B Class Diesel Engines
from £1,300 to £4,800
Rebuilt units from £1,800 · Common codes: OM651.901, OM607.951, OM654.920, OM651.930
Mercedes-Benz ENGINE MARKETPLACE
Mercedes B Class M270/OM651/M282 Engine Solutions - UK Specialists
Get quotes from trusted UK Mercedes B Class engine specialists. Compare reconditioned & used engines for B180 to B250e - M270/OM651/M282 covered. Get a quote before it's too late.
Supply & Fit Available
12-Month Warranty
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100+ Suppliers
B Class Petrol Engines
from £1,200 to £4,200
Rebuilt units from £1,500 · Common codes: M270.910, M282.914, M266.960, M274.920
B Class Performance Engines
from £2,500 to £6,500
Rebuilt units from £2,800 · Common codes: M260.920, OM651.930 (B220 CDI), M270.910 (B250)
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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 B Class Replacement Engineto Finding the Best Mercedes Benz B 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 B Class Engine Replacement
The table below shows typical UK rebuilt engine costs across Mercedes-Benz B 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
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Variants We Cover
Mercedes-Benz B Class Engine ReplacementAll Variants Covered
Mercedes-Benz B Class B180d
OM654.920 2.0L Diesel
Rebuilt Engines: £1,900-£3,200
Mercedes-Benz B Class B200d
OM654.920 2.0L Diesel
Rebuilt Engines: £1,900-£3,500
Mercedes-Benz B Class B160
M270.910 1.6L Petrol
Rebuilt Engines: £1,200-£2,000
Mercedes-Benz B Class B250e Plug-In Hybrid
M282 1.3L Petrol
Rebuilt Engines: £3,500-£5,500
Mercedes-Benz B Class B170
M266.960 1.7L Petrol
Rebuilt Engines: £1,100-£2,000
Not sure which variant your Mercedes-Benz B Class is- Enter your registration number above - we'll identify the exact sub-model, engine code and compatible replacement options instantly.
B Class
Engine Codes
Mercedes-Benz B Class Engine CodesFull Technical Specifications & Replacement Guide
Every engine code fitted to the Mercedes-Benz B 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 B Class variants.
OM651.901 - 2.0L / 2.2L Diesel
Main replacement triggers are timing chain wear, EGR / cooling faults and turbo-control issues.
Compatible variants
B180 CDI (W246)B200 CDI (W246)
Avg. rebuilt price
£1,800 - £2,800
Supply only
Technical specifications
- Fuel type
- Diesel
- Engine size
- 1.8L / 2.1L
- Power output
- 109-136 hp
- Years fitted
- 2011-2018
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 B Class engine specialists. Every rebuilt engine comes with a minimum 12-month unlimited mileage warranty.
B Class
Common Problems
Mercedes-Benz B Class Engine Problems - What It Costs to Fix & When Replacement Makes Sense
The Mercedes-Benz B Class is broadly reliable, but specific engine families - particularly the diesel OM651 and petrol M270/M266 units - have well-documented failure points that can lead to costly repairs or complete engine replacement. Below we break down the most common B Class engine problems, what they cost to fix at a dealer versus a specialist, and...
Mercedes-Benz B Class Timing Chain Failure - Why OM651 & M270 Petrol Engines Fail Prematurely
Mercedes-Benz B Class Timing Chain Failure
Most affected vehicles
Mercedes-Benz B Class B180 CDIB200 CDI (2011-2014
Mercedes-Benz B Class B180 CDI, B200 CDI (2011-2014, OM651.901); B220 CDI (2013-2018, OM651.930); B160, B180, B200 (2011-2018, M270.910); B250 (2013-2018, M270.920)
Failure mileage range
60,000 - 100,000 miles
Typical failure window
Root cause
The timing chain tensioner loses hydraulic pressure, allowing chain slack and guide rail fracture. On OM651 diesels, the chain is located at the rear of the engine (gear side), requiring gearbox removal. On M270 petrol units, chain stretch and camshaft adjuster wear combine to cause rattle and eventual valve timing errors.
