How much does a Mercedes C220 CDI / C220d engine replacement cost in the UK?

A reconditioned C220 engine typically costs £1,500–£4,500 supply only depending on generation. Fitting adds £1,500–£2,500 depending on location and workshop rates. A replacement OM646 engine costs on average £2,160 in good condition, with a new or reconditioned engine costing up to £3,038. A replacement OM651 timing chain and tensioner costs around £700–£900. Use our calculator for a figure specific to your car.

Is the Mercedes C220 CDI / C220d engine reliable?

It depends entirely on which engine generation your C220 has. The OM611 and OM646 (1997–2008) are widely regarded as 'bulletproof' diesels — 'will likely run forever'. The OM651 (2008–2018) has a known timing chain tensioner weakness — a £700 fix at a good indie. The OM654 (2018–present) has early reports of injector seal leaks and timing chain wear. Check the Era Map above for your specific car.

What are the common problems with the Mercedes C220 CDI / C220d?

Injector 'black death' on OM611/OM646 engines — diesel leaks past injector seals and carbonises into black tar, timing chain tensioner wear on OM651 engines — causing cold-start rattle, turbocharger and boost pressure issues across all generations, and AdBlue system failures on OM651/OM654 (W205/W206).

Is it worth replacing a Mercedes C220 CDI / C220d engine, or should I scrap the car?

Depends on vehicle value and condition. Against a well-kept £3,000–£12,000 C-Class, a £2,500–£4,500 recon is 25–150% of the car's value. For a clean pre-2008 OM646 example, replacement is almost always worth it given the engine's legendary durability. For OM651 examples with documented chain work, replacement is viable. For examples under £2,000, the replacement cost may exceed our 70% Mercedes threshold — get a scrap valuation first.

How do I find my Mercedes C220 CDI / C220d engine code?

Listed on the VIN plate and vehicle documentation. As a rule of thumb: W202/W203 (1997–2004) have OM611, W203 facelift/W204 early (2004–2008) have OM646, W204/W205 (2008–2018) have OM651, W205 facelift/W206 (2018–present) have OM654. Tell us your registration date and we'll confirm it for free.

Can I repair the OM651 timing chain, or does it need replacement?

Yes — if caught early. A timing chain and tensioner replacement costs around £700–£900 at a good indie. Some owners have reported changing just the tensioner twice at high mileages without replacing the whole chain set. At the first sign of cold-start rattle, book an inspection immediately. If the chain snaps, a full engine replacement is usually the only option.

Mercedes C220 CDI / C220d1997–present4 Engine Generations (OM611, OM646, OM651 & OM654)

Mercedes C220 CDI / C220d Engine Replacement — Compare Prices & Get Quotes

Name: Mercedes C220 CDI/C220d UK Engine Enquiry Data 2025
Creator: MercedesEngine.uk

Get quotes today from trusted UK Mercedes C-Class specialists. The C220 badge spans four diesel engine generations across seven model years — compare reconditioned, rebuilt and used OM611, OM646, OM651 and OM654 engines with supply & fit available nationwide.

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Mercedes C220 CDI / C220d Engines — from £800 to £8,500Common codes: OM611, OM646, OM651, OM654

Mercedes C220 CDI / C220d Engines — from £800 to £8,500· Common codes: OM611, OM646, OM651, OM654

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Mercedes C220 CDI / C220d — Which Engine Does Your Car Actually Have?

