How much does a Mercedes‑Benz A200 CDI engine replacement cost in the UK?

A reconditioned OM640 engine typically costs £1,500–£3,500 supply only; the OM651 costs £2,500–£6,500. Fitting adds £800–£1,400. Timing chain replacement on the OM651 can cost £1,500–£3,500 if caught early. Use our calculator for a figure specific to your car.

Is the Mercedes‑Benz A200 CDI engine reliable?

It depends on the generation. The OM640 (W169, 2004–2012) is rated ★★★☆☆ — a robust cast‑iron block diesel with injector and EGR issues as the main weaknesses. The OM651 (W176, 2012–2018) is rated ★★½☆☆ — refined but problematic, with timing chain stretch, injector failure, and EGR/DPF issues all well‑documented.

What are the common problems with the Mercedes‑Benz A200 CDI?

OM651 timing chain stretch (the most critical — can destroy the engine), injector leak‑off pipe failure (diesel smell/pooling), injector failure, EGR valve clogging, and DPF issues. The OM640 is generally more reliable than the OM651.

Is it worth replacing a Mercedes‑Benz A200 CDI engine, or should I scrap the car?

Depends on vehicle value and generation. Against a well‑kept W176 A200 CDI worth £4,000–£8,000, a £3,500 recon is a significant investment — assess carefully. For a W169 with the OM640, the engine is generally more robust and replacement is often worthwhile if the body is solid.

How do I find my Mercedes‑Benz A200 CDI engine code?

Listed on the VIN plate and vehicle documentation. The A200 CDI uses OM640.941 (W169, 2004–2012) or OM651.930 (W176, 2012–2018). Tell us your registration date and we'll confirm it for free.

Can I repair the OM651's timing chain, or does it need a new engine?

Yes — if caught early. A timing chain and tensioner replacement (£1,500–£3,500) is far cheaper than a catastrophic chain snap (£2,500–£6,500 engine replacement). At the first sign of cold‑start rattle, book an inspection immediately. The chain is located at the rear of the engine, so it's a labour‑intensive job, but it's far cheaper than a new engine.

Mercedes-Benz A-Class A200 CDI2004–20182 Engine Generations

Mercedes-Benz A-Class A200 CDI Engine Replacement — Compare Prices & Get Quotes

Get quotes today from trusted UK Mercedes-Benz A200 CDI specialists. Compare reconditioned, rebuilt and used OM640 and OM651 engines — supply & fit available nationwide.

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Mercedes A200 CDI Engines — from £1,500 to £6,500Common codes: OM640.941, OM651.930

Mercedes A200 CDI Engines — from £1,500 to £6,500· Common codes: OM640.941, OM651.930

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The A200 CDI THROUGH TIME — Era Map

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

Era Note

The original 2.0 CDI — cast-iron block, chain-driven; injector and EGR issues are the main watchpoints.

GenerationYearsEngine CodeReliabilityRecon CostEra Note

W169

2004–2012OM640.941 (2.0 CDI)★★★☆☆ [NEWLY ASSIGNED — see Data Note]£1,500–£3,500 [MB‑QUOTE]The original 2.0 CDI — cast-iron block, chain-driven; injector and EGR issues are the main watchpoints.

W176

2012–2018OM651.930 (1.8/2.1 CDI)★★½☆☆ [NEWLY ASSIGNED — see Data Note]£2,500–£6,500 [MB‑QUOTE]Mercedes' 2.1-litre diesel — timing chain stretch and injector failure are the defining weaknesses.

Why use this era map?

Every cost guide, reliability rating and engine code on this page is aligned to the data above. This keeps everything consistent and trustworthy.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

Mercedes-Benz A-Class A200 CDI Engine Replacement Costs

Supply Only£2,000–£4,500

Fitted (Indie)£2,800–£5,700

Warranty12–24 months

Best ForMost owners — best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£1,500–£3,000£2,100–£4,2001–6 monthsBudget priority; vehicle under £5,000

Reconditioned Engine£2,000–£4,500£2,800–£5,70012–24 monthsMost owners — best cost/warranty balance

Rebuilt Engine£3,500–£6,500£4,300–£7,70012–24 monthsLong‑term ownership; 3+ year horizon

Main Dealer New£8,000–£12,000£9,500–£14,00024–36 monthsInsurance jobs, warranty claims

Labour estimate: Fitting an A200 CDI engine typically takes 10–14 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer). Timing chain replacement on the OM651 is a labour‑intensive job requiring gearbox removal.

