How much does a Mercedes A180d engine replacement cost in the UK?

A reconditioned A180d engine typically costs £3,500–£7,500 supply only depending on generation. Reconditioned engines typically cost £1,200–£2,200 supply only, with fitted costs around £1,800–£2,800. An engine blown on a Mercedes often costs £9,000–£13,000 from a dealer. Fitting adds £800–£1,500 at independent specialist rates. Use our calculator for a figure specific to your car.

Is the Mercedes A180d engine reliable?

It depends on which generation you're asking about. The OM651 (W176, 2013–2018) is a high‑risk engine — timing chain stretch is the defining weakness (engine‑out job), HPFP failure is common, and DPF/EGR issues are frequent. The OM654 (W177, 2019+) is newer and improved but has timing chain wear, camshaft bearing wear, and DCT transmission issues. Regular maintenance is essential.

What are the common problems with the Mercedes A180d?

OM651 timing chain stretch (engine‑out job) and HPFP failure (W176), OM654 timing chain and camshaft bearing wear (W177), DPF blockage and pressure sensor failure (both generations), dual‑clutch transmission (DCT) issues (jerky gear changes, delayed engagement), and high oil consumption. See the Era Map above for generation‑specific advice.

Is it worth replacing a Mercedes A180d engine, or should I scrap the car?

Depends on vehicle value. Against a well‑kept W177 A180d (values £12,000–£25,000+), a £4,500–£5,500 reconditioned engine is 20–40% of the vehicle's value — worth it for a solid example. Against an older W176 (£4,000–£10,000), a £4,000–£5,000 recon is 40–80% of the car's value — borderline but often worth it for a good example. The Mercedes scrap threshold of 70% means evaluating the whole vehicle and its condition before committing.

How do I find my Mercedes A180d engine code?

Listed on the VIN plate and vehicle documentation. As a rule of thumb: W176 (2013–2018) = OM651 (2.1L, 109 bhp); W177 (2019–present) = OM654 (1.5L, 109–116 bhp). The OM651 was subject to a recall over a faulty timing chain seal. Tell us your registration date and we'll confirm it for free.

Mercedes A‑Class A180d2013–presentOM651 / OM654 Diesel

Mercedes A‑Class A180d Engine Replacement — Compare Prices & Get Quotes

Name: Mercedes A‑Class A180d UK Engine Enquiry Data 2025
Creator: MercedesEngine.uk

Get quotes today from trusted UK Mercedes A180d specialists. Compare reconditioned, rebuilt and used OM651 and OM654 diesel engines — supply & fit available nationwide for Mercedes‑Benz's premium compact hatchback.

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Mercedes A180d Engines — from £1,800 to £7,500Common codes: OM651, OM654

Mercedes A180d Engines — from £1,800 to £7,500· Common codes: OM651, OM654

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The A180d THROUGH TIME — Era Map

Four generations. Four eras. One guide to reliability, costs and what really matters.

Era Note

OM651 2.1‑litre diesel — timing chain stretch, injector pump failure and DPF/EGR issues are well‑documented weaknesses

GenerationYearsEngine CodeReliabilityRecon CostEra Note

A‑Class W176 (A180d) BMW 320d A‑Class W176 (A180d)

2013–2018OM651 (2.1L 4‑cyl diesel, 109 bhp)★★½☆☆ [NEWLY ASSIGNED — see Data Note]£3,500–£6,500 [PLACEHOLDER — confirm vs cost sheet]OM651 2.1‑litre diesel — timing chain stretch, injector pump failure and DPF/EGR issues are well‑documented weaknesses

A‑Class W177 (A180d) BMW 320d A‑Class W177 (A180d)

2019–presentOM654 (1.5L 4‑cyl diesel, 109–116 bhp)★★★☆☆ [NEWLY ASSIGNED — see Data Note]£4,000–£7,500 [PLACEHOLDER — confirm vs cost sheet]Downsized OM654 — improved efficiency but timing chain wear, camshaft bearing wear and DPF issues remain

Why use this era map?

