The Mercedes — Benz M271.942 is a 1,796 cc, inline — four petrol engine produced between 2008 and 2015. It features turbocharging, direct fuel injection (CGI), and variable valve timing (CAMTRONIC), delivering strong low — end torque and improved fuel efficiency. This engine was part of Mercedes' compact engine family, designed for transverse installation in front — wheel — drive platforms, offering a balance of performance and refinement.
Fitted to models such as the W…
All production years (2008–2015) meet Euro 5 emissions standards .
The Mercedes-Benz M271.942 is a 1,796 cc inline-four turbo petrol engine engineered for compact front-wheel-drive models (2008–2015). It combines turbocharging with CGI direct injection to deliver strong low-RPM torque and linear power delivery. Designed to meet Euro 5 standards, it balances performance with emissions efficiency and packaging constraints.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,796 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve with CAMTRONIC | |
Aspiration | Turbocharged | |
Bore × stroke | 82.0 mm × 85.0 mm | |
Power output | 115–135 kW (156–184 PS) | |
Torque | 230–270 Nm @ 1,800–4,000 rpm | |
Fuel system | CGI direct injection (up to 140 bar) | |
Emissions standard | Euro 5 | |
Compression ratio | 9.3:1 | |
Cooling system | Water-cooled, electric coolant pump | |
Turbocharger | Single turbo (BorgWarner) | |
Timing system | Dual chain (lower and upper), non-interference design | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 128 kg |
The Mercedes-Benz M271.942 was used across Mercedes-Benz's W169/W245/CL203 platforms with transverse mounting and shared with Chrysler under platform partnership agreements. This engine received platform-specific adaptations-shorter intake manifolds in the A-Class and revised cooling in the B-Class-and from 2012 the facelifted A-Class W169 LCI adopted the M271DE18 with updated HPFP hardware, creating interchange limits. Partnerships allowed Chrysler's 2.0L turbo units to share CGI injection technology. All adaptations are documented in OEM technical bulletins.
Engine Finders UK Ltd, which operates EngineCode.uk, can pass your enquiry to engine suppliers in the UK. The service is for vehicles in the United Kingdom, with UK delivery or fitting. This is a commercially connected service, and sending an enquiry does not confirm diagnosis or compatibility.
Diagnostic reminder: If a technician has recommended replacing the engine, you can send an enquiry to engine suppliers in the UK. Confirm the diagnosis first: an engine-code record does not diagnose a fault.
Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
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
The M271.942 offers strong performance and efficiency, but early models (2008-2011) had HPFP reliability concerns. Later revisions (post-2012) improved pump durability, so well-maintained examples can exceed 180,000 km. Regular servicing with MB 229.51 oil and adherence to 15,000 km intervals greatly enhance longevity.
Key issues include high-pressure fuel pump failure, intake valve carbon buildup, turbo actuator faults, and electric coolant pump failures. These are documented in Mercedes-Benz service bulletins, particularly SIB 203070/13 for HPFP concerns. Carbon cleaning and timely oil changes are essential preventative measures.
This 1.8L turbo petrol was used in the A-Class (W169), B-Class (W245), and C-Class SportCoupe (CL203) from 2008-2015. It powered variants including A180, A200, A250, B180, B200, C200, and C250. Chrysler also used CGI injection technology derived from this engine in the 300C (2011-2014).
Aftermarket ECU tuning is common on the M271942 platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
In an A250 (135 kW) from 2013, combined consumption is ~7.5 L/100 km (~38 mpg UK). Highway driving can achieve ~6.2 L/100 km (~45 mpg UK). Real-world figures vary, but expect 35-45 mpg UK on mixed roads. Performance variants (A250) consume more under spirited driving.
No. The M271.942 uses a non-interference valvetrain design. If the timing chain fails, piston-to-valve contact is unlikely, reducing risk of catastrophic engine damage. However, timing chain replacement is still recommended per service schedule to prevent drivability issues.
Mercedes specifies MB 229.51 (5W-30) synthetic oil. This low-SAPS formulation is essential for turbo and direct injection system protection. Change oil every 15,000 km or annually to prevent HPFP wear and carbon buildup.
Comprehensive technical documentation and regulatory references
EngineCode.uk is operated by Engine Finders UK Ltd. It provides engine-reference information and an optional commercial enquiry service. It is not an official manufacturer website. Check the record's sources and confirm vehicle-specific details before relying on it for parts, repairs or replacement.
Our editorial standard prioritises relevant manufacturer documentation and official regulatory sources. The sources and verification status for a record should be checked alongside the data.
A statement is not verified merely because a source is listed. Where supporting evidence is missing or conflicting, the record should identify that limitation. Please report unsupported or inconsistent information.
Transparency in gaps
A missing or unverified value does not mean the manufacturer has withheld it. We distinguish information not yet verified, information not available to us, and information explicitly not disclosed by the source.
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.
Records are subject to review and correction. Source links, dates and verification notes should be read with the technical information. Our Editorial and Sourcing Policy explains our standards and review process.
Found an error or missing source? Report a problem with this page. Include the field or statement concerned and a supporting source if available. You can also email corrections@enginecode.uk.
Copyright and permissions
Images and other material may be protected by copyright. Attribution does not by itself grant permission to reuse material. If you believe material on this site infringes your rights, contact copyrights@enginecode.uk with the page URL and details of your claim. We will review the material and take appropriate action.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
Our Privacy Policy explains how Engine Finders UK Ltd uses information from visits, vehicle lookups, enquiries and messages. Our Cookie Policy explains cookies and similar technologies and how to change your choices.
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.
Ownership and commercial services
EngineCode.uk is owned and operated by Engine Finders UK Ltd. Alongside our reference content, we offer an optional replacement-engine enquiry service through Engine Finders and may identify relevant services provided by businesses connected with us. These commercial connections are disclosed. Using an enquiry service is not required to read our reference content.
Engine Finders UK Ltd operates this website. Our optional enquiry service has a commercial purpose. Our Ownership and Commercial Disclosure explains the relationship between the reference website and that service. Participating suppliers pay a fee or subscription to participate on the network and receive quote requests.
Use this record as a starting point for identification. Specifications and vehicle applications may contain errors or omissions. Confirm the exact engine variant and compatibility using vehicle-specific documentation and a qualified supplier or technician.
All external links open in new tabs. Please verify current availability of resources.