C Class Diesel Engines
from £1,400 to £4,500
Rebuilt units from £1,400 · Common codes: OM651, OM646, OM654, OM642
Mercedes Benz ENGINE MARKETPLACE
Mercedes C Class M274/M264/M254 Timing Chain Solutions - UK Specialists
Get quotes from trusted UK Mercedes C Class engine specialists. Compare reconditioned & used engines for C180 to C63 S AMG - M274/M264/M254 covered. Get a quote before it's too late.
Supply & Fit Available
12-Month Warranty
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100+ Suppliers
C Class Petrol Engines
from £1,200 to £4,200
Rebuilt units from £1,200 · Common codes: M271, M274, M276, M270
C Class AMG Engines
from £6,500 to £15,000
Rebuilt units from £6,500 · Common codes: M156, M113, M276 (C43)
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Compare reconditioned, rebuilt & used engine prices
Supply & fit available - parts and labour from vetted specialistsInstant engine replacement quote - 100% free, no obligationEngine replacement near me - UK-wide specialist networkCompare reconditioned, rebuilt & used engine pricesSupply & fit available - parts and labour from vetted specialistsHow It Works
3 Simple Steps3 Simple Stepsto Finding the Best Mercedes Benz C Class Replacement Engineto Finding the Best Mercedes Benz C Class Replacement Engine
12-Month Warranty
Supply & Fit Available
Nationwide Delivery
Trusted UK Suppliers
Most replacements completed within 3-5 days.
Live UK Engine Market Data
What Are UK Drivers Paying for Mercedes Benz C Class Engine Replacement
The table below shows typical UK rebuilt engine costs across Mercedes Benz C Class variants, covering documented failure causes, chassis generations, engine codes, and fuel types based on current market data.
Average Market Prices
↻ Last updated: 4 Aug 26, 9:26
Customer Reviews
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Variants We Cover
Mercedes Benz C Class Engine ReplacementAll Variants Covered
Mercedes Benz C Class C220d
OM651 2.1L Diesel
Rebuilt Engines: £1,400-£3,500
Mercedes Benz C Class C250d
OM651 2.1L Diesel
Rebuilt Engines: £1,500-£3,800
Mercedes Benz C Class C180 Kompressor
M271 1.6L Petrol
Rebuilt Engines: £1,000-£2,400
Mercedes Benz C Class C200 CGI
M271 1.8L Petrol
Rebuilt Engines: £1,200-£2,800
Mercedes Benz C Class C200
M274 2.0L Petrol
Rebuilt Engines: £1,300-£3,200
Mercedes Benz C Class C300
M274 2.0L Petrol
Rebuilt Engines: £1,800-£4,200
Mercedes Benz C Class C350e
M274 2.0L PHEV
Rebuilt Engines: £3,000-£6,500
Not sure which variant your Mercedes Benz C Class is- Enter your registration number above - we’ll identify the exact sub-model, engine code and compatible replacement options instantly.
C Class
Engine Codes
Mercedes Benz C Class Engine CodesFull Technical Specifications & Replacement Guide
Every engine code fitted to the Mercedes Benz C Class across all generations, with technical specs, compatible variants and trims, known failure points, and average rebuilt prices from UK specialists. Select any engine code to compare quotes.
Diesel Engines
Extracted from detailed diesel engine families across Mercedes Benz C Class variants.
OM611 - 2.2L Diesel
Main replacement triggers are timing chain wear, EGR / cooling faults and turbo-control issues.
Compatible variants
C220 CDI (W203)C220 CDI ClassicC220 CDI EleganceC220 CDI Avantgarde
Avg. rebuilt price
£1,100 - £2,600
Supply only
Technical specifications
- Fuel type
- Diesel
- Engine size
- 2.2L
- Power output
- 102-143 hp
- Years fitted
- 2000-2014
Common failures
- ●Main replacement triggers are timing chain wear, EGR / cooling faults and turbo-control issues.
