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Mercedes-Benz A Class Engine ReplacementCompare Prices & Save
Get quotes today from trusted UK Mercedes-Benz A Class engine specialists. Compare prices on reconditioned, rebuilt and used engines - supply & fit available.
A Class Diesel Engines - from £1,400 to £4,800
-> Rebuilt units from £1,400 · Common codes: OM651, OM654, OM607, OM611
A Class Petrol Engines - from £1,200 to £4,200
-> Rebuilt units from £1,200 · Common codes: M270, M264, M282, M274
A Class AMG Performance Engines - from £4,500 to £12,000
-> Rebuilt units from £4,500 · Common codes: M133, M139, M260
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3 Simple Stepsto Finding the Best Mercedes Benz A Class Replacement Engine
Get Instant Quotes from Mercedes - Benz Engine Specialists Across the UK - 100% free, no obligation. Most replacements completed within 3-5 days.
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Live UK Engine Market Data
What Are UK Drivers Paying for Mercedes-Benz A Class Engine Replacement?
The table below shows typical UK rebuilt engine costs across Mercedes-Benz A Class variants, covering documented failure causes, chassis generations, engine codes, and fuel types based on current market data.
Average Market Prices
- Mercedes-Benz A Class (W176) A45 AMG2013-2015£12,000-£15,000Complete engine failureM133Petrol 2.0L
- Mercedes-Benz A Class (W176) A180d2015-2018£2,200-£3,800DPF blockageOM607Diesel 1.5L
- Mercedes-Benz A Class (W177) A2002018-2022£1,600-£3,000HPFP failureM282Petrol 1.3L
- Mercedes-Benz A Class (W177) A180d2018-2022£2,200-£4,000DPF blockageOM607Diesel 1.5L
- Mercedes-Benz A Class (W177) A200d2018-2022£2,500-£4,500EGR valve failureOM654Diesel 2.0L
- Mercedes-Benz A Class (W177) A250e2019-2024£3,000-£5,500Hybrid battery/coolingM282+EMPHEV Petrol 1.3L
- Mercedes-Benz A Class (W177) A35 AMG2019-2023£4,500-£8,000Turbo wastegateM260Petrol 2.0L
- Mercedes-Benz A Class (W168) A1401997-2002£1,200-£2,200Head gasket failureM166Petrol 1.4L
- Mercedes-Benz A Class (W168) A160 CDI1997-2001£1,800-£3,200Turbo failureOM668Diesel 1.7L
- Mercedes-Benz A Class (W169) A160 CDI2004-2008£2,000-£3,500Timing chain wearOM640Diesel 2.0L
- Mercedes-Benz A Class (W169) A180 CDI2004-2008£2,000-£3,500Timing chain wearOM640Diesel 2.0L
- Mercedes-Benz A Class (W169) A200 Turbo2004-2011£1,500-£2,800Turbo failureM266Petrol 2.0L
- Mercedes-Benz A Class (W176) A180 CDI2012-2015£1,800-£3,000Head gasket failureOM651Diesel 1.8L
- Mercedes-Benz A Class (W176) A200 CDI2012-2015£1,800-£3,000Head gasket failureOM651Diesel 1.8L
- Mercedes-Benz A Class (W176) A2002012-2018£1,600-£3,200Timing chain tensionerM270Petrol 1.6L
Last updated: 22 May, 14:59
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Models We Cover
Mercedes-Benz A Class Engine ReplacementAll Variants Covered
From the economical A140 to the high-performance A45 S AMG, our network of UK Mercedes-Benz A Class engine specialists helps you compare rebuilt, reconditioned and used engine prices. A typical rebuilt unit with 12-month warranty ranges from £1,400 to £15,000 - supply & fit available nationwide.
Core Diesel Range
Specs107hp
Years2012-2018
Rebuilt£2,200-£3,800
Core Petrol Range
Performance & Hybrid Range
Variant Directory
Diesel Variants
A160 CDIA170 CDIA180 CDIA180dA190A200 CDIA200dA220 CDIA220dA250e (MHEV diesel option not available)B180 CDI (A-Class platform) - Diesel engine variants include BlueEFFICIENCY, CDI, d, and BlueTEC badging across W168, W169, W176, and W177 generations.
