How much does a Mercedes Vito W639 engine replacement cost in the UK?

A reconditioned W639 engine typically costs £2,200–£6,500 supply only, depending on engine — the volume OM646 115 CDI diesel sits at £2,800–£4,800. Fitting adds £650–£1,200. Use our calculator for a personalised figure.

Which Mercedes Vito W639 engine is the most reliable?

The OM646 115 CDI (150 bhp) is the most proven W639 engine — a robust four-cylinder diesel with excellent durability and widespread parts availability. The OM642 V6 diesel (120/122 CDI) is also reliable but adds complexity and higher running costs.

What are the common problems with the Mercedes Vito W639?

The OM651 engine (post-2010) suffers from timing chain and tensioner wear (80k–120k miles). Both OM646 and OM651 diesels can suffer injector failure and turbocharger wear on higher-mileage examples. The OM642 V6 diesel has oil cooler seal leaks and injector seal failure ("Black Death"). The M272 petrol V6 carries balance shaft sprocket wear risk. Rust on rear wheel arches and sills is also a common issue.

Is the Mercedes Vito W639 reliable?

It depends heavily on engine choice and maintenance history. The OM646 diesel is the most robust option — it's a proven workhorse with many examples exceeding 200,000 miles. The OM651 offers newer emissions compliance but carries a timing chain risk; budget for inspection. The OM642 V6 is smooth and refined but more complex. Regular servicing and correct oil specification are essential for longevity, especially with the OM651's timing chain.

Which Mercedes Vito W639 engine should I avoid?

The OM651 (post-2010 109/113/116 CDI) without documented timing chain history is the one to approach with caution — chain and tensioner wear can occur from 80,000 miles and is expensive to fix (£1,200–£2,000). The M272 petrol V6 (123) also carries balance shaft risk on early examples. For commercial users, the OM646 115 CDI is the safest bet.

How do I know if my W639 engine needs replacing?

Cold-start rattle (OM651 timing chain), black carbon residue around injectors (diesel injector failure), oil in the V of the engine (OM642 oil cooler leak), blue smoke or loss of power (turbocharger failure) are the key warnings. Check engine lights, rough idle or difficulty starting also warrant immediate inspection.

Is it worth replacing a Mercedes Vito W639 engine, or should I scrap the van?

Depends on the van's value. Against a well-kept £6,000 Vito, a £2,800–£4,800 recon is 47–80% of the van's value — marginal but often justifiable for commercial users where replacement downtime is costly. Against a tired £3,000 example, the same recon is 93–160% — walk away unless the van is otherwise excellent. Our 70% Mercedes threshold is the line; commercial use may justify stretching it.

How long do Mercedes Vito W639 engines last?

The OM646 diesel can exceed 200,000 miles with proper servicing. The OM651 can also reach high mileages but timing chain work may be needed at 80k–120k miles. The OM642 V6 diesel is capable of 200,000+ miles with oil cooler maintenance. The W639 body and chassis are generally durable, though rust on rear wheel arches and sills is common on UK examples.

What is the difference between the Vito W639 and the Viano W639?

Both use the same W639 platform and engine range. The Vito is the commercial van, available as panel van, Mixto (crew cab) and passenger bus. The Viano is the luxury MPV variant, featuring more refined interiors, additional sound deadening and passenger-focused trim levels. Engine costs are identical; body-specific parts and interior trim differ. The Viano is covered on a separate generation page.

How do I find my Mercedes Vito W639 engine code?

Listed on the VIN plate (visible through the windscreen, lower passenger side), stamped on the engine block, and detailed in your vehicle registration documents (V5C). Tell us your variant (115 CDI, 120 CDI, etc.) and approximate registration date (pre- or post-2010 facelift), and we'll confirm it — 25+ vetted Mercedes specialists will verify it for free.

Mercedes Vito W639 Engines — The Complete UK Guide

Mercedes Vito W639 Engine Codes — The Complete Database

Every engine fitted to the W639 chassis — from the pre-facelift OM646 diesels to the post-2010 OM651 replacements, the OM642 V6 diesel and the M112/M272 petrol V6s.