- ●Confirm exact engine code and fitment before ordering.
- ●Ask for warranty and supply & fit terms.
Not sure which engine code?
Can’t find your engine code- Enter your registration number above - we’ll instantly identify the exact unit, its technical specifications, and live replacement prices from UK Mercedes Benz C Class engine specialists. Every rebuilt engine comes with a minimum 12-month unlimited mileage warranty.
C Class
Common Problems
Mercedes Benz C Class Engine Problems - What It Costs to Fix & When Replacement Makes Sense
Mercedes Benz C Class OM651 Timing Chain Failure - Why Diesel Engines Fail Prematurely
Mercedes Benz C Class OM651 Timing Chain Failure
Most affected vehicles
Mercedes Benz C Class C200 CDIC220 CDI
Mercedes Benz C Class C200 CDI, C220 CDI, C250 CDI (W204, 2008-2014, OM651); C220d, C250d (W205, 2014-2018, OM651)
Failure mileage range
60,000 - 100,000 miles
Typical failure window
Root cause
The OM651 uses a timing chain mounted at the rear of the engine, adjacent to the gearbox. The chain stretches over time due to inadequate tensioner design and extended oil change intervals, eventually skipping teeth on the camshaft sprockets.
Repair options & estimated costs (UK ranges)
| Repair tier | Dealer price | Specialist price | What it involves | Longevity / suitability |
|---|---|---|---|---|
| Minor - Preventative Chain Replacement (early rattle only) | £1,200 - £1,800 | £700 - £1,100 | Replacement of timing chain, tensioners, guides, and sprockets (gearbox remains fitted, requires specialist tooling) | 60,000 - 80,000 miles; viable only if caught at first rattle before chain has jumped timing |
| Major - Post-Failure Rebuild (skipped timing, bent valves) | £3,500 - £5,500 | £2,200 - £3,800 | Cylinder head removal, valve replacement, piston inspection, full timing component replacement, oil system flush | 40,000 - 60,000 miles; high labour cost makes specialist rebuild marginal vs replacement |
| Full Replacement - Rebuilt / Recon Engine | £5,000 - £7,500 | £3,200 - £4,800 | Complete replacement with professionally rebuilt OM651 unit featuring upgraded timing components, new seals, bench tested | 80,000+ miles expected; best long-term value on higher-mileage cars |
Our recommendation
On a C Class worth £3,000-£6,000, the preventative timing chain replacement at an independent specialist (£700-£1,100) is the clear choice if your car rattles on cold start but hasn't skipped timing. Once the chain has jumped, the labour to rebuild the head pushes costs towards replacement territory. For high-mileage cars (120,000+ miles) with a failed engine, a rebuilt unit with upgraded timing components is more reliable than attempting a repair.
Compare OM651 rebuilt engine prices for your Mercedes Benz C ClassReplacement Engine Options
Mercedes Benz C Class Engine TypesOptions, Costs & What to Expect
Every engine type is available through our UK network with typical price ranges based on variant, engine code and budget.
Mercedes Benz C Class Reconditioned Engines (Recon)£1,800 - £4,500((supply only))
Mercedes Benz C Class Rebuilt Engines£1,400 - £3,800((supply only))
Mercedes Benz C Class Used Engines£800 - £2,200((supply only))
Mercedes Benz C Class Remanufactured Engines£2,200 - £5,500((supply only))
Mercedes Benz C Class Refurbished Engines£1,000 - £2,500((supply only))
Compare Mercedes Benz C Class engine prices with vetted UK suppliers
All engine types include a minimum 12-month unlimited mileage warranty when sourced through EngineMarket. Prices are typical UK market ranges based on historical quote data from our network and depend on exact engine code, variant, mileage and supplier. Use our free comparison tool above - enter your registration to get tailored quotes for your specific Mercedes Benz C Class within hours.