Petrol Variants
A140A150A160A170A180A190A200A200 SportA210 EvolutionA220A250A250 SportA260A45 AMGA45 S AMGA35 AMGA250eBlueEFFICIENCY petrolEQ Boost mild hybrid (M264)Kompressor variants (A170, A200 Kompressor)Performance & Hybrid VariantsA35 AMGA45 AMGA45 S AMGA250e Plug-In HybridAMG Line (performance appearance)EQ Boost mild hybrid system on selected M264 petrol variants (2018 onwards)Race-Start enabled AMG modelsNot sure which variant your Mercedes-Benz A Class is? Enter your registration number above - we’ll identify the exact sub‑model, engine code and compatible replacement options instantly.
Engine Codes
Mercedes-Benz A Class Engine CodesFull Technical Specifications & Replacement Guide
Every engine code fitted to the Mercedes-Benz A 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 A Class variants.
Petrol Engines
Extracted from detailed petrol and performance engine families across Mercedes Benz A Class variants.
Hybrid / Electrified Engines
Extracted from electrified powertrains and hybrid engine families used in Mercedes Benz A Class variants.
Can't find your engine code?
Common Problems
Mercedes-Benz A Class Engine Problems
What It Costs to Fix & When Replacement Makes Sense
Every rebuilt engine includes a minimum 12-month unlimited mileage warranty.
1. Mercedes-Benz A Class Timing Chain Failure
Why M270 & OM651 Petrol and Diesel Engines Fail
Affected Models
A180, A200, A250 (W176, M270 petrol); A180 CDI, A200 CDI, A220 CDI (W176, OM651 diesel); 2012-2018
Typical Failure Mileage
80,000 - 150,000 miles
Root Cause
The M270 petrol and OM651 diesel engines use a single timing chain located at the rear of the engine near the gearbox. The plastic chain tensioner guides wear prematurely and the hydraulic tensioner can lose pressure, allowing chain stretch and camshaft timing drift .
Repair Options & Estimated Costs (UK ranges)
| Repair Tier | Dealer Price | Specialist Price | What It Involves | Longevity / Suitability |
|---|---|---|---|---|
Preventative Timing Chain & Tensioner Replacement Minor | £2,200 - £3,200 | £1,400 - £2,200 | Replacement of timing chain, tensioner, guides, sprockets, and camshaft adjuster bolts | Best done at first rattle (cold start). Prevents catastrophic failure. |
Full Replacement - Rebuilt / Reconditioned Engine Best Value | £5,000 - £8,000 | £2,500 - £5,500 | Complete supply & fit of a rebuilt engine with upgraded timing components | Required if chain has jumped (bent valves). Includes 12-month warranty. |
Our Recommendation
Best next step for mercedes-benz a class timing chain failure
If you hear a rattling noise from the rear of the engine on cold starts - especially between 80,000 and 120,000 miles - act immediately. A preventative chain replacement at a specialist saves thousands compared to waiting for failure. Once the chain jumps, piston-to-valve contact is almost certain and engine replacement becomes the only viable option.
Don't Let Engine Failure Write Off Your Mercedes-Benz A Class
Engine failure doesn't always mean the end of the road. Whether your A-Class needs a preventative timing chain replacement on an OM651 diesel, a recall-compliant HPFP on an M264 petrol, or a full M133 AMG rebuild, EngineMarket makes it simple to compare prices from trusted UK Mercedes-Benz A-Class engine specialists.
Compare Mercedes-Benz A Class Engine Replacement Prices Now →Mercedes-Benz A Class Engine Problems
What It Costs to Fix & When Replacement Makes Sense
Affected Models
A180, A200, A250 (W176, M270 petrol); A180 CDI, A200 CDI, A220 CDI (W176, OM651 diesel); 2012-2018
Typical Failure Mileage
80,000 - 150,000 miles
Root Cause
The M270 petrol and OM651 diesel engines use a single timing chain located at the rear of the engine near the gearbox. The plastic chain tensioner guides wear prematurely and the hydraulic tensioner can lose pressure, allowing chain stretch and camshaft timing drift .
