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Mercedes Viano 2.2 CDI Specialists

Mercedes Benz Viano 2.2 CDI Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK Mercedes Benz Viano 2.2 CDI engine specialists. Compare prices on reconditioned, rebuilt and used engines - supply & fit available nationwide for all W638 and W639 2.2 CDI variants.

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Mercedes Benz Viano 2.2 CDI Engine
from£1,200 to £3,000
  • Usedfrom £500
  • Reconditionedfrom £1,400
  • Common codesOM611, OM646, OM651
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How it works

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 Benz Viano 2.2 CDI Engine History & Specs at a Glance

The Mercedes Benz Viano 2.2 CDI powered the vast majority of UK Viano sales across two generations - the W638 (1996-2003) with the OM611 engine, and the W639 (2003-2014) with the OM646 and later OM651 engines. This 2.2-litre common-rail diesel family defined the Viano's reputation as a robust, economical people carrier, though each generation brought distinct reliability challenges.

Mercedes Benz Viano 2.2 CDI
  1. 1996

    W638 Viano launched with OM611 2.2L common-rail diesel, 90-125hp, Bosch injection system

  2. 2003

    W639 Viano launched with OM646 2.2L diesel (modified OM611), 109-150hp, Euro III emissions

  3. 2006

    OM646 gains Euro IV emissions compliance with EGR cooler and DPF

  4. 2010

    W639 facelift introduces OM651 2.2L diesel with 136-163hp, twin-turbo on higher-output variants

  5. 2014

    Viano production ends, replaced by Mercedes V-Class

Every 2.2 CDI engine fitted to the Mercedes Benz Viano is covered below, with UK rebuilt pricing and known failure points from real owner experience.

Engine Codes & Pricing

Mercedes Benz Viano 2.2 CDI Engine Codes Specifications & Replacement Cost

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

OM611 — 2.2L Diesel (1996-2003) engine

OM611 — 2.2L Diesel (1996-2003)

Power Output
90-125 hp (60-95 kW)
Displacement
2,151cc (early) / 2,148cc (later)
Configuration
Inline-4, DOHC, common-rail direct injection, variable turbine geometry turbocharger
Years Fitted
1996-2003

Can’t find your exact engine code?-> Get quotes for OM611 Mercedes Benz Viano 2.2 CDI engine replacement

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Common Problems

Mercedes Benz Viano 2.2 CDI Engine Problems Repair Cost vs Replacement

The Mercedes Viano 2.2 CDI - whether OM611, OM646 or OM651 - is the backbone of UK Viano diesel ownership. Each engine family has distinct, well-documented failure patterns. The OM646 timing chain tensioner dominates replacement demand, while OM611 injector pump seal failure and OM651 chain stretch also drive significant repair enquiries. 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 Viano 2.2 CDI engine failures, what they cost to fix, and when replacement is the smarter financial decision.

Common failure points and repair options

OM646 Timing Chain Tensioner Failure

Affected
Mercedes Viano 109 CDI, 111 CDI, 115 CDI, 2.2 CDI (2003-2010, OM646.960, OM646.963, OM646.982)
Typical failure mileage
80,000 - 140,000 miles
Root cause
The original OM646 timing chain tensioner (OEM A6460500307) fails to maintain adequate oil pressure, allowing the single-row timing chain to slacken. This produces a characteristic rattle on cold start and, if ignored, can lead to timing correlation faults and chain skip - with catastrophic piston-valve contact.

Repair options

Repair tierDealer priceSpecialist price
Preventative - Timing Chain Kit Replacement£1,200-£1,800£768-£1,280
Full Replacement - Rebuilt OM646 Engine£3,000-£4,500£1,800-£2,800
Our recommendation
If you hear chain rattle on cold start or have camshaft correlation fault codes (P0016/P0017), act immediately. Preventative chain replacement at a specialist (£768-£1,280) is far cheaper than a full engine replacement. On a Viano worth £3,000-£6,000, once the chain has slipped and damaged valves, replacement is usually the correct financial decision.
-> Compare rebuilt OM646 engine prices for your Mercedes Viano 2.2 CDI

OM611 Injector Pump Seal Failure

Affected
Mercedes Viano 2.2 CDI (W638 generation, 1996-2003, OM611)
Typical failure mileage
90,000 - 160,000 miles
Root cause
The injector pump seal fails internally, allowing diesel fuel to leak into the engine oil sump. The rising oil level and thinned, fuel-diluted oil causes rapid bearing wear, low oil pressure, and eventual catastrophic engine failure.

