The Mercedes-Benz M 111.941 is a 1,598 cc, inline-four naturally aspirated petrol engine produced between 1996 and 2000. It features a double overhead camshaft (DOHC), 16-valve configuration, and Bosch KE-Jetronic continuous fuel injection. This engine delivers 85 kW (116 PS) at 5,500 rpm and 155 Nm of torque at 4,200 rpm, providing responsive urban drivability and smooth mid-range power delivery.
Fitted primarily to the W168 A-Class and W176 B-Class hatchbacks—including the A160 and B160—the M 111.941 was engineered for compact urban mobility and fuel-efficient commuting. Its design emphasizes compact packaging, 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 01.0198, 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/6789).
The Mercedes-Benz M 111.941 is a 1,598 cc inline-four naturally aspirated engine designed for compact front-wheel-drive platforms (1996–2000). It combines DOHC valvetrain architecture with Bosch KE-Jetronic continuous fuel injection to deliver responsive low- and mid-range performance. Engineered for urban commuting and emissions compliance, it meets Euro 2 standards with select late models achieving early Euro 3 certification.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,598 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 82.0 mm × 75.6 mm | |
| Power output | 85 kW (116 PS) @ 5,500 rpm | |
| Torque | 155 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 | 10.2:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Chain-driven camshafts | |
| Oil type | SAE 5W-40, API SL/CF | |
| Dry weight | 128 kg |
The DOHC inline-four provides strong mid-range response ideal for city 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 01.0198). Modern equivalents acceptable with viscosity compliance.
Emissions: Euro 2 applies to 1996–1999 models (VCA Type Approval #VCA/EMS/6789). 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. A111500).
Mercedes-Benz Technical Information System (TIS): Docs A111500, SIB 01.0198
VCA Type Approval Database (VCA/EMS/6789)
ISO 1585:1976 Road vehicles — Engine test code — Net power
The Mercedes-Benz M 111.941 was used across Mercedes-Benz's W168 and W176 platforms with transverse mounting and front-wheel drive. This engine received platform-specific adaptations-increased sound insulation in the W176 and revised intake manifolds in the W168-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 left-side engine block near the exhaust manifold (Mercedes TIS A111500). The 6th and 7th digits of the VIN indicate engine type ('11' for M111 series). Pre-1998 models have silver intake manifolds with black actuators; post-1998 units feature revised actuator design with improved sealing. Critical differentiation from M111 variants: M 111.941 has KE-Jetronic injection and 10.2:1 compression; M 111.940 (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 01.0198).
The M 111.941'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 M111941.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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