Engine CodeFamilyFuelDisplacementPowerYears (W639)Variants (badges)Reliability2025 EnquiriesAvg. Recon Cost

OM646.980OM646Diesel I4, turbo2.2L (2148cc)88 bhp (65 kW)2003–2010109 CDI★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£2,200–£3,800 [MB-QUOTE]

OM646.981OM646Diesel I4, turbo2.2L (2148cc)95 bhp (70 kW)2006–2010109 CDI★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£2,200–£3,800 [MB-QUOTE]

OM646.982OM646Diesel I4, turbo2.2L (2148cc)109 bhp (80 kW)2003–2010110 CDI★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£2,500–£4,200 [MB-QUOTE]

OM646.983OM646Diesel I4, turbo2.2L (2148cc)116 bhp (85 kW)2004–2006111 CDI★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£2,500–£4,200 [MB-QUOTE]

OM646.982OM646Diesel I4, turbo2.2L (2148cc)150 bhp (110 kW)2003–2010115 CDI★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£2,800–£4,800 [MB-QUOTE]

OM651.940OM651Diesel I4, turbo2.2L (2143cc)95 bhp (70 kW)2010–2014109 CDI★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£2,500–£4,200 [MB-QUOTE]

OM651.940OM651Diesel I4, turbo2.2L (2143cc)136 bhp (100 kW)2010–2014113 CDI★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£2,800–£4,800 [MB-QUOTE]

OM651.940OM651Diesel I4, turbo2.2L (2143cc)163 bhp (120 kW)2010–2014116 CDI★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£3,000–£5,000 [MB-QUOTE]

OM642.990OM642Diesel V6, turbo3.0L (2987cc)204 bhp (150 kW)2006–2014120 CDI★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£3,500–£6,000 [MB-QUOTE]

OM642.890OM642Diesel V6, turbo3.0L (2987cc)224 bhp (165 kW)2006–2014122 CDI★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£3,800–£6,500 [MB-QUOTE]

M112.951M112Petrol V63.2L (3199cc)190 bhp (140 kW)2003–2008119★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£3,500–£5,500 [MB-QUOTE]

M272.945M272Petrol V63.5L (3498cc)231 bhp (170 kW)2004–2008123★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£4,000–£6,500 [MB-QUOTE]

Engine CodeFuelPowerYearsReliabilityEnquiriesAvg. Recon Cost

OM646.980OM646Diesel I4, turbo88 bhp (65 kW)2003–2010★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£2,200–£3,800 [MB-QUOTE]

OM646.981OM646Diesel I4, turbo95 bhp (70 kW)2006–2010★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£2,200–£3,800 [MB-QUOTE]

OM646.982OM646Diesel I4, turbo109 bhp (80 kW)2003–2010★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£2,500–£4,200 [MB-QUOTE]

OM646.983OM646Diesel I4, turbo116 bhp (85 kW)2004–2006★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£2,500–£4,200 [MB-QUOTE]

OM646.982OM646Diesel I4, turbo150 bhp (110 kW)2003–2010★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£2,800–£4,800 [MB-QUOTE]

OM651.940OM651Diesel I4, turbo95 bhp (70 kW)2010–2014★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£2,500–£4,200 [MB-QUOTE]

OM651.940OM651Diesel I4, turbo136 bhp (100 kW)2010–2014★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£2,800–£4,800 [MB-QUOTE]

OM651.940OM651Diesel I4, turbo163 bhp (120 kW)2010–2014★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£3,000–£5,000 [MB-QUOTE]

OM642.990OM642Diesel V6, turbo204 bhp (150 kW)2006–2014★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£3,500–£6,000 [MB-QUOTE]

OM642.890OM642Diesel V6, turbo224 bhp (165 kW)2006–2014★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£3,800–£6,500 [MB-QUOTE]

M112.951M112Petrol V6190 bhp (140 kW)2003–2008★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£3,500–£5,500 [MB-QUOTE]

M272.945M272Petrol V6231 bhp (170 kW)2004–2008★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£4,000–£6,500 [MB-QUOTE]

Overview

Mercedes Vito W639 — Overview

The Mercedes-Benz Vito W639 — the second generation of the popular medium van — launched in September 2003 and remained in production until 2014.

Based on a unibody platform shared with the Viano MPV, the W639 offered a wide range of body styles — panel van, Mixto (crew cab) and passenger bus — with rear-wheel drive as standard and optional 4MATIC all-wheel drive from 2010. The engine range included the OM646 four-cylinder diesels (pre-facelift), the OM651 four-cylinder diesels (post-2010), the OM642 V6 diesel and rare petrol V6 options. A significant facelift in 2010 brought revised styling, the new OM651 engine family and improved fuel economy.

Key Facts

Platform

Mercedes W639 (unibody)

Predecessor

W638 (1996–2003)

Successor

W447 (2014–present)

Sibling body styles in this generation

Viano (W639 luxury MPV)

Market Intelligence

No [MB-VERIFIED] enquiry data exists for the Vito W639 — the model is absent from EM_Proprietary_Data's per-model table, reflecting its commercial vehicle classification and different data capture.