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

Era Note

2.1L four-cylinder — 125 hp. Early CDI, simple and robust. Injector "black death" is the main weak point

GenerationYearsEngine CodeReliabilityRecon CostEra Note

W202

1997–2000OM611★★★★☆ [MB-VERIFIED — inherited]£1,500–£3,500 [PLACEHOLDER]2.1L four-cylinder — 125 hp. Early CDI, simple and robust. Injector "black death" is the main weak point

W203

2000–2004OM611★★★★☆ [MB-VERIFIED — inherited]£1,500–£3,500 [PLACEHOLDER]2.1L four-cylinder — 143 hp. Same robust OM611; injector seal failures and turbo vanes are known issues

W203 facelift / W204 early BMW 320d W203 facelift / W204 early

2004–2008OM646★★★★☆ [MB-VERIFIED — inherited]£1,800–£4,000 [PLACEHOLDER]2.1L four-cylinder — 150–170 hp. Bulletproof without DPF, "likely to run forever"

W204

2008–2014OM651★★★☆☆ [NEWLY ASSIGNED — see Data Note]£2,000–£4,500 [PLACEHOLDER]2.1L four-cylinder — 170–204 hp. Timing chain tensioner wear is a known weakness

W205

2014–2018OM651★★★☆☆ [NEWLY ASSIGNED — see Data Note]£2,000–£4,500 [PLACEHOLDER]Same OM651; injector and timing chain issues documented

W205 facelift BMW 320d W205 facelift

2018–2021OM654★★★☆☆ [NEWLY ASSIGNED — see Data Note]£3,500–£6,500 [PLACEHOLDER]2.0L four-cylinder — 194 hp. Early OM654 with injector and timing chain concerns

W206

2021–presentOM654★★★☆☆ [NEWLY ASSIGNED — see Data Note]£3,500–£6,500 [PLACEHOLDER]2.0L four-cylinder with mild hybrid — 197–200 hp. Revised OM654, still emerging reliability data

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 C220 CDI / C220d Engine Replacement Costs

Supply Only£1,500–£4,500

Fitted (Indie)£3,000–£6,000

Warranty12–24 months

Best ForMost owners — best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£800–£1,800£1,500–£3,0001–6 monthsBudget priority; donor for rebuild

Reconditioned Engine£1,500–£4,500£3,000–£6,00012–24 monthsMost owners — best cost/warranty balance

Rebuilt Engine£2,500–£6,500£4,500–£8,00012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer New£9,000–£15,000+£11,000–£17,000+24–36 monthsInsurance jobs, warranty claims

Labour estimate: Fitting a C220 engine typically takes 10–14 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer). OM651 timing chain replacement is a significant job — some specialists quote around £700–£900.

→ Compare C220 CDI / C220d engine prices from UK specialists

Common Problems

1. Injector "Black Death" (OM611 & OM646, W202 & W203)

Symptoms: Diesel/exhaust smell in the cabin, ticking or chuffing noise from the engine bay, black tar-like residue around injector bases, rough idle, hard starting

Typical mileage: 60,000–120,000 miles

Repair cost: £200–£600 (injector seal replacement and cleaning)

Replacement cost: N/A — repair only (does not progress to engine replacement if addressed)

🟠 Check - book inspection urgently if you smell diesel or hear chuffing

Our recommendation:

"Black death" is a well-known issue on Mercedes CDI engines, particularly the OM611 and OM646. It occurs when the copper washer seal at the base of an injector fails, allowing combustion gases and diesel to escape. The escaping gases carbonise into a sticky black tar-like substance that is incredibly difficult to remove. If you smell diesel in the cabin or hear a chuffing noise from the engine, have the injector seals inspected immediately. A £200–£600 repair is far cheaper than the damage that can occur if left unaddressed.

Read the full injector "black death" guide → /failures/injector-black-death/ [NEW FAILURE PAGE NEEDED]

1. Injector "Black Death" (OM611 & OM646, W202 & W203)

Symptoms: Diesel/exhaust smell in the cabin, ticking or chuffing noise from the engine bay, black tar-like residue around injector bases, rough idle, hard starting

Typical mileage: 60,000–120,000 miles

Repair cost: £200–£600 (injector seal replacement and cleaning)

Replacement cost: N/A — repair only (does not progress to engine replacement if addressed)

🟠 Check - book inspection urgently if you smell diesel or hear chuffing

Our recommendation:

Read the full injector "black death" guide → /failures/injector-black-death/ [NEW FAILURE PAGE NEEDED]