Repair options & estimated costs (UK ranges)
| Repair tier | Dealer price | Specialist price | What it involves | Longevity / suitability |
|---|---|---|---|---|
| Preventative - Timing Chain & Tensioner Replacement | £1,600 - £2,400 | £900 - £1,400 | Replace chain, tensioner, guides, and camshaft adjusters (petrol). No engine removal. | 60k-80k miles if caught early. Suitable only before chain jumps or guides fail. |
| Intermediate - Chain Failure With Valve Damage | £3,500 - £5,000 | £2,200 - £3,200 | Remove cylinder head, replace bent valves, guides, full timing set, head gasket. | Engine retains original block. Labour-intensive. Viable if no piston or bore damage. |
| Full Replacement - Rebuilt / Reconditioned Engine | £6,000 - £8,500 | £2,800 - £4,200 | Supply & fit of fully rebuilt engine with upgraded timing components, bench tested, 12-month warranty. | 100k+ mile lifespan. Best value when damage extends to pistons, bearings, or cylinder head. |
Our recommendation
On a B Class worth £3,000-£6,000, a full dealer repair exceeding £4,000 rarely makes sense. If your OM651 or M270 engine is rattling on cold start but still running smoothly, a specialist preventative chain replacement (£900-£1,400) is excellent value. If the chain has already jumped and valves are bent, compare rebuilt engine prices - a specialist fitted unit at £2,800-£4,200 often costs less than a dealer head rebuild and delivers a fresh warranty.
Compare rebuilt OM651 & M270 engine prices for your Mercedes-Benz B ClassReplacement Engine Options
Mercedes-Benz B 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 B Class Reconditioned Engines (Recon)£1,800 - £3,500((supply only))
Mercedes-Benz B Class Rebuilt Engines£1,500 - £2,800((supply only))
Mercedes-Benz B Class Used Engines£900 - £1,800((supply only))
Mercedes-Benz B Class Remanufactured Engines£2,200 - £4,200((supply only))
Mercedes-Benz B Class Refurbished Engines£1,200 - £2,200((supply only))
Compare Mercedes Benz B 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 B Class within hours.
Engine Sizes
Mercedes-Benz B Class Engines by SizeFind the Right Displacement for Your Variant
Every displacement fitted to the Mercedes-Benz B Class is listed below, with compatible engine codes, production years and common failure notes verified from UK market data.
The 1.5-litre OM607 four-cylinder diesel was co-developed with Renault (badged 1.5 dCi) and fitted to entry-level B Class models from 2014 onward. This EU5/EU6 compliant unit prioritised fuel economy over performance and became the subject of a major Mercedes emissions software update affecting several hundred thousand UK cars in 2017-2018 .
⚙
Engine Code(s)
OM607.951
▣
Compatible Models (UK)
B160 CDI, B180 CDI
ϟ
Power output
Verified by registration
△
Common Failure Points
Injector seal leaks, EGR valve clogging, DPF blockage from short-trip driving
Production Years: W246, 2014-2018
Get quotes for Mercedes-Benz B Class 1.5L diesel enginesMercedes-Benz B Class Engines Fuel Type
Mercedes-Benz B Class Engines by Fuel Type
Choose your Mercedes-Benz B Class engine by fuel type to compare realistic replacement prices, known issues, and compatible UK supply options - from the early W245 B150 to the latest W247 B250e plug-in hybrid.
Mercedes-Benz B Class Diesel Engines
DieselThe backbone of UK B Class sales across three generations, with high-mileage longevity balanced against well-documented timing chain and emissions system concerns on OM651 and OM654 units.
Common Mercedes-Benz B Class Diesel Engine Families
- •OM640.940 - original W245 unit (B180 CDI / B200 CDI), simple but injector-prone
- •OM607.951 - 1.5-litre Renault-derived engine, subject to EU5 emissions updates
- •OM651.901 - high-volume 1.8/2.0-litre, known for timing chain and EGR cooler failure
Found In
- •W245 (2005-2011) - OM640.940
- •W246 (2011-2018) - OM607.951, OM651.901, OM651.930
- •W247 (2019-Present) - OM654.920
Known For
- •Excellent motorway fuel economy (55-65 mpg real-world)
- •OM651 timing chain tensioner failure between 60k-100k miles
- •DPF and EGR cooler blockages on short-journey cars
Typical Diesel Models
- •B180 CDI (W245 / W246)
- •B200 CDI (W245 / W246)
- •B220 CDI (W246)
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Mercedes-Benz B Class Diesel Engines
DieselThe backbone of UK B Class sales across three generations, with high-mileage longevity balanced against well-documented timing chain and emissions system concerns on OM651 and OM654 units.