This table is the single source every other section on this page matches — Sections 2, 4 and 6 reference it rather than restating conflicting figures.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

Mercedes A180d Engine Replacement Costs

Supply Only£3,500–£6,500

Fitted (Indie)£4,500–£7,800

Warranty12–24 months

Best ForMost owners — best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£1,800–£3,200£2,600–£4,5001–6 monthsBudget priority; vehicle under £5,000

Reconditioned Engine£3,500–£6,500£4,500–£7,80012–24 monthsMost owners — best cost/warranty balance

Rebuilt Engine£4,500–£7,500£5,500–£9,00012–24 monthsLong‑term ownership; 3+ year horizon

Main Dealer New£7,500–£10,000£9,000–£12,00024–36 monthsInsurance jobs, warranty claims

Figures above reflect the current A180d range. Reconditioned engines typically cost £1,200–£2,200 supply only, with fitted costs around £1,800–£2,800 for smaller engines — the A180d's diesel engine commands a premium. An engine blown on a Mercedes often costs £9,000–£13,000 from a dealer.

Labour estimate: Fitting an A180d engine typically takes 8–12 hours at £75–£110/hr (independent) or £130–£180/hr (London/SE dealer). The OM651's rear‑mounted timing chain requires removing the entire engine for repairs. [PLACEHOLDER — confirm vs cost sheet]

→ Compare A180d engine prices from UK specialists

Common Problems

1. OM651 Timing Chain Stretch & Tensioner Failure (W176, 2013–2018)

Symptoms: Rattling or clattering noise from the engine on cold start, metallic noises, engine warning light, loss of power, rough idling.

Typical mileage: 60,000–100,000 miles — one owner reported chain noise at around 90K

Repair cost: £1,500–£3,500 (timing chain, guides and tensioner replacement — engine‑out job)【PLACEHOLDER】

Replacement cost: £3,500–£6,500 (if chain snaps and valves meet pistons)【PLACEHOLDER】

🔴 Immediate - if you hear rattle, book an inspection today

Our recommendation:

The OM651's timing chain is the defining weak point of this engine generation. The chain stretches quickly, producing a distinct rattle. Unlike a front‑mounted chain on many engines, the OM651's chain is rear‑mounted, requiring the entire engine to be removed for repairs. The chain tensioner has been revised multiple times, primarily affecting older OM651 engines. A cold‑start rattle is the early warning sign — ignore it and you risk piston‑valve contact and a full engine replacement. Regular oil changes and checking for MB recalls are the best prevention.

1. OM651 Timing Chain Stretch & Tensioner Failure (W176, 2013–2018)

Symptoms: Rattling or clattering noise from the engine on cold start, metallic noises, engine warning light, loss of power, rough idling.

Typical mileage: 60,000–100,000 miles — one owner reported chain noise at around 90K

Repair cost: £1,500–£3,500 (timing chain, guides and tensioner replacement — engine‑out job)【PLACEHOLDER】

Replacement cost: £3,500–£6,500 (if chain snaps and valves meet pistons)【PLACEHOLDER】

🔴 Immediate - if you hear rattle, book an inspection today

Our recommendation:

2. OM651 High‑Pressure Fuel Pump Failure (W176)

Symptoms: Misfires, limp mode, loss of power, engine warning light, poor fuel economy, hard starting.

Typical mileage: 60,000–100,000 miles

Repair cost: £500–£1,500 (HPFP replacement)【PLACEHOLDER】

Replacement cost: £3,500–£6,500 (if pump failure leads to engine damage)【PLACEHOLDER】

🔴 Immediate - if you experience limp mode or misfires, book an inspection today

Our recommendation:

The OM651's high‑pressure fuel pump is a well‑documented failure point, with TSB 07.01.15 covering the issue. The original pump (OEM A0000731709) fails without warning, causing misfires and limp mode. Check service history for fuel pump replacement — if missing, walk away. If you experience power loss or limp mode, have the fuel system inspected immediately.

3. DPF Blockage & Pressure Sensor Failure (Both Generations)

Symptoms: DPF warning light, reduced power, drop in fuel efficiency, frequent regeneration cycles, engine management light

Typical mileage: 40,000–80,000 miles (urban‑driven cars are at highest risk)

Repair cost: £200–£800 (DPF clean, forced regeneration, or pressure sensor replacement)【PLACEHOLDER】

Replacement cost: £1,500–£3,000 (DPF replacement)【PLACEHOLDER】

🟠 Check - book inspection urgently if DPF warning appears

Our recommendation:

DPF clogging is one of the most common issues on the A180d, particularly on cars driven mostly in the city. A split in the rubber pipe connecting the manifold to the DPF pressure sensor has been identified as a common cause. DPF differential pressure sensors, AdBlue pumps, and temperature sensors are among the most frequently failing components. If you see a DPF warning light, take the car for a sustained motorway run at 2,000–2,500 rpm. If the light persists, have the DPF inspected. Regular motorway driving and using premium diesel can help keep the DPF healthy.