Mercedes Vito W639 — Overview

The Mercedes-Benz Vito W639 — the second generation of the popular medium van — launched in September 2003 and remained in production until 2014.

Based on a unibody platform shared with the Viano MPV, the W639 offered a wide range of body styles — panel van, Mixto (crew cab) and passenger bus — with rear-wheel drive as standard and optional 4MATIC all-wheel drive from 2010. The engine range included the OM646 four-cylinder diesels (pre-facelift), the OM651 four-cylinder diesels (post-2010), the OM642 V6 diesel and rare petrol V6 options. A significant facelift in 2010 brought revised styling, the new OM651 engine family and improved fuel economy.

Key Facts

Platform

Mercedes W639 (unibody)

Predecessor

W638 (1996–2003)

Successor

W447 (2014–present)

Sibling body styles in this generation

Viano (W639 luxury MPV)

Market Intelligence

No [MB-VERIFIED] enquiry data exists for the Vito W639 — the model is absent from EM_Proprietary_Data's per-model table, reflecting its commercial vehicle classification and different data capture.

Best & Worst Engines

Thin-Data Summary

“The Vito W639's engine range spans from workhorse diesels to refined V6s. For most buyers, the OM646 115 CDI (150 bhp) is the standout — a robust, proven four-cylinder diesel with good power and excellent durability. Injector problems typically appear from 200,000 km (124,000 miles) and turbocharger damage from 250,000 km (155,000 miles). The post-2010 OM651 116 CDI (163 bhp) offers more power and better economy but carries a significant risk: simplex timing chain and tensioner wear — a costly repair that can exceed £1,500. The OM642 V6 diesel (120 CDI and 122 CDI) delivers smooth V6 refinement and 204–224 bhp, but shares the oil cooler seal leak and injector seal issues common to all OM642 applications. The petrol V6s (M112.951 3.2L and M272.945 3.5L) are rare in the UK and generally reliable, but the M272 carries balance shaft risk and fuel costs are high. Buying instruction: for commercial use, the OM646 115 CDI is the most sensible choice — proven, durable and well-supported. The OM651 offers newer emissions compliance but budget for timing chain inspection. The OM642 V6 diesel is the pick for those needing maximum power and refinement, but factor in oil cooler seal work on higher-mileage examples.”

Who it's for:

Thin-Data Summary

“The Vito W639's engine range spans from workhorse diesels to refined V6s. For most buyers, the OM646 115 CDI (150 bhp) is the standout — a robust, proven four-cylinder diesel with good power and excellent durability. Injector problems typically appear from 200,000 km (124,000 miles) and turbocharger damage from 250,000 km (155,000 miles). The post-2010 OM651 116 CDI (163 bhp) offers more power and better economy but carries a significant risk: simplex timing chain and tensioner wear — a costly repair that can exceed £1,500. The OM642 V6 diesel (120 CDI and 122 CDI) delivers smooth V6 refinement and 204–224 bhp, but shares the oil cooler seal leak and injector seal issues common to all OM642 applications. The petrol V6s (M112.951 3.2L and M272.945 3.5L) are rare in the UK and generally reliable, but the M272 carries balance shaft risk and fuel costs are high. Buying instruction: for commercial use, the OM646 115 CDI is the most sensible choice — proven, durable and well-supported. The OM651 offers newer emissions compliance but budget for timing chain inspection. The OM642 V6 diesel is the pick for those needing maximum power and refinement, but factor in oil cooler seal work on higher-mileage examples.”

Who it's for:

Mercedes Vito W639 — Ownership Economics

EngineTypical MileageCommon Major FailureRepair Cost (Specialist)Replacement Cost (Recon)Ownership Verdict

OM646.980/981 (109 CDI)100k–150k+Injector failure, turbo wear£400–£1,200£2,200–£3,800

Solid workhorse — durable and economical

OM646.982 (110/115 CDI)100k–150k+Injector failure, turbo wear£400–£1,200£2,500–£4,800

Best diesel — proven, reliable, well-supported

OM646.983 (111 CDI)100k–150k+Injector failure, turbo wear£400–£1,200£2,500–£4,200

Solid choice — reliable, less common

OM651.940 (109/113/116 CDI)80k–120kTiming chain wear£1,200–£2,500£2,500–£5,000

Watch — budget for chain inspection

OM642.990/890 (120/122 CDI)100k–180kOil cooler seal, injector seals£800–£1,500£3,500–£6,500

V6 refinement — smooth but complex

M112.951 (119)80k–120kCoil packs, lambda sensors£500–£1,200£3,500–£5,500

Rare petrol — reliable but thirsty

M272.945 (123)60k–100kBalance shaft sprocket£1,500–£3,000£4,000–£6,500

Watch — balance shaft risk

EngineTypical MileageCommon Major FailureRepair Cost (Specialist)Replacement Cost (Recon)Ownership Verdict