Common Problems

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Mercedes-Benz A200 CDI — 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-Benz A200 CDI — 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✅ Yes£1,500–£3,500If caught early; chain at rear makes it labour‑intensive but repairableInjector leak‑off pipes (OM640/OM651)✅ Yes£300–£800Replace leak‑off pipes; don't ignore diesel smellInjector failure (OM640/OM651)✅ Yes£400–£1,200Replace failed injectors; use updated partsEGR valve clogging (OM651)✅ Yes£300–£800Regular cleaning; use quality fuel and motorway runs to preventDPF clogging (OM651)✅ Yes£400–£1,200Preventative — regular motorway runs are the best preventionOM640 timing chain issues✅ Yes£800–£2,000Less common than OM651, but repairable if caught early

Buying This A200 CDI? Check These First

Buy If

Full Mercedes service history with documented oil changes
Evidence of timing chain work on OM651‑engined cars (W176)
W169 with the OM640 — generally the more robust engine
Good service history — the OM651 is unforgiving of neglect

Avoid If

Cold‑start rattle with no timing chain history — this is the single most important check on W176
Diesel smell from the engine bay — potential injector leak
DPF warning lights or regeneration issues with no diagnosis
Poor service history — the OM651 is sensitive to long oil change intervals

Closing Verdict

The A200 CDI badge spans two very different engines. The W169's OM640 is the more robust of the two — a cast‑iron block diesel that's reliable when maintained. The W176's OM651 is a refined but troublesome engine — timing chain stretch, injector failure, and EGR/DPF issues are all well‑documented. Buy the OM640 if you want reliability; buy the OM651 only with documented chain history.

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Buying Checklist

Before you buy a used Mercedes‑Benz A200 CDI (or before you commit to an engine replacement), check these:

Cold Start — Listen for rattling noise on startup (timing chain warning on OM651 — the most critical check)

Service History — Including which engine era (OM640 for W169 2004–2012, OM651 for W176 2012–2018) — see the Era Map above

Diesel Smell — Any strong diesel smell from the engine bay? Injector leak‑off pipe or injector failure indicator

Injector Pooling — Any diesel pooling near the injectors? Leak‑off pipe failure

DPF Status — Any DPF warning lights or regeneration issues?

EGR System — Any loss of power or black smoke? EGR clogging indicator

Engine Warning Light — Have codes been read? Any unresolved timing, injector, or emissions issues?

MOT History — Check for emissions‑related failures; often point to EGR, DPF, or injector problems

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

OM640.941

Years2004–2012

Power140 bhp / 300 Nm

2025 Enquiries— (pattern data)

Avg. Recon Cost£1,500–£3,500 [MB‑QUOTE]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

OM640.9412004–2012140 bhp / 300 Nm— (pattern data)£1,500–£3,500 [MB‑QUOTE]

OM651.9302012–2018136 bhp / 300 Nm— (pattern data)£2,500–£6,500 [MB‑QUOTE]

Technical Specs

OM651.930

Displacement1,991cc

Cylinders4‑cylinder inline

Bore × Stroke83.0 × 92.0 mm

Compression Ratio18.0:1

Fuel SystemCommon‑rail direct injection (1,600 bar)

BlockCast iron

ValvetrainDOHC, chain‑driven

Displacement1,796cc (early) / 2,143cc (later)

Cylinders4‑cylinder inline

Fuel SystemCommon‑rail direct injection

Market Intelligence

Most Common Failure

OM651 timing chain stretch — approximately 50% of OM651 enquiries; injector issues across both engines

[PATTERN DATA]

Average Enquiry Mileage

65,000

miles

[PATTERN DATA]

Average Replacement Cost

£3,500

reconditioned, supply only

[MB‑QUOTE]

Most Requested Engine Code

OM651.930

[MB‑VERIFIED]

Peak Enquiry Season

Winter — cold starts expose timing chain issues

[PATTERN DATA]

Regional Demand

London22%

South East20%

Midlands15%

PATTERN DATA

Regional Demand Breakdown

22%London

20%South East

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.

Find the best Mercedes‑Benz A200 CDI engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and get back on the road with confidence.

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No hidden fees

No Obligation

Get quotes with zero pressure

UK Specialists

20+ vetted experts

12-Month Warranty

As standard

Nationwide Delivery

Supply & fit available