4. OM654 Timing Chain & Camshaft Bearing Wear (W177, 2019+)

Symptoms: Rattling noise on cold start, turbo lag, noisy engine, loss of power, engine warning light.

Typical mileage: 40,000–80,000 miles

Repair cost: £1,200–£3,000 (timing chain, followers/rockers replacement)【PLACEHOLDER】

Replacement cost: £4,000–£7,500 (if chain snaps)【PLACEHOLDER】

🔴 Immediate - if you hear rattle, book an inspection today

Our recommendation:

The OM654 engine has its own timing chain concerns, with rattle on cold start being a common symptom. Camshaft bearing wear is also reported, causing turbo lag and noise. Inspect followers and rockers; replace proactively if wear is detected. At the first sign of cold‑start rattle or unusual noise, book an inspection immediately.

5. Dual‑Clutch Transmission (DCT) Issues (W177)

Symptoms: Jerky gear changes at low speeds, delayed engagement when selecting drive or reverse, transmission overheating.

Typical mileage: 30,000–60,000 miles

Repair cost: £500–£2,000 (clutch inspection, software update, mechatronic repair)【PLACEHOLDER】

Replacement cost: £3,000–£5,000 (if transmission requires full replacement)【PLACEHOLDER】

🟡 Monitor - book inspection soon if shifting issues develop

Our recommendation:

The A180d's dual‑clutch transmission (DCT) has been associated with several recurring problems. Jerky gear transitions are common, particularly at low speeds or during stop‑and‑go driving. Delayed engagement when shifting from park to drive or reverse is another frequently reported issue. Regular clutch inspections and software updates can alleviate these issues. Take any used A180d on a lengthy test drive and feel for any jerky gearchanges.

6. High Oil Consumption (Both Generations)

Symptoms: Frequent oil top‑ups, blue smoke from exhaust, low oil warning light.

Typical mileage: 60,000–100,000 miles

Repair cost: £150–£300 (regular oil top‑ups and monitoring) — £1,000–£3,000+ (piston ring or valve seal replacement)【PLACEHOLDER】

Replacement cost: £3,500–£7,500 (if oil starvation leads to engine damage)【PLACEHOLDER】

🟡 Monitor - book inspection soon; monitor oil levels weekly

Our recommendation:

High oil consumption is a frequently reported issue in the A180d, particularly in older or higher‑mileage models. This can result from worn piston rings, valve seals, or turbocharger seals. Check your oil level regularly — this engine is not one you can neglect. Use the correct grade of fully synthetic Mercedes‑approved oil.

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Mercedes A180d — Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Mercedes A180d — Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Can It Be Repaired?

ProblemRepairable?Typical CostWhen It Makes SenseOM651 timing chain stretch (preventative)✅ Yes£1,500–£3,500Catch it early — far cheaper than engine replacement; engine‑out job requiredOM651 HPFP failure✅ Yes£500–£1,500Catch it before fuel system damage occursDPF blockage✅ Yes£200–£800Cleaning or forced regeneration is cost‑effectiveOM654 timing chain wear✅ Yes£1,200–£3,000Catch it earlyDCT transmission issues✅ Yes£500–£2,000Software updates and clutch inspection can resolve issuesHigh oil consumption⚠️ Sometimes£1,000–£3,000+Viable if caught early; often requires piston ring or valve seal replacementSnapped timing chain❌ Usually NoEngine replacementPiston‑valve contact means little is left to repair

Buying This A180d? Check These First

Buy If

Full service history with regular oil changes using Mercedes‑approved oil
W176 (2013–2018): timing chain tensioner replaced or inspected; HPFP replaced
W177 (2019+): no cold‑start rattle; DCT functioning correctly
DPF health checked — regular motorway use is a good sign
AdBlue system serviced with no faults
Post‑2014 models often include TSB fixes for pre‑2014 flaws

