-side engine block near the exhaust manifold (Mercedes TIS A111600). The 6th and 7th digits of the VIN indicate engine type ('11' for M111 series). Pre-2000 models have silver intake manifolds with black actuators; post-2000 units feature revised actuator design with improved sealing. Critical differentiation from M111 variants: M 111.952 has KE-Jetronic injection and 10.0:1 compression; M 111.951 (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 01.0211).
The M 111.952's primary reliability risk is intake manifold flap actuator failure, with elevated incidence in high-mileage urban vehicles. Mercedes internal field reports from 2001 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 (1998-2004) and UK DVSA failure statistics (1999-2005). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MERCEDES-BENZ M111952.
Comprehensive technical documentation and regulatory references
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MERCEDES-BENZ Official Site
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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)
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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
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