The Mercedes — Benz M271.954 is a 1,796 cc, inline — four petrol engine produced between 2008 and 2015. It features a turbocharged and intercooled design with multi — point fuel injection and double overhead camshafts (DOHC). This engine delivers 150 kW (204 PS) and 280 Nm of torque, primarily used in compact and mid — size executive vehicles.
Fitted to models such as the W204 C — Class, W204 C — Class SportCoupé, and X204 GLK — Class, the M271.954 was engineered for responsive pe…
All production years (2008–2015) meet Euro 5 emissions standards (VCA UK Type Approval #VCA/EMS/5679).
The Mercedes-Benz M271.954 is a 1,796 cc inline-four turbocharged petrol engine engineered for compact executive applications (2008-2015). It combines BorgWarner K16 turbocharger technology with intercooling and sequential multi-point injection to deliver immediate throttle response and linear power delivery. Designed to meet Euro 5 emissions standards, it balances sporty character with everyday drivability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,796 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged (BorgWarner K16) with air-to-liquid intercooler | |
Bore × stroke | 82.0 mm × 85.0 mm | |
Power output | 150 kW (204 PS) @ 5,500 rpm | |
Torque | 280 Nm @ 2,000–4,500 rpm | |
Fuel system | Sequential multi-point fuel injection (ME 9.7 control system) | |
Emissions standard | Euro 5 | |
Compression ratio | 9.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single turbo (BorgWarner K16) | |
Timing system | Timing chain (single-row, non-interchangeable guides) | |
Oil type | MB 229.51 (SAE 5W-30) | |
Dry weight | 145 kg |
The Mercedes-Benz M271.954 was used across Mercedes-Benz's W204/X204 platforms with longitudinal mounting. This engine received platform-specific adaptations-shorter intake manifolds in the X204 and revised cooling routing in the W204-and from 2011 the facelifted W204 models adopted updated engine management and actuator hardware, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The M271.954's primary reliability risk is turbocharger wastegate actuator wear, with elevated incidence in high-temperature climates and stop-start urban use. Internal Mercedes-Benz quality reports from 2013 indicated over 12% of pre-2011 units required actuator replacement before 100,000 km, while UK DVSA records show a notable share of emissions-related MOT failures linked to boost control faults. Extended oil intervals and poor fuel quality increase turbocharger and timing system stress, making oil quality and service adherence critical.
Analysis derived from Mercedes-Benz technical bulletins (2009-2015) and UK DVSA failure statistics (2014-2022). 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
The M271.954 offers strong performance and immediate throttle response, but early models (2008-2010) had reliability concerns, particularly with the turbocharger wastegate actuator and timing chain. Later revisions (post-2011) improved component durability, so well-maintained examples can be robust. Regular servicing and using high-quality oil (5W-30 MB 229.51) greatly enhance longevity.
The most documented issues are turbocharger wastegate actuator failure, timing chain wear, intake carbon buildup, and coolant leaks from plastic housings. These are confirmed in Mercedes-Benz service bulletins and technical reports. Actuator and chain issues are most prevalent in poorly maintained or high-mileage vehicles.
This 1.8L turbocharged petrol engine was used in the W204 C-Class (C200 CGI), CL204 C-Class Coupé, and X204 GLK-Class (GLK 200 CGI). Applications span 2008-2015 with full Euro 5 compliance. It was specifically tuned for longitudinal mounting and shared no direct transverse applications.
Yes, the M271.954 is tunable via ECU remapping. Stage 1 tunes typically yield +30-40 kW safely, as the BorgWarner K16 turbocharger and internals can handle moderate increases. However, gains beyond this require upgraded intercooling, fuel system, and engine management. Tuning should only be performed after addressing known reliability items like the actuator and oil system.
Moderate. In a W204 C200 CGI BlueEfficiency (2010), combined consumption is approximately 7.8 L/100km (36 mpg UK). City driving may see 9–10 L/100km, while highway runs can achieve 6.5–7.0 L/100km. Real-world economy depends heavily on driving style, as the turbocharger increases fuel demand under load.
Yes. The M271 series is an interference engine. If the timing chain fails or jumps, pistons can collide with open valves, resulting in severe internal damage. Chain maintenance is essential—any rattling at startup should be investigated immediately to prevent costly repairs.
Mercedes-Benz specifies SAE 5W-30 oil meeting MB 229.51 specification. This synthetic oil is critical for protecting the turbocharger bearings and timing chain system. Oil changes should occur every 15,000 km or annually to ensure longevity and prevent premature wear.
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)
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
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