The Mercedes — Benz OM 668.914 is a 1,950 cc, inline — four turbo — diesel engine produced between 2014 and 2020. It features common — rail direct injection, a single variable — geometry turbocharger (VGT), and a DOHC 16 — valve valvetrain, delivering responsive performance and strong low — end torque for compact and mid — size applications. In standard tune, it produced 100 kW (136 PS) at 3,800 rpm and 320 Nm of torque between 1,600–2,400 rpm.
Fitted to models such as the W176 A18…
Production years 2014–2020 meet Euro 6 standards .
The Mercedes-Benz OM 668.914 is a 1,950 cc inline-four turbo-diesel engineered for compact platforms (2014–2020). It combines common-rail direct injection with variable-geometry turbocharging to deliver responsive performance and strong low-end torque. Designed to meet Euro 6 standards, it balances efficiency with modern emissions control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,950 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged (variable geometry) | |
Bore × stroke | 83.0 mm × 90.0 mm | |
Power output | 100 kW (136 PS) @ 3,800 rpm | |
Torque | 320 Nm @ 1,600–2,400 rpm | |
Fuel system | Bosch CRS 3-18 common-rail (up to 1,800 bar) | |
Emissions standard | Euro 6 | |
Compression ratio | 15.8:1 | |
Cooling system | Water-cooled, electric thermostat | |
Turbocharger | Single variable-geometry turbocharger (Garrett) | |
Timing system | Dual-row timing chain (DOHC) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 165 kg |
The Mercedes-Benz OM 668.914 was used across Mercedes-Benz's W176/W117/X156 platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations-reinforced mounts in the X156 SUV and revised cooling routing in the W117 hatchback-and from 2017 the W176 received updated fuel filtration, creating interchange limits. 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.
The OM 668.914's primary reliability risk is high-pressure fuel pump wear under sustained load or poor fuel quality, with elevated incidence in long-distance and high-mileage applications. Daimler internal field reports from 2018 noted increased HPFP failures in W117 B180d units operating in regions with variable diesel quality, while VCA historical archives indicate fuel contamination as a leading cause of premature pump wear in preserved examples. Extended service intervals and use of non-compliant fuel increase mechanical stress, making adherence to fuel and service standards 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 OM 668.914 is generally reliable when properly maintained. Its compact inline-four turbo design allows many examples to exceed 300,000 km. Key risks include high-pressure fuel pump wear and DPF/SCR clogging. Regular oil changes, use of MB 229.51/52 oil, and adherence to service intervals are essential for long-term reliability.
The most common issues are high-pressure fuel pump failure due to poor fuel quality, EGR and intake carbon buildup, DPF clogging from short trips, and SCR/AdBlue system faults. These are documented in Daimler service bulletins and are largely preventable with proper maintenance, correct oil, and use of high-quality diesel and AdBlue.
The OM 668.914 was used in the W176 A180d (2014–2018), W117 B180d (2014–2018), X156 GLA180d (2014–2019), and C117 CLA180d (2015–2018). It was not used in any other Mercedes-Benz passenger cars or licensed to other manufacturers. All applications were transversely mounted with model-specific mounting and cooling configurations.
Aftermarket ECU tuning is common on the OM668914 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 real-world driving, the OM 668.914 achieves approximately 5.2–6.6 L/100km (54–43 mpg UK), depending on vehicle weight and driving style. The W176 A180d typically returns ~5.8 L/100km (49 mpg UK) on mixed routes. Its efficient combustion and turbo design contribute to strong economy for a modern 2.0L diesel.
Yes. The OM 668.914 is an interference engine. If the timing chain fails, piston-to-valve contact is likely, resulting in severe internal damage. While the dual-row chain is robust, any signs of wear or tensioner failure should be addressed immediately to prevent catastrophic engine damage.
The OM 668.914 requires MB 229.52 (SAE 0W-30) or MB 229.51 (SAE 5W-30) engine oil. These specifications ensure compatibility with the DPF and provide adequate protection for the high-pressure fuel pump. Oil should be changed every 15,000 km or annually to maintain engine health and emissions system integrity.
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.