Engine Sizes
Mercedes Benz C Class Engines by SizeFind the Right Displacement for Your Variant
Every displacement fitted to the Mercedes Benz C Class across all UK generations is listed below, with compatible engine codes, model years, power outputs, and common failure points to help you identify your exact unit.
The 1.6-litre diesel, badged as the C180d, appeared in the W205 generation as an entry-level oil-burner using the OM626 engine. This Renault-sourced unit (Type R9M) was introduced to improve fuel economy and CO2 emissions, making the C-Class more accessible to fleet and economy-focused buyers. While economical, it lacks the refinement of Mercedes' larger in-house diesel designs.
⚙
Engine Code(s)
OM626 (Renault R9M)
▣
Compatible Models (UK)
C180d
ϟ
Power output
Verified by registration
△
Common Failure Points
Timing chain stretch, EGR valve clogging, AdBlue system crystallisation
Production Years: W205, 2014-2018
Get quotes for Mercedes Benz C Class 1.6L diesel enginesMercedes Benz C Class Engines Fuel Type
Mercedes Benz C Class Engines by Fuel Type
Mercedes Benz C Class Diesel Engines
DieselDiesel has dominated C-Class sales in the UK across three generations, with the OM651 2.1-litre becoming the most frequently replaced engine in the independent specialist network.
Common Mercedes Benz C Class Diesel Engine Families
- •OM611 - early common-rail 2.2-litre (W202/W203 C220 CDI), injector seal leaks
- •OM646 - refined 2.2-litre (W203/W204 C200 CDI/C220 CDI), improved reliability but retains seal issues
- •OM651 - 2.1-litre backbone of W204 and early W205 range, timing chain failure epidemic
Found In
- •W202 (1993-2000) - OM611
- •W203 (2000-2007) - OM611, OM646
- •W204 (2007-2014) - OM646, OM651, OM642
Known For
- •Exceptional motorway fuel economy across all generations
- •OM651 rear-mounted timing chain stretch (60k-100k miles) - highest replacement driver
- •Injector seal "black death" carbon buildup on OM611/OM646/OM651
Typical Diesel Models
- •C220 CDI (W203, W204)
- •C250 CDI (W204)
- •C220d (W205, W206)
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Mercedes Benz C Class Diesel Engines
DieselDiesel has dominated C-Class sales in the UK across three generations, with the OM651 2.1-litre becoming the most frequently replaced engine in the independent specialist network.
Common Mercedes Benz C Class Diesel Engine Families
- •OM611 - early common-rail 2.2-litre (W202/W203 C220 CDI), injector seal leaks
- •OM646 - refined 2.2-litre (W203/W204 C200 CDI/C220 CDI), improved reliability but retains seal issues
- •OM651 - 2.1-litre backbone of W204 and early W205 range, timing chain failure epidemic
Found In
- •W202 (1993-2000) - OM611
- •W203 (2000-2007) - OM611, OM646
- •W204 (2007-2014) - OM646, OM651, OM642
Known For
- •Exceptional motorway fuel economy across all generations
- •OM651 rear-mounted timing chain stretch (60k-100k miles) - highest replacement driver
- •Injector seal "black death" carbon buildup on OM611/OM646/OM651
Typical Diesel Models
- •C220 CDI (W203, W204)
- •C250 CDI (W204)
- •C220d (W205, W206)
Mercedes Benz C Class Petrol Engines
PetrolPetrol-powered C-Class models range from supercharged Kompressor four-cylinders to the legendary M156 V8 in the C63 AMG, with the M274 turbo 2.0-litre dominating W205 replacement enquiries.