2. Timing Chain Tensioner Wear (OM651, W204 & W205)

Symptoms: Rattling or slapping noise from the engine on cold start, especially after the car has been sitting, metallic ticking that subsides as oil pressure builds

Typical mileage: 80,000–120,000 miles — can occur from 90,000 miles

Repair cost: £700–£1,000 (timing chain and tensioner replacement)

Replacement cost: £4,500–£8,000 (if chain snaps — full engine replacement)

🔴 Immediate - if you hear rattling on cold start, book an inspection today

Our recommendation:

The OM651 timing chain is a known weak spot. A timing chain and tensioner replacement is around £700 at a good indie, "its a known weak spot on the OM651 but really isn't the end of the world compared to some cars issues". Some owners have reported changing the tensioner twice — first at 290,000 km and again at 390,000 km — without needing to replace the whole chain set. At the first sign of cold-start rattle, get the tensioner inspected immediately. A £700–£1,000 preventative repair is dramatically cheaper than a £4,500–£8,000 engine replacement.

Read the full timing chain failure guide → /failures/om651-timing-chain/ [NEW FAILURE PAGE NEEDED]

3. Turbocharger & Boost Pressure Issues (All Generations)

Symptoms: Loss of power, limp mode (engine won't rev above 3,000 rpm), whistling or siren-like noise, black smoke, engine warning light

Typical mileage: 60,000–120,000 miles

Repair cost: £800–£2,500 (turbocharger rebuild or replacement; boost hose repair)

Replacement cost: £4,500–£8,000 (if ignored — full engine replacement)

🟠 Check - book inspection urgently if you experience power loss or hear whistling

Our recommendation:

Turbocharger and boost pressure issues are common across all C220 generations. Common causes include jammed turbo vanes, blocked EGR valves, leaking boost hoses, and faulty boost pressure sensors. A leaking boost hose is "a common problem on this car". If you experience power loss or limp mode, have the turbo system and boost hoses inspected immediately. A £800–£2,500 repair is far cheaper than the engine damage that can follow if ignored.

Read the full turbo failure guide

4. AdBlue & SCR System Issues (OM651 & OM654, W205 & W206)

Symptoms: "Starts not possible in XXX miles" countdown warning, engine management light, reduced power, AdBlue warning messages

Typical mileage: Any mileage — AdBlue system issues are common on modern Mercedes diesels

Repair cost: £300–£1,500 (AdBlue system diagnosis and repair)

Replacement cost: N/A — repair only (does not progress to engine replacement if addressed)

🟠 Check - book inspection urgently if countdown warning appears

Our recommendation:

On Mercedes OM651 and OM654 diesel engines, AdBlue faults are rarely caused by a single failed part. Common symptoms include countdown warnings and engine management lights. AdBlue issues can be "difficult to diagnose and expensive to fix". If you see an AdBlue warning or countdown, take the car to a trusted independent specialist with genuine MB STAR diagnostic equipment. Generic OBDII scanners won't help here.

Read the full AdBlue system failure guide → /failures/adblue-system-failure/ [NEW FAILURE PAGE NEEDED]

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C220 CDI / C220d — 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.

C220 CDI / C220d — 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 SenseInjector "black death" (OM611/OM646)✅ Yes£200–£600Straightforward seal replacement — catch earlyTiming chain rattle (OM651, early detection)✅ Yes£700–£1,000Preventative — tensioner replacement is a known fixTiming chain snapped (OM651)❌ Usually NoEngine replacementFull engine replacement is the only reliable fixTurbo / boost pressure issues✅ Yes£800–£2,500Catch early to prevent engine damageAdBlue system failure✅ Yes£300–£1,500Specialist diagnosis and repair required

Buying This C220 CDI / C220d? Check These First

Buy If

Pre-2008 OM646-engined car (no DPF, bulletproof reliability) — "will likely run forever"
Documented timing chain work on any OM651-engined car (2008–2018)
Full service history with regular oil changes — the OM651 is unforgiving of neglect
Clean injector bases with no black residue (OM611/OM646)