Preventative Timing Chain & Tensioner Replacement
Dealer
£2,200 - £3,200
Specialist
£1,400 - £2,200
Replacement of timing chain, tensioner, guides, sprockets, and camshaft adjuster bolts
Best done at first rattle (cold start). Prevents catastrophic failure.
Full Replacement - Rebuilt / Reconditioned Engine
Dealer
£5,000 - £8,000
Specialist
£2,500 - £5,500
Complete supply & fit of a rebuilt engine with upgraded timing components
Required if chain has jumped (bent valves). Includes 12-month warranty.
Our Recommendation
Best next step for mercedes-benz a class timing chain failure
If you hear a rattling noise from the rear of the engine on cold starts - especially between 80,000 and 120,000 miles - act immediately. A preventative chain replacement at a specialist saves thousands compared to waiting for failure. Once the chain jumps, piston-to-valve contact is almost certain and engine replacement becomes the only viable option.
Don't Let Engine Failure Write Off Your Mercedes-Benz A Class
Engine failure doesn't always mean the end of the road. Whether your A-Class needs a preventative timing chain replacement on an OM651 diesel, a recall-compliant HPFP on an M264 petrol, or a full M133 AMG rebuild, EngineMarket makes it simple to compare prices from trusted UK Mercedes-Benz A-Class engine specialists.
Compare Mercedes-Benz A Class Engine Replacement Prices Now →Disclaimer: 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 EngineMarket'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-Benz A Class and engine code. Every engine supplied through EngineMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier.
12-Month Warranty
Upgraded Components
Nationwide UK Delivery
Save vs Main Dealer Price
Replacement Engine Options
Mercedes-Benz A Class Engine TypesOptions, Costs & What to Expect
Every engine type is available through our UK network with typical price ranges based on your A Class variant, engine code and budget.
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 A Class within hours.
Engine Sizes
Mercedes-Benz A Class Engines by SizeFind the Right Displacement for Your Variant
Every displacement fitted to the Mercedes-Benz A Class across all generations is listed below, with compatible engine codes, production years and common failure notes to help you identify your exact engine.
Mercedes-Benz A Class Diesel Engine Sizes
The 1.5-litre diesel entered the A-Class range with the W176 generation (2012-2018) as the entry-level A180d, using a Renault-sourced OM607 engine. This unit prioritised fuel economy over performance, returning up to 68.9mpg and CO2 emissions as low as 98g/km, making it popular for company car drivers. It was replaced in the W177 by an updated version of the same displacement.
| Engine Code(s) | OM607 (Renault K9K) |
| Compatible Models (UK) | A180d (W176, 2012-2018); A180d |
| Production Years | W177, 2018-present |
Common Failure Points
Watch for these known weak points
Timing belt replacement required every 80,000-100,000 miles; injector seal leaks; turbo actuator failure
Not sure which engine size your Mercedes-Benz A Class needs? Enter your registration number above - we'll identify the exact displacement, engine code and compatible replacement options instantly. All engines supplied through EngineMarket include a minimum 12-month unlimited mileage warranty from UK Mercedes-Benz A Class specialists.
Mercedes-Benz A Class Engines Fuel Type
Mercedes-Benz A Class Engines by Fuel Type
Choose your Mercedes-Benz A Class engine by fuel type to compare realistic replacement prices, known issues, and compatible UK supply options - from the early W168 A140 to the latest W177 A45 S AMG.
Mercedes-Benz A Class Diesel Engines
Mercedes-Benz A Class Diesel Engines
Diesel power spanned four A-Class generations from 1997 to the present day, with OM600, OM640, OM607, OM651 and OM654 families driving replacement demand - particularly on W176 and W177 models.