Common Mercedes-Benz B Class Diesel Engine Families
- •OM640.940 - original W245 unit (B180 CDI / B200 CDI), simple but injector-prone
- •OM607.951 - 1.5-litre Renault-derived engine, subject to EU5 emissions updates
- •OM651.901 - high-volume 1.8/2.0-litre, known for timing chain and EGR cooler failure
Found In
- •W245 (2005-2011) - OM640.940
- •W246 (2011-2018) - OM607.951, OM651.901, OM651.930
- •W247 (2019-Present) - OM654.920
Known For
- •Excellent motorway fuel economy (55-65 mpg real-world)
- •OM651 timing chain tensioner failure between 60k-100k miles
- •DPF and EGR cooler blockages on short-journey cars
Typical Diesel Models
- •B180 CDI (W245 / W246)
- •B200 CDI (W245 / W246)
- •B220 CDI (W246)
Mercedes-Benz B Class Petrol Engines
PetrolA diverse petrol lineup spanning naturally aspirated simplicity (M266) through turbocharged direct injection (M270) to the latest Renault co-developed M282 unit - each with distinct failure patterns.
Common Mercedes-Benz B Class Petrol Engine Families
- •M266.960 - 1.5/1.7/2.0-litre naturally aspirated (W245), oil consumption common
- •M270.910 - 1.6-litre turbo (W246), camshaft and timing chain failure
- •M270.920 - 2.0-litre turbo (B250), HPFP and timing guide wear
Found In
- •W245 (2005-2011) - M266.960 (1.5L, 1.7L, 2.0L variants)
- •W246 (2011-2018) - M270.910 (1.6L), M270.920 (2.0L)
- •W247 (2019-Present) - M282.914 (1.3L)
Known For
- •M266 units: simple to service but heavy oil consumption after 80k miles
- •M270 engines: camshaft bearing wear and adjuster failure from 50k-90k miles
- •Carbon buildup on intake valves (direct injection) on M270 and M282
Typical Petrol Models
- •B150 / B170 / B200 (W245)
- •B160 / B180 / B200 / B250 (W246)
- •B180 / B200 (W247)
Mercedes-Benz B Class Plug-in Hybrid (PHEV) Engines
PHEVThe B250e combined the 1.3-litre M282 petrol engine with an electric motor for urban EV capability and petrol range flexibility - offered only on the W247 generation between 2019 and 2022.
Mercedes-Benz B Class PHEV Engine Codes
- •M282.914 (1.3L turbo petrol) + permanent magnet synchronous electric motor
- •Electric-only range of up to 40 miles (WLTP) from 15.6 kWh battery
- •Petrol engine engages automatically for longer journeys or hard acceleration
Found In
- •B250e, B250e AMG Line, B250e Sport (W247, 2019-2022)
Important Notes
- •No plug-in hybrid variants exist outside the B250e nameplate
- •High-voltage battery degradation affects EV range and hybrid system performance
- •Replacement engines require specialist hybrid system recoding
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Not sure which fuel type your Mercedes-Benz B 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 B Class specialists.
Engine YearsGet quotes for 2005-2008 Mercedes-Benz B Class replacement engines →
Mercedes-Benz B Class Engines by YearWhat Was Fitted & WhenMercedes-Benz B Class Engines by Year - What Was Fitted & When
From the 2005 launch of the first-generation compact MPV to the latest current-generation models, this timeline covers every major engine change across the B Class range - helping you identify your exact unit and compare rebuilt engine prices from UK specialists.
⚙Key Changes
- ✓New compact MPV platform (W245) with front-wheel drive
- ✓Launch engines: M266 petrol (1.5L, 1.7L, 2.0L) and OM640 diesel (2.0L)
- ✓Five-speed manual and CVT automatic transmissions offered
- ✓B150, B170, B200 petrol; B180 CDI, B200 CDI diesel
▣Main Engines
M266.960- 1.5L / 1.7L / 2.0L petrol (B150 / B170 / B200)
OM640.940- 2.0L diesel (B180 CDI / B200 CDI)
▰Popular Models
- •Mercedes-Benz B150
- •Mercedes-Benz B170
- •Mercedes-Benz B200
- •Mercedes-Benz B180 CDI
- •Mercedes-Benz B200 CDI
🔧Known For
- ✓Clever sandwich floor platform for crash safety and flat load floor
- ✓M266 engines are simple but prone to oil consumption beyond 80k miles
- ✓OM640 diesel is robust but injector and turbo failures common at high mileage
- ✓CVT transmission (Autotronic) has reliability concerns
Engine Codes Covered:
M266.960OM640.940Not sure which year your Mercedes-Benz B 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 B Class specialists.
FAQ