Engines Market

Mercedes V250d / V300d Specialists

Mercedes Benz V Class V250d / V300d Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK Mercedes Benz V Class V250d and V300d engine specialists. Compare prices on reconditioned, rebuilt and used OM651 and OM654 diesel engines - supply & fit available nationwide for W447 generation V Class models.

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12-Month Warranty
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Mercedes Benz V Class V250d / V300d Engine
from£3,100 to £5,900
  • Usedfrom £1,800
  • Reconditionedfrom £2,800
  • Common codesOM651.921, OM651.941, OM654.910
Mercedes Benz v-class V250d / V300d Used Engine — OM651.921Mercedes Benz v-classUsed Engine — OM651.921Mercedes Benz v-class V250d / V300d Reconditioned Engine — OM651.921Mercedes Benz v-classReconditioned Engine — OM651.921Mercedes Benz v-class V250d / V300d Rebuilt Engine — OM651.921Mercedes Benz v-classRebuilt Engine — OM651.921

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3 Simple Steps to Finding the Right Replacement Engine

Clear information first, then the right engine and specialist for your exact vehicle.

Variant History

Mercedes V Class V250d / V300d Engine History & Specs at a Glance

The Mercedes Benz V Class V250d and V300d represent the high-output diesel options in the W447 generation V Class range. Early models (2014-2019) were powered by the OM651 2.1-litre twin-turbo diesel, while facelift models (2019-present) received the modern OM654 2.0-litre diesel - delivering 190-240hp and exceptional torque for executive transport, airport transfers and luxury family travel.

Mercedes V Class V250d / V300d
  1. 2014

    W447 V Class launched with OM651.921 (V250d, 204hp) and OM651.941 (V300d, 240hp), 7G-TRONIC automatic transmission

  2. 2017

    Facelift introduces updated emissions calibration

  3. 2019

    OM654.910 (V250d, 190hp) and OM654.920 (V300d, 237hp) replace OM651 in facelift models

  4. 2023

    OM654.920 refined for Euro 6d emissions compliance

Every high-output diesel engine fitted to the Mercedes V Class V250d and V300d is covered below, with UK rebuilt pricing and known failure points from real owner experience.

Engine Codes & Pricing

Mercedes V Class V250d / V300d Engine Codes Specifications & Replacement Cost

Find your exact engine code, specs and UK replacement cost guide.

OM651.921 — 2.1L Diesel (2014-2019) engine

OM651.921 — 2.1L Diesel (2014-2019)

Power Output
204 hp (150 kW) @ 4,200 rpm
Torque
500 Nm
Displacement
2,143cc
Configuration
Inline-4, DOHC, common-rail direct injection, twin-turbo
Years Fitted
2014-2019

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Common Problems

Mercedes V Class V250d / V300d Engine Problems Repair Cost vs Replacement

The Mercedes V Class V250d and V300d are powered by two of Mercedes' most capable diesel engines - the OM651 2.1-litre twin-turbo and the OM654 2.0-litre modular diesel. While both offer impressive performance and refinement, they have developed well-documented reputations for specific failures. Timing chain tensioner wear dominates OM651 replacement demand, while OM654 EGR cooler crystallisation and high-pressure fuel pump issues drive repair enquiries on facelift models. Every rebuilt engine supplied through EnginesMarket includes upgraded components designed to address the original failure point - plus a minimum 12-month unlimited mileage warranty. Below we break down the most common V250d and V300d engine failures, what they cost to fix, and when replacement is the smarter financial decision.

Common failure points and repair options

OM651 Timing Chain Tensioner Failure

Affected
Mercedes V Class V250d (OM651.921) and V300d (OM651.941), 2014-2019
Typical failure mileage
60,000 - 90,000 miles
Root cause
The OM651's single most critical failure point is the timing chain system. A faulty tensioner allows oil pressure loss, causing chain slack and a characteristic rattle on cold start. The chain stretches and guides wear over time. If ignored, the chain can jump teeth, leading to catastrophic valve and piston interference. The chain tensioner has been revised multiple times, primarily affecting older OM651 engines.