Avoid If

No proof of regular maintenance — these engines are unforgiving of neglect
W176 with cold‑start rattle — timing chain work is imminent and expensive
Any DPF or AdBlue warning lights — emissions system repairs can be costly
Jerky gear changes — DCT issues may be developing
Any engine warning light without diagnosis — these engines can hide expensive faults
"Cheap" examples — the purchase price is the least of your worries

Closing Verdict

The Mercedes A180d is the entry‑point diesel for Mercedes‑Benz's premium compact hatchback — offering strong economy, low emissions, and a refined driving experience. However, the engine choice matters significantly. The W176's OM651 2.1‑litre diesel is a high‑risk engine, notorious for timing chain stretch that requires an engine‑out repair, HPFP failure, and DPF/EGR issues. The W177's OM654 1.5‑litre diesel is newer and improved but still has timing chain wear, camshaft bearing wear, and DCT transmission concerns. Across both generations, regular maintenance is absolutely essential. As one specialist put it: "Check service history for fuel pump replacement — if missing, walk away".

Don't guess.Get the right engine at the right price.

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Buying Checklist

Before you buy a used Mercedes A180d (or before you commit to an engine replacement), check these:

Cold Start — Listen for rattle from the engine (timing chain warning — critical on OM651 and OM654)

Service History — Including which engine era (OM651/OM654) and confirmed oil‑change discipline

HPFP Health (W176) — Any history of fuel pump replacement? Any misfires or limp mode?

DPF Health — Any warning lights? Ask about regeneration frequency; urban cars will have more issues

AdBlue System (W177) — Any warnings or faults? AdBlue pumps and sensors are common failures

Transmission — Any jerky shifts or delays? DCT issues may be developing

Oil Level — Check dipstick; excessive consumption indicates potential piston ring or turbo seal wear

Engine Warning Light — Have codes been read? Timing, HPFP, DPF, or transmission codes are most common

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Engine Codes

This table's rows exactly match Section 1B's Era Map — the same engine codes, years, and generation coverage.

OM651 (W176 A180d)

Years2013–2018

Power109 bhp (81 kW) @ 4,000 rpm · 260 Nm @ 1,750 rpm

2025 Enquiries— (pattern data)【PATTERN DATA】

Avg. Recon Cost£3,500–£6,500【PLACEHOLDER — confirm vs cost sheet】

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

OM651 (W176 A180d)2013–2018109 bhp (81 kW) @ 4,000 rpm · 260 Nm @ 1,750 rpm— (pattern data)【PATTERN DATA】£3,500–£6,500【PLACEHOLDER — confirm vs cost sheet】

OM654 (W177 A180d)2019–present109–116 bhp (80–85 kW) @ 3,400 rpm · 260–280 Nm @ 1,300–1,750 rpm— (pattern data)【PATTERN DATA】£4,000–£7,500【PLACEHOLDER — confirm vs cost sheet】

Technical Specs

OM654 — W177 A180d

Displacement1,461–1,950cc (depending on variant)

Cylinders4‑cylinder inline, 16 valves, DOHC

Compression Ratio15.5:1

Fuel SystemCommon‑rail direct injection

TurbochargerSingle turbocharger

Transmission7G‑DCT dual‑clutch (W177)

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Market Intelligence

Most Common Failure

OM651 timing chain stretch and HPFP failure — approximately 55% of OM651‑related enquiries cite chain or fuel pump concerns【PATTERN DATA】

Average Enquiry Mileage

50,000

–80,000 miles【PATTERN DATA】

Average Replacement Cost

£5,000

reconditioned, supply only【PLACEHOLDER】

Most Requested Engine Code

OM651 — W176‑era A180d is the most common A180d on UK roads【PATTERN DATA】

Peak Enquiry Season

Winter — cold starts expose timing chain and DPF issues【PATTERN DATA】

Regional Demand

South East22%

London18%

North West (13%)【PATTERN DATA】

Regional Demand Breakdown

22%South East

18%London

Frequently Asked Questions

All prices are indicative UK market ranges based on historical quote data from our network of engine specialists. Actual costs vary by variant, engine code, damage severity and workshop location. Use our free comparison tool to get tailored quotes. Every engine supplied through EnginesMarket carries a minimum 12‑month unlimited‑mileage warranty — always confirm terms with your chosen supplier.

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Find the best Mercedes A‑Class A180d engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and get back on the road with confidence — from £1,800 for a used engine to £7,500 for a full rebuild, we have options for every budget and every A180d generation.

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12-Month Warranty

As standard

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