Common Engine Families
OM668 - W168 A160 CDI (1.7L), first common-rail diesel in an A-Class
OM640 - W169 A160/A180/A200 CDI (2.0L), timing chain tensioner weakness
OM607 - W176/W177 A180d (1.5L), Renault-sourced, timing belt service critical
OM651 - W176 A180/A200/A220 CDI/d (1.8L/2.1L), EGR cooler cracking & rear chain failure
OM654 - W177 A180d/A200d/A220d (2.0L), AdBlue crystallisation & NOx sensor failures
Found In
W168 (1997-2004) - OM668
W169 (2004-2012) - OM640
W176 (2012-2018) - OM607, OM651
W177 (2018-present) - OM607, OM651 (early), OM654
Known For
Excellent motorway economy - many variants exceed 60mpg
OM651 EGR cooler failure causing coolant loss (60k-100k miles)
OM607 timing belt requires replacement every 80k-100k miles
OM654 AdBlue system faults triggering countdown-to-no-start
Not sure which fuel type your Mercedes-Benz A 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 A Class specialists.
Engine Years
Mercedes-Benz A Class Engines by YearWhat Was Fitted & When
Every major engine change across the A-Class production timeline from 1997 to 2026, organised so owners can quickly identify their engine and compare rebuilt engine prices from UK specialists.
1997-2004 - W168 First Generation: M166 Petrol Launch
Major Platform Change
The original A-Class introduced Mercedes' first transverse front-wheel drive layout with the revolutionary "sandwich" floorpan - engines slid underneath occupants in a frontal impact .
Key Changes
Launch of the compact MPV-style A-Class (W168)
1998: OM668 common-rail diesel added to range
2001: Facelift with revised suspension and standard ESP (post-moose test)
2002: A210 Evolution flagship with 2.1L M166
Known For
Revolutionary sandwich floor design - engine goes under occupants in a crash
Failed moose test at launch - ESP became standard on all cars
M166 petrol engines are near-indestructible (300k+ km achievable)
OM668 diesel injector and turbo failures - first-gen common-rail teething issues
Main Engines
M166 E14 - 1.4L petrol (A140)
M166 E16 - 1.6L petrol (A160)
M166 E19 - 1.9L petrol (A190)
M166 E21 - 2.1L petrol (A210 Evolution)
OM668 DE17 - 1.7L diesel (A160 CDI / A170 CDI)
Popular Models
Mercedes-Benz A140
Mercedes-Benz A160
Mercedes-Benz A190
Mercedes-Benz A210 Evolution
Mercedes-Benz A160 CDI / A170 CDI
Engine Codes Covered
M166M166 E14M166 E16M166 E19M166 E21OM668OM668 DE17
Common Replacement Enquiries
Mercedes A140 engine replacement
Mercedes A160 engine reconditioned
Mercedes A170 CDI engine failure
Mercedes A-Class W168 engine price
Get quotes for 1997-2004 Mercedes-Benz A Class replacement engines
1997-2004 - W168 First Generation: M166 Petrol Launch
Major Platform Change
The original A-Class introduced Mercedes' first transverse front-wheel drive layout with the revolutionary "sandwich" floorpan - engines slid underneath occupants in a frontal impact .
Key Changes
Launch of the compact MPV-style A-Class (W168)
1998: OM668 common-rail diesel added to range
2001: Facelift with revised suspension and standard ESP (post-moose test)
2002: A210 Evolution flagship with 2.1L M166
Known For
Revolutionary sandwich floor design - engine goes under occupants in a crash
Failed moose test at launch - ESP became standard on all cars
M166 petrol engines are near-indestructible (300k+ km achievable)
OM668 diesel injector and turbo failures - first-gen common-rail teething issues
Main Engines
M166 E14 - 1.4L petrol (A140)
M166 E16 - 1.6L petrol (A160)
M166 E19 - 1.9L petrol (A190)
M166 E21 - 2.1L petrol (A210 Evolution)
OM668 DE17 - 1.7L diesel (A160 CDI / A170 CDI)
Engine Codes Covered
M166M166 E14M166 E16M166 E19M166 E21OM668OM668 DE17
Popular Models
Mercedes-Benz A140
Mercedes-Benz A160
Mercedes-Benz A190
Mercedes-Benz A210 Evolution
Mercedes-Benz A160 CDI / A170 CDI
Common Replacement Enquiries
Mercedes A140 engine replacement
Mercedes A160 engine reconditioned
Mercedes A170 CDI engine failure
Mercedes A-Class W168 engine price
Get quotes for 1997-2004 Mercedes-Benz A Class replacement engines
Year Finder
Not sure which year your Mercedes Benz A Class was built?