Common Mercedes Benz C Class Petrol Engine Families
- •M111 - 2.0-litre four-cylinder (W202 C180/C200), simple but ageing
- •M271 - 1.6/1.8-litre supercharged and CGI (W203/W204), timing chain and cam adjuster failures
- •M272 - 2.5/3.0/3.5-litre V6 (W203/W204), balance shaft wear on early units
Found In
- •W202 (1993-2000) - M111
- •W203 (2000-2007) - M271, M272
- •W204 (2007-2014) - M271, M272, M276, M156
Known For
- •M271 timing chain and camshaft adjuster failures (50k-80k miles)
- •M274 piston cracking / wrist pin seizure - NHTSA investigation opened
- •M156 head bolt failure on engines below #060658 - preventative replacement recommended
Typical Petrol Models
- •C180 Kompressor (W203, W204)
- •C200 CGI (W204)
- •C200 (W205, W206)
Mercedes Benz C Class Mild Hybrid (MHEV) Engines
MHEVThe W206 generation introduced 48V mild hybrid technology across the petrol range, using an integrated starter-generator (ISG) for coasting, electric assistance, and smoother stop-start operation.
Mercedes Benz C Class MHEV Engine Codes
- •M254 - 1.5-litre and 2.0-litre four-cylinder with 48V ISG (W206 C180/C200/C300)
- •48V beltless integrated starter-generator replaces conventional alternator and starter
- •Recovers braking energy to power a 48V lithium-ion battery
Found In
- •C180, C200, C300 (W206, 2021-present)
Important Notes
- •MHEV system adds complexity to engine replacement - hybrid components require specialist handling
- •48V battery health should be inspected during any engine swap
- •Replacement availability is currently more limited than conventional petrol units
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Not sure which fuel type your Mercedes Benz C Class has- Enter your registration number above to instantly identify your engine code, fuel system and compatible replacement options - all backed by a minimum 12-month unlimited mileage warranty from UK Mercedes Benz C Class specialists.
Engine YearsGet quotes for 1993-2000 Mercedes Benz C Class replacement engines →
Mercedes Benz C Class Engines by YearWhat Was Fitted & WhenMercedes Benz C Class Engines by Year - What Was Fitted & When
From the W202’s bulletproof M111 petrols to the W206’s electrified M254 mild hybrids, this timeline covers every engine change across six generations of the Mercedes-Benz C-Class in the UK market.
⚙Key Changes
- ✓Launch of W202 sedan (S202 estate from 1996) as first official C-Class
- ✓C 36 AMG introduced 1995 (268hp), replaced by C 43 AMG (302hp 4.3L V8) in 1998
- ✓1997 facelift: new V6 for C 280, supercharged 2.3L for C 230
- ✓Diesels remained naturally aspirated (no turbo) throughout generation
▣Main Engines
M111- 1.8L / 2.0L / 2.2L petrol (C 180 / C 200 / C 220)
M104- 2.8L inline-six petrol (C 280) - most reliable C-Class engine ever built
OM604- 2.2L four-cylinder diesel (C 220 Diesel)
OM605- 2.5L five-cylinder diesel (C 250 Diesel) - capable of 500,000+ km
▰Popular Models
- •Mercedes Benz C 180 (W202)
- •Mercedes Benz C 200 (W202)
- •Mercedes Benz C 280 (W202)
- •Mercedes Benz C 250 Diesel (W202)
- •Mercedes Benz C 43 AMG (W202)
🔧Known For
- ✓Legendary M104 six-cylinder petrol - considered indestructible with proper maintenance
- ✓OM605 five-cylinder diesel regularly exceeds 300,000 miles
- ✓Simple, non-turbocharged designs with fewer failure points than modern engines
- ✓Pre-facelift rust issues on bodywork (engines remain solid)
- ✓Early OM604 four-cylinder diesels are noisy but reliable
Engine Codes Covered:
M111M104OM604OM605M112 (late C 280 V6)Not sure which year your Mercedes Benz C Class was built- Enter your registration number and we’ll identify the exact engine, model year, and compatible replacement options instantly - all backed by a minimum 12-month warranty from UK Mercedes Benz C Class specialists.
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