Repair options

Repair tierDealer priceSpecialist price
Minor - Tensioner Replacement£800-£1,200£400-£700
Major - Full Chain & Tensioner Kit£1,900-£2,800£1,200-£1,800
Full Replacement - Rebuilt OM651 Engine£8,500-£10,000£3,500-£5,200
Our recommendation
If you are hearing a metallic rattle at cold start on a V250d or V300d under 90,000 miles, a preventative timing chain replacement is the most cost-effective route. However, if the chain has already jumped timing or damaged the cylinder head, a full rebuilt OM651 engine is the only financially sensible option to avoid repeated downtime and costly collateral repairs.
-> Compare rebuilt OM651 engine prices for your Mercedes V250d / V300d

OM654 EGR Cooler Crystallisation

Affected
Mercedes V Class V250d (OM654.910) and V300d (OM654.920), 2019-2024
Typical failure mileage
40,000 - 70,000 miles
Root cause
The OM654's EGR cooler can suffer from crystallisation and carbon buildup, particularly on vehicles used for short journeys. This leads to reduced performance, rough idle, increased fuel consumption, and emissions warning lights. Coolant loss without a visible external leak may indicate a cracked or internally leaking EGR cooler.

Repair options

Repair tierDealer priceSpecialist price
Minor - EGR Cooler Cleaning£500-£800£250-£450
Intermediate - EGR Cooler & Valve Replacement£1,400-£1,900£950-£1,350
Full Replacement - Reconditioned OM654 Engine£8,500-£10,000£3,500-£5,500
Our recommendation
On a facelift V250d or V300d used primarily for airport transfers or motorway cruising, EGR systems clog less frequently. However, if your vehicle operates in heavy city traffic, an EGR cooler replacement is a practical mid-term fix. If the crack has allowed coolant into the combustion chamber, a full rebuilt engine is strongly advised to prevent catastrophic cylinder scoring.
-> Compare OM654 EGR repair costs for your V250d / V300d

OM651 / OM654 High-Pressure Fuel Pump & Injector Issues

Affected
Mercedes V Class V250d (OM651.921, OM654.910) and V300d (OM651.941, OM654.920), 2014-2024
Typical failure mileage
80,000 - 120,000 miles
Root cause
High-pressure fuel pump (HPFP) wear and injector seal degradation are documented issues across both OM651 and OM654 families. Fuel system failures can cause hard starting, rough idle, and in severe cases, complete engine failure if metal debris contaminates the fuel system.

Repair options

Repair tierDealer priceSpecialist price
Minor - Injector Seal Replacement£400-£700£250-£450
Intermediate - HPFP Replacement£1,200-£1,800£700-£1,200
Full Replacement - Reconditioned Engine£8,500-£10,000£3,500-£5,500
Our recommendation
We recommend a full reconditioned engine if fuel dilution of the oil is detected or if metal debris has contaminated the fuel system. Partial fixes on a compromised fuel system rarely survive commercial delivery cycles, making a complete rebuilt unit the most cost-effective long-term investment for fleet operators.
-> Compare rebuilt OM651 / OM654 Mercedes V Class V250d / V300d engine prices

Don't Let Engine Failure Write Off Your Mercedes V Class V250d or V300d

A failed high-output diesel engine doesn't have to mean the end of your V Class. Whether you're dealing with OM651 timing chain tensioner failure, OM654 EGR cooler crystallisation, or fuel system issues, EnginesMarket makes it simple to compare prices from trusted UK Mercedes V Class specialists. Every rebuilt engine in our network includes upgraded components designed to address the original failure point, a minimum 12-month unlimited mileage warranty, and nationwide delivery with supply & fit options available.

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FAQ

Mercedes V Class V250d / V300d Engine ReplacementFrequently Asked Questions

Everything Mercedes Benz V Class V250d / V300d owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

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Comparing quotes for your Mercedes V Class V250d or V300d engine replacement is completely free and carries no obligation - enter your registration above, receive tailored prices from UK specialists who know the OM651 and OM654 high-output diesel engines inside out, and get back on the road with confidence. Every rebuilt engine is backed by a minimum 12-month unlimited mileage warranty.

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