Not sure which year your Mercedes-Benz A 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 A Class specialists.
FAQ
Mercedes-Benz A Class Engine ReplacementFrequently Asked Questions
Question 1
How much does a Mercedes-Benz A Class engine replacement cost in the UK?
A replacement engine for a Mercedes-Benz A Class typically costs between £1,200 and £15,000 depending on the engine code, generation and condition. Used units start from £800-£2,500, rebuilt from £1,800-£5,500, and AMG engines from £8,000-£15,000.
Key points
- • Used A180d (OM607) engines: £800-£1,500 depending on mileage
- • Rebuilt M270 petrol units (A180/A200): £1,600-£3,200 supply only
- • Rebuilt OM651 diesel units (A200 CDI/A220 CDI): £2,500-£4,800
- • A45 AMG M133 rebuilt engines: £8,000-£12,000 from specialists
- • Labour for supply & fit adds £400-£800 to any engine price
Question 2
Which Mercedes-Benz A Class engines have timing chain problems?
The M270 petrol (2012-2018 A180/A200/A250) and OM651 diesel (2012-2018 A180 CDI/A200 CDI/A220 CDI) engines are most known for timing chain tensioner failure. The chain sits at the rear of the engine, making replacement labour-intensive.
Key points
- • M270 timing chain rattle typically appears between 80,000-150,000 miles
- • OM651 rear-mounted chain requires gearbox removal for replacement
- • Preventative chain replacement costs £1,400-£2,200 at a specialist
- • Catastrophic chain failure causes bent valves - replacement engine needed
- • Post-2018 M260/M282 and OM654 engines have improved chain designs
Question 3
Is the Mercedes-Benz A Class OM651 diesel engine reliable?
The OM651 is generally robust but has two well-documented weak points: EGR cooler cracking and timing chain tensioner failure. Post-2014 models received updated components that improved reliability, but preventative maintenance remains essential.
Key points
- • EGR cooler cracks cause coolant loss and white smoke from exhaust
- • HPFP failure on early OM651 units documented in TSB 07.01.15
- • Post-2014 models include fixes for pre-2014 common flaws
- • Regular oil changes every 10,000 miles minimise chain wear
- • Many specialists offer upgraded EGR coolers with reinforced brazing
Question 4
What is the most reliable Mercedes-Benz A Class engine to buy used?
The M270 1.6L petrol (2012-2018 A180/A200) is widely considered the safest A-Class engine for used buyers. It has no AdBlue system, fewer emissions components than diesels, and timing chain issues are predictable and repairable before failure.
Key points
- • M270 petrol avoids DPF, AdBlue and EGR cooler failure risks of diesels
- • A200 petrol returns 48.7mpg - competitive with diesel for mixed driving
- • OM607 diesel (A180d) is Renault-sourced and timing belt needs 80k-100k changes
- • Post-2018 M282 petrol co-developed with Renault - generally reliable
- • Avoid early OM651 diesels (2012-2014) with unresolved HPFP issues
Question 5
How long does a Mercedes-Benz A Class engine last?
A well-maintained A-Class petrol engine typically lasts 150,000-200,000 miles, while diesels regularly exceed 200,000-250,000 miles. The OM651 diesel in particular is capable of 300,000+ miles when serviced properly and timing chain issues are addressed proactively.