OM646.980/981 (109 CDI)100k–150k+Injector failure, turbo wear£400–£1,200£2,200–£3,800

Solid workhorse — durable and economical

OM646.982 (110/115 CDI)100k–150k+Injector failure, turbo wear£400–£1,200£2,500–£4,800

Best diesel — proven, reliable, well-supported

OM646.983 (111 CDI)100k–150k+Injector failure, turbo wear£400–£1,200£2,500–£4,200

Solid choice — reliable, less common

OM651.940 (109/113/116 CDI)80k–120kTiming chain wear£1,200–£2,500£2,500–£5,000

Watch — budget for chain inspection

OM642.990/890 (120/122 CDI)100k–180kOil cooler seal, injector seals£800–£1,500£3,500–£6,500

V6 refinement — smooth but complex

M112.951 (119)80k–120kCoil packs, lambda sensors£500–£1,200£3,500–£5,500

Rare petrol — reliable but thirsty

M272.945 (123)60k–100kBalance shaft sprocket£1,500–£3,000£4,000–£6,500

Watch — balance shaft risk

The W639 rule

A £2,500–£4,800 OM646 recon against a £2,000–£8,000 Vito sits at 31–240% of the van's value. On a sub-£3,000 example, that brushes our 70% Mercedes threshold — we'll honestly tell you to walk away. Against a well-kept £6,000+ example, the same recon drops to 42–80% — a repair decision, not a financial one. Value the van first. For commercial users, the cost of downtime often justifies the repair even when the maths is marginal.

Key Takeaways

Which W639 Costs Least To Own?
OM646 110/115 CDI — proven four-cylinder diesel, robust and economical.
Which W639 Costs Most To Own?
OM642 V6 diesel — V6 complexity, higher parts costs, more labour-intensive repairs.
Which W639 Is Best Value?
OM646 115 CDI — the most reliable engine in the range with strong power and excellent parts availability.

Common Problems

01

OM651

Timing Chain and Tensioner Wear

Affected models:

W639 109/113/116 CDI (OM651.940), 2010–2014.

Typical failure mileage:

80,000–120,000 miles.

Root cause:

The OM651 four-cylinder diesel engine uses a simplex timing chain and tensioner that can wear prematurely. The chain stretches and the tensioner loses hydraulic pressure, leading to rattling on cold start. If ignored, the chain can jump, causing piston-to-valve contact and catastrophic engine failure.

Tiered Cost Table

Our Recommendation

On any OM651-engined W639 with no documented chain history, treat this as overdue preventative maintenance — a £1,200–£2,000 repair is dramatically cheaper than the £2,800–£5,000 replacement that follows if ignored. Cold-start rattle is your warning; don't ignore it.

Compare OM651 engine prices for your Vito

02

OM646/OM651

Injector Failure

Affected models:

All OM646 and OM651 diesel-engined W639 variants.

Typical failure mileage:

100,000–150,000 miles (200,000 km+).

Root cause:

Injector problems are a well-documented weakness on both OM646 and OM651 diesel engines. Injectors can develop electrical faults, suffer from swarf contamination or leak combustion gases past the seals, causing the characteristic "Black Death" carbon buildup around the injector.

Tiered Cost Table

Our Recommendation

At the first sign of a diesel smell in the cabin, rough running or visible black residue around injectors, get the system inspected immediately — a £250–£500 seal replacement is far cheaper than the £900–£1,800 repair that follows if ignored.

Compare OM646/OM651 injector prices for your Vito

03

OM642

Oil Cooler Seal Leak

Affected models:

W639 120 CDI, 122 CDI (OM642.990/890), 2006–2014.

Typical failure mileage:

80,000–150,000 miles.

Root cause:

The oil cooler seals on the OM642 V6 diesel degrade over time, allowing oil to leak into the valley of the V6. The repair is labour-intensive, requiring removal of the intake manifold and significant disassembly.

Tiered Cost Table

Our Recommendation

On any OM642-engined W639 over 80,000 miles, budget for an oil cooler seal replacement — £800–£1,500 is a reasonable preventative cost to avoid potential engine damage from oil loss.

Compare OM642 engine prices for your Vito

04

Turbocharger

Failure (OM646/OM651)

Affected models:

All OM646 and OM651 diesel-engined W639 variants.

Typical failure mileage:

150,000+ miles (250,000 km+).

