Mercedes Benz Viano 2.2 CDI Engine ReplacementCompare 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.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
From £1,200 to £3,000
Used from £500 · Reconditioned from £1,400 · Common codes: OM611, OM646, OM651
From £500
Tested, bare/short engine
From £1,400
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
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3 Simple Steps3 Simple Stepsto Finding the Best Mercedes Benz Viano 2.2 CDI Replacement Engineto Finding the Best Mercedes Benz Viano 2.2 CDI Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryMercedes 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.
Variant HistoryMercedes 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
Fuel TypeDiesel
Engine Size2.2L (2,148cc)
Power Output Range90-163hp across the 2.2 CDI's historyEngine History Timeline
W638 Viano launched with OM611 2.2L common-rail diesel 90-125hp, Bosch injection system
W639 Viano launched with OM646 2.2L diesel (modified OM611) 109-150hp, Euro III emissions
OM646 gains Euro IV emissions compliance with EGR cooler and DPF
W639 facelift introduces OM651 2.2L diesel with 136-163hp twin-turbo on higher-output variants
Viano production ends replaced by Mercedes V-Class
Key Specs Snapshot
Fuel TypeDieselEngine Size2.2L (2,148cc)Power Output Range90-163hp across the 2.2 CDI's historyYears Produced1996-2014Every 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.
Mercedes Benz Viano 2.2 CDI Engine Codes - Specifications & Replacement CostMercedes Benz Viano 2.2 CDI Engine Codes - Specifications & Replacement Cost
2.2L Diesel (1996-2003)
Power Output90-125 hp (60-95 kW)Displacement2,151cc (early) / 2,148cc (later)ConfigurationInline-4, DOHC, common-rail direct injection, variable turbine geometry turbochargerYears Fitted1996-2003
Compatible Trim Levels
- Viano 2.2 CDI (W638)
- Viano 108 CDI
- Viano 110 CDI
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£450-£900
Reconditioned
Addressed known issues, tested
£1,200-£1,600
Rebuilt
Full teardown, upgraded internals
£1,200-£1,800
Common Failure
The OM611's injector pump seal can fail, allowing diesel fuel to leak into the engine oil sump. Fuel-diluted oil causes rapid bearing wear, low oil pressure and eventual catastrophic engine failure.
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.
Why the Viano 2.2 CDI Rattles on Cold Start
Affected Vehicles
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.
Why It Happens
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.
Dealer (parts + labour)
£1,200-£1,800
Specialist (parts + labour)
£768-£1,280
What it involves
Replace timing chain, updated dual-spring tensioner (A6460502201), guides, sprockets
Suitability
80k-100k miles; only viable if caught before chain slip
1 - 2 daysDealer (parts + labour)
£3,000-£4,500
Specialist (parts + labour)
£1,800-£2,800
What it involves
Supply & fit reconditioned OM646 with upgraded tensioner, reinforced guide rails, 12-month warranty
Suitability
100k+ miles; the definitive fix for engines with timing damage or skipped chains
1 - 2 daysAll prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 Preventative - Timing Chain Kit Replacement Minor | £1,200-£1,800 | £768-£1,280 | Replace timing chain, updated dual-spring tensioner (A6460502201), guides, sprockets | 80k-100k miles; only viable if caught before chain slip | 1 - 2 days |
 Full Replacement - Rebuilt OM646 Engine Best Value | £3,000-£4,500 | £1,800-£2,800 | Supply & fit reconditioned OM646 with upgraded tensioner, reinforced guide rails, 12-month warranty | 100k+ miles; the definitive fix for engines with timing damage or skipped chains | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical W639 Viano 2.2 CDI is worth £3,000-£8,000 depending on condition and mileage - the full replacement cost of £1,800-£2,800 is modest relative to vehicle value for most examples. For vehicles worth under £3,000, evaluate repair options first.
Our Recommendation
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.
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.
Compare rebuilt OM646 engine prices for your Mercedes Viano 2.2 CDI
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
"All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific Mercedes Viano 2.2 CDI. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
Mercedes Viano 2.2 CDI Engine ReplacementFrequently Asked Questions
Question 1How much does a Mercedes Viano 2.2 CDI engine replacement cost in the UK-
A Viano 2.2 CDI engine replacement typically costs between £1,200 and £3,000 depending on engine code (OM611, OM646 or OM651), condition type, and whether fitting is included.