Key points
- • M270 petrol: 150k-200k miles with regular oil changes
- • OM651 diesel: 200k-300k miles - timing chain is the limiting factor
- • OM654 diesel (2018+): Too new for full data, but build quality is excellent
- • M282 petrol (2018+): 150k+ miles expected, HPFP is weak point
- • Critical factors: Oil changes every 10k miles, not ignoring warning signs
Question 6
What causes the Mercedes-Benz A Class M270 engine to lose power?
Power loss on M270 engines is most commonly caused by timing chain stretch (causing cam timing drift), HPFP failure, or boost pressure sensor issues. A 2014 A200 owner on MBClub reported struggling past 70mph with no fault codes - intermittent boost sensor faults are notoriously hard to diagnose.
Key points
- • Stretched timing chain allows camshaft timing to drift - reduces power
- • HPFP failure causes misfires and limp mode without warning codes
- • Boost pressure sensor faults can be intermittent and code-free
- • Camshaft adjuster solenoid failure also causes power loss
- • Diagnostic with Mercedes STAR system is essential for accurate fault finding
Question 7
Is the Mercedes-Benz A Class A250e plug-in hybrid engine reliable?
The A250e PHEV (M282 petrol + electric motor) has no recurrent reported failures according to European reliability studies. The 1.3L petrol unit is proven, and the electric motor integrated into the gearbox has been reliable. Battery degradation over time is the main long-term consideration.
Key points
- • No chronic failures reported on the hybrid system as of 2024
- • Electric-only range of 44 miles (WLTP) - battery health check recommended
- • HV battery replacement is expensive (£3,000-£5,000) if out of warranty
- • High-voltage system requires EV-trained specialist for engine work
- • Cooling system leaks reported on some early electric motor units
Question 8
Should I replace or repair my Mercedes-Benz A Class engine?
Repair if the issue is timing chain or EGR cooler caught early. Replace if the engine has suffered timing chain snap (bent valves), HPFP failure that sent metal through the fuel system, or piston ring failure on AMG models. For A-Class cars worth under £3,000, a used engine swap often beats major repairs.
Key points
- • Preventative timing chain replacement (£1,400-£2,200) beats engine replacement (£2,500-£5,500)
- • EGR cooler replacement (£500-£900) prevents hydrolock damage
- • HPFP metal contamination requires full engine replacement - flushing won't guarantee safety
- • On W168/W169 worth £1k-£3k, used engine + fitting is most economical
- • A45 AMG M133 rebuild (£8k-£12k) - compare against vehicle value
Question 9
What are the common problems with Mercedes-Benz A Class diesel engines?
The OM651 (2012-2018) suffers EGR cooler cracking, timing chain tensioner wear, and HPFP failure. The OM654 (2018+) has AdBlue crystallisation and NOx sensor failures. The OM607 (A180d) has a timing belt needing replacement every 80,000-100,000 miles and injector seal leaks.
Key points
- • OM651 EGR cooler cracks between 60k-100k miles - coolant loss, white smoke
- • OM654 AdBlue system faults trigger countdown-to-no-start messages
- • OM607 timing belt is an interference engine - failure means catastrophic damage
- • DPF blockage common on all diesels used for short journeys only
- • Post-2014 OM651 units have improved HPFP and chain tensioner designs
Question 10
How do I find the correct engine code for my Mercedes-Benz A Class?
Your A-Class engine code is in the vehicle service booklet, on a sticker in the driver's door shut, or stamped on the engine block. You can also enter your registration number into our tool above for instant identification. Common A-Class codes include M270, M282, OM651, OM654 and OM607.
Key points
- • Check service booklet or driver's door sill sticker for "M" or "OM" code
- • Engine block stamp visible near cylinder head or oil filter housing
- • VIN decoder tools can identify original factory engine code
- • A180/A200 petrol 2012-2018: M270
- • A180/A200 petrol 2018+: M282
- • A180d 2012+: OM607 / A200d/A220d 2018+: OM654 / A200 CDI 2012-2018: OM651
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