Repair options

Repair tierDealer priceSpecialist price
Injector Pump Seal Replacement£600-£1,000£350-£600
Full Replacement - Rebuilt OM611 Engine£2,500-£3,500£1,400-£2,200
Our recommendation
Check your dipstick regularly - if the oil level rises between services or smells strongly of diesel, stop driving immediately. Early detection means a £350-£600 specialist repair. Ignoring it will destroy the bottom end and require a full replacement engine. On an older W638 Viano, replacement often exceeds the vehicle's value.
-> Get quotes for OM611 Mercedes Viano 2.2 CDI replacement engines

OM651 Timing Chain Stretch & Fuel Pump Failure

Affected
Mercedes Viano 113 CDI, 116 CDI, 2.2 CDI facelift (2010-2014, OM651)
Typical failure mileage
100,000 - 150,000 miles
Root cause
The OM651 uses a simplex roller timing chain. A faulty chain tensioner can cause premature chain elongation, producing rattling on cold start and potential engine damage. Fuel pump failure (TSB 07.01.15) can also occur without warning on high-mileage examples.

Repair options

Repair tierDealer priceSpecialist price
Timing Chain & Tensioner Replacement£1,800-£2,800£1,200-£1,800
Full Replacement - Rebuilt OM651 Engine£4,000-£5,500£2,400-£3,500
Our recommendation
The OM651 timing chain stretch is a known weakness - if you hear rattling on cold start, have it inspected immediately. Engine-out replacement is technically complex, so choose a specialist who has done this job before. Post-2013 examples have improved chain components, but early OM651 engines (2010-2012) are most vulnerable.
-> Compare rebuilt OM651 Mercedes Viano 2.2 CDI engine prices

Viano 2.2 CDI Camshaft Encoder Wheel & EGR Cooler Issues

Affected
Mercedes Viano 2.2 CDI (OM646, OM651, all years)
Typical failure mileage
60,000 - 120,000 miles
Root cause
The camshaft encoder wheel can fail, causing rough starts, stalling at idle, and check engine lights. EGR cooler carbon lock (Euro IV OM646 engines, 2006-2010) causes restricted exhaust flow, power loss and limp mode.

Repair options

Repair tierDealer priceSpecialist price
Camshaft Sensor & Encoder Wheel Replacement£400-£700£250-£450
EGR Cooler Replacement£800-£1,200£500-£800
Full Replacement - Rebuilt Engine£3,000-£5,500£1,800-£3,500
Our recommendation
If your Viano 2.2 CDI stalls at idle or has rough starts, have the camshaft sensor and encoder wheel checked first - the encoder wheel is a known weak point. For Euro IV OM646 engines (2006-2010) used primarily for short trips, the EGR cooler will block again; consider a professional EGR delete (where MOT-legal) or switch to a specialist who can fit a modified cooling setup.
-> Get quotes for Viano 2.2 CDI sensor and EGR repairs

Don't Let Engine Failure Write Off Your Mercedes Viano 2.2 CDI

A failed 2.2 CDI engine doesn't have to mean the end of your Viano. Whether you're dealing with an OM646 timing chain tensioner, OM611 injector pump seal failure, or OM651 chain stretch, EnginesMarket makes it simple to compare prices from trusted UK Mercedes Viano 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 Viano 2.2 CDI Engine ReplacementFrequently Asked Questions

Everything Mercedes Benz Viano 2.2 CDI owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

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Comparing quotes for your Mercedes Viano 2.2 CDI engine replacement is completely free and carries no obligation - enter your registration above, receive tailored prices from UK specialists who know the OM611, OM646 and OM651 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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