Root cause:

Turbocharger damage on higher-mileage CDI engines is a documented weakness. Symptoms include loss of power, excessive black smoke and a whistling noise from the engine bay. Oil starvation, contaminated oil or worn bearings are the primary causes.

Tiered Cost Table

Our Recommendation

On any high-mileage W639 diesel, ensure regular oil changes with the correct specification oil — a £150–£350 preventative oil service is cheaper than the £1,200–£2,000 turbo replacement that follows if ignored.

Compare turbocharger prices for your Vito

W639 Engine Replacement Costs — By Engine and Condition

VariantEngine CodeUsed (Supply)Reconditioned (Supply)Rebuilt (Supply)Labour Hours

109 CDIOM646.980/981£1,000–£1,800£2,200–£3,800£3,200–£5,00010–12 hrs

110 CDIOM646.982£1,200–£2,200£2,500–£4,200£3,500–£5,50010–12 hrs

111 CDIOM646.983£1,200–£2,200£2,500–£4,200£3,500–£5,50010–12 hrs

115 CDIOM646.982£1,500–£2,500£2,800–£4,800£4,000–£6,50010–12 hrs

109/113/116 CDI (post-2010)OM651.940£1,200–£2,500£2,500–£5,000£3,800–£6,50010–14 hrs

120 CDIOM642.990£1,800–£3,200£3,500–£6,000£5,000–£8,00012–16 hrs

122 CDIOM642.890£2,000–£3,500£3,800–£6,500£5,500–£8,50012–16 hrs

119M112.951£1,500–£2,800£3,500–£5,500£5,000–£7,50012–14 hrs

123M272.945£1,800–£3,200£4,000–£6,500£5,500–£8,50012–14 hrs

Core Variants

Diesel Variants

109 CDI110 CDI111 CDI115 CDI113 CDI116 CDI120 CDI122 CDI

Petrol Variants

119123

Scope note: All variants listed are W639 (Vito, 2003–2014) only. The Viano luxury MPV shares the same W639 platform and engine range but is covered on a separate Generation Page per the one-page-per-body-code rule. The 109 CDI was offered with both OM646.980 (88 bhp) and OM646.981 (95 bhp) depending on production date. The post-2010 facelift models use the OM651.940 engine across the 109 CDI, 113 CDI and 116 CDI variants, with power outputs of 95 bhp, 136 bhp and 163 bhp respectively. The 120 CDI (204 bhp) and 122 CDI (224 bhp) use the OM642 V6 diesel. Petrol variants (119 and 123) are rare in the UK market.

Core Variants

Diesel Variants

109 CDI110 CDI111 CDI115 CDI113 CDI116 CDI120 CDI122 CDI

Petrol Variants

119123

Scope note: All variants listed are W639 (Vito, 2003–2014) only. The Viano luxury MPV shares the same W639 platform and engine range but is covered on a separate Generation Page per the one-page-per-body-code rule. The 109 CDI was offered with both OM646.980 (88 bhp) and OM646.981 (95 bhp) depending on production date. The post-2010 facelift models use the OM651.940 engine across the 109 CDI, 113 CDI and 116 CDI variants, with power outputs of 95 bhp, 136 bhp and 163 bhp respectively. The 120 CDI (204 bhp) and 122 CDI (224 bhp) use the OM642 V6 diesel. Petrol variants (119 and 123) are rare in the UK market.

Market Intelligence

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FAQ

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Why UK Mercedes Vito W639 Owners Trust MercedesEngines.uk

Trusted W639 Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real Vito owners, as part of the Engine Finders network.
Compare W639 Engine Replacement Companies
see prices, warranty terms and supply-and-fit options side-by-side before you commit to any repair.
UK Engine Replacement Services for W639
covering every variant from the 109 CDI to the 122 CDI, with supply-only or full supply-and-fit available nationwide.

Find the best Mercedes Vito W639 engine replacement UK drivers rely on. Compare real prices from trusted Mercedes specialists on EnginesMarket today and get back on the road with confidence.

Compare Mercedes Vito W639 Engine Prices on EnginesMarket

Why UK Mercedes Vito W639 Owners Trust MercedesEngines.uk

Trusted W639 Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real Vito owners, as part of the Engine Finders network.
Compare W639 Engine Replacement Companies
see prices, warranty terms and supply-and-fit options side-by-side before you commit to any repair.
UK Engine Replacement Services for W639
covering every variant from the 109 CDI to the 122 CDI, with supply-only or full supply-and-fit available nationwide.

Find the best Mercedes Vito W639 engine replacement UK drivers rely on. Compare real prices from trusted Mercedes specialists on EnginesMarket today and get back on the road with confidence.

Compare Mercedes Vito W639 Engine Prices on EnginesMarket