- Rebuilt OM611 (W638, 1996-2003): £1,200-£1,800 supply only
- Rebuilt OM646 (W639, 2003-2010): £1,400-£2,500 supply only
- Rebuilt OM651 (W639 facelift, 2010-2014): £1,800-£3,000 supply only
- Used engines from breakers: £450-£1,600 but higher risk
- Labour for supply & fit adds £400-£800 to any engine price
Question 2What is the most common failure on the Mercedes Viano 2.2 CDI engine-
The most common failure depends on the engine generation. On the OM646 (2003-2010), timing chain tensioner failure (A6460500307) is the dominant issue, causing rattle on cold start and potential catastrophic engine failure.
- OM611 (W638, 1996-2003): injector pump seal failure - diesel in oil
- OM646 (W639, 2003-2010): timing chain tensioner failure - cold start rattle
- OM651 (W639 facelift, 2010-2014): timing chain stretch and fuel pump failure
- Camshaft encoder wheel failure can cause stalling and rough starts across all variants
Question 3Is the OM646 engine in the Viano 2.2 CDI reliable-
The OM646 is fundamentally a strong engine - many examples exceed 200,000-250,000 miles - but it has one critical weakness: the timing chain tensioner.
- Timing chain tensioner failure is predictable between 80k-140k miles
- Cold start rattle is the earliest warning sign
- Updated dual-spring tensioner (A6460502201) is the permanent fix
- Catch it early - preventative chain replacement costs £768-£1,280 at a specialist
- Once the chain slips, piston-valve contact means a full replacement engine
Question 4What are the signs of timing chain failure on a Viano 2.2 CDI-
The 2.2 CDI timing chain typically shows warning signs before complete failure.
- Rattling or clanking noise on cold start - the earliest warning sign
- Rattle that lasts more than 2-3 seconds indicates significant chain stretch
- Check engine light with cam/crank correlation codes (P0016/P0017)
- If ignored, the chain can jump teeth and destroy the engine
- Metallic swarf in engine oil indicates chain guides wearing away
Question 5Should I repair or replace my Viano 2.2 CDI engine-
Repair if the failure is isolated (e.g., timing chain tensioner on OM646, injector pump seals on OM611, sensors). Replace if there's bottom end damage, bore scoring, or catastrophic timing chain failure.
- OM646 timing chain tensioner replacement: £768-£1,280 - do this at first sign of rattle
- OM611 injector pump seal replacement: £350-£600 - do this immediately if oil level rises
- Camshaft sensor & encoder wheel: £250-£450 - resolves stalling and rough starts
- Full OM646 rebuild: £1,800-£2,800 - for catastrophic failure or 120k+ miles
- Full OM651 rebuild: £2,400-£3,500 - for catastrophic failure or 120k+ miles
- Given Viano 2.2 CDI values (£3,000-£10,000), a rebuilt engine is typically good value
Question 6How do I know which engine code my Viano 2.2 CDI has-
Check your vehicle log book (V5C) for the engine number, which includes the engine code prefix.
- V5C log book shows full engine number with code prefix
- Engine code stamped on cylinder block near the starter motor
- W638 Viano (1996-2003): OM611
- W639 Viano (2003-2010): OM646 (109 CDI, 111 CDI, 115 CDI)
- W639 facelift Viano (2010-2014): OM651 (113 CDI, 116 CDI)
- Service history documents list engine type
Question 7Can I fit a used Viano 2.2 CDI engine myself-
We strongly advise against DIY fitting on a Viano 2.2 CDI. The W639 subframe geometry and ECU coding requirements demand specialist equipment and expertise.
- Subframe must be lowered - not a driveway job
- 9G-Tronic or 6-speed manual alignment requires specialist knowledge
- Immobiliser and injector coding must be programmed
- Specialist supply & fit costs £400-£800 - worth every penny
Question 8What warranty comes with a reconditioned Viano 2.2 CDI engine-
Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty, with many specialists offering 24-month coverage on OM646 and OM651 rebuilds. This includes parts and labour for any manufacturing defect or installation error.
- 12-month unlimited mileage is the minimum standard
- OM646 and OM651 rebuilds often include 24-month warranty
- All warranties cover parts, labour, and MOT compliance
- Extended warranties available at point of purchase
Why Choose UsCompare Mercedes Viano 2.2 CDIEngine PricesToday
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12-Month Warranty on every rebuilt Viano 2.2 CDI engine
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