Is the Mercedes E‑Class E200 / E220 diesel engine reliable?

It depends on which generation your E‑Class has. The OM651 (W212, 2009‑2016) is a 'very good engine if well maintained and looked after', but it has a well‑documented timing chain weakness. The OM646 (W211, 2002‑2009) is robust and features a Lanchester balancer shaft for smoothness. The OM611 (W210, 1998‑2002) is an early common‑rail diesel with a solid reputation. Regular oil changes (every 8,000‑10,000 miles) are essential for all three engines.

What are the common problems with the Mercedes E‑Class E200 / E220 diesel?

On the OM651 (W212), the most common issue is timing chain wear – causing rattling on cold start. On the OM611 and OM646 (W210/W211), the most common issues are fuel injector problems (rough idle, hard starting) and timing chain wear. All three engines can suffer from EGR valve and swirl flap issues. The OM651 has a known timing chain weakness at around 90,000 miles.

Is it worth replacing an E‑Class diesel engine, or should I scrap the car?

Depends on vehicle value and condition. Against a tidy £3,000–£10,000 E‑Class, a £1,800–£3,800 recon is 20‑60% of the car's value – often worth it on well‑maintained examples. If the timing chain has snapped on an OM651, a full engine replacement may be necessary. Get a full diagnostic assessment before committing.

How do I find my E‑Class's engine code?

The W210 (1998‑2002) uses the OM611.961 engine – a 2.2‑litre inline‑four. The W211 (2002‑2009) uses the OM646.951 (E200 CDI) or OM646.961 (E220 CDI) – a 2.2‑litre inline‑four. The W212 (2009‑2016) uses the OM651.911/.921/.951 – a 2.1‑litre inline‑four. The engine code is stamped on the engine block and listed on your V5C.

Mercedes E-Class E200/E220 Diesel1998–20163 Engine Families

Mercedes E-Class E200 / E220 Diesel Engine Replacement — Compare Prices & Get Quotes

Name: Mercedes E‑Class E200/E220 Diesel UK Engine Enquiry Data 2025
Creator: MercedesEngine.uk

Get quotes today from trusted UK Mercedes specialists. Compare reconditioned, rebuilt and used OM611, OM646 and OM651 diesel engines for the E-Class E200 and E220 CDI — the efficient, durable diesel engines that defined Mercedes' executive saloon for nearly two decades. Supply & fit available nationwide.

Supply & Fit Available

12‑Month Warranty

Nationwide Delivery

25+ Specialists

Supply & Fit Available

12‑Month Warranty

Nationwide Delivery

25+ Specialists

Mercedes E-Class E200/E220 Diesel Engines — from £800 to £3,436Common codes: OM611, OM646, OM651

Mercedes E-Class E200/E220 Diesel Engines — from £800 to £3,436· Common codes: OM611, OM646, OM651

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK‑Wide Network

Mercedes E-Class E200 / E220 Diesel — Which Engine Does Your Car Actually Have?

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

Era Note

102 PS, 235 Nm — early common‑rail diesel, robust but injector issues are common

GenerationYearsEngine CodeReliabilityRecon CostEra Note

W210 (E200 CDI) BMW 320d W210 (E200 CDI)

1998–2002OM611.961 (2.2L I4 Turbodiesel)★★★½☆ [NEWLY ASSIGNED — see Data Note]£1,800–£2,800 [PLACEHOLDER — confirm vs cost sheet]102 PS, 235 Nm — early common‑rail diesel, robust but injector issues are common

W210 (E220 CDI) BMW 320d W210 (E220 CDI)

1999–2002OM611.961 (2.2L I4 Turbodiesel)★★★½☆ [