Avoid If

OM651-engined car with cold-start rattle and no timing chain history — this is a ticking time bomb
OM611/OM646 with injector "black death" and no documented repair
Poor service history — diesel Mercedes are reliable but need proper maintenance
AdBlue countdown warnings with no diagnosis

Closing Verdict

The C220 CDI/C220d badge spans four very different diesel engine generations. The OM611 and OM646 (1997–2008) are widely regarded as "bulletproof" diesels — simple, robust and "likely to run forever". The OM651 (2008–2018) introduced timing chain tensioner wear as a known weakness — a £700 fix at a good indie. The OM654 (2018–present) has early reports of injector and timing chain concerns. Buy a pre-2008 OM646 if you want the most durable option. Buy a well-maintained OM651 with documented chain work if you want newer refinement. Buy on documented history, not on generation alone.

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

→ Compare C220 CDI / C220d engine prices before you buy

Don't Guess. Compare.

Get real quotes from vetted UK specialists and make the right call for your 320d.

→ Compare C220 CDI / C220d engine prices before you buy

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Buying Checklist

Before you buy a used Mercedes C220 CDI or C220d (or before you commit to an engine replacement), check these:

Cold Start — Listen for rattling or slapping noise (timing chain tensioner warning — OM651 critical)

Injector Bases — Remove engine cover and check for black tar-like residue ("black death" — OM611/OM646)

Service History — Including which engine era (OM611, OM646, OM651 or OM654) and confirmed oil-interval discipline

Turbo Health — Listen for whistling; check for power loss or limp mode

AdBlue System — Any countdown warnings or engine management lights? (W205/W206 OM651/OM654)

DPF Health — Check for DPF warning lights; short journeys are a red flag (post-2008 models)

Engine Warning Light — Have codes been read? Look for timing, injector or boost-related codes

MOT History — Check for emissions-related failures

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 match Section 1B's Era Map exactly.

OM611

Years1997–2004

Power125–143 hp (92–105 kW) / 300–315 Nm

2025 Enquiries— (pattern data)

Avg. Recon Cost£1,500–£3,500【PLACEHOLDER】

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

OM6111997–2004125–143 hp (92–105 kW) / 300–315 Nm— (pattern data)£1,500–£3,500【PLACEHOLDER】

OM6462004–2008150–170 hp (110–125 kW) / 340–400 Nm— (pattern data)£1,800–£4,000【PLACEHOLDER】

OM6512008–2018170–204 hp (125–150 kW) / 400–500 Nm1,250【MB-VERIFIED】£2,000–£4,500【PLACEHOLDER】

OM6542018–present194–200 hp (143–147 kW) / 400–440 Nm— (pattern data)£3,500–£6,500【PLACEHOLDER】

Technical Specs

OM654 — current generation

Displacement1,950 cc (2.0L)

Cylinders4-cylinder inline

Bore82.0 mm / Stroke: 92.3 mm

Compression Ratio15.5:1

Fuel SystemCommon-rail direct injection

TurbochargerSingle turbo with variable geometry

ValvetrainDOHC, 4 valves per cylinder, chain-driven

Mild Hybrid48V system on W206 models

→ Compare C220 CDI / C220d engine prices for your Mercedes

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Market Intelligence

Most Common Failure

Injector "black death" on OM611/OM646; timing chain tensioner wear on OM651

Average Enquiry Mileage

60,000

–120,000 miles【PATTERN DATA】

Average Replacement Cost

£2,500

–£4,500 reconditioned, supply only【PLACEHOLDER】

Most Requested Engine Code

OM651【PATTERN DATA】

Peak Enquiry Season

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

Regional Demand

London22%

South East18%

North West (12%)【PATTERN DATA】

Regional Demand Breakdown

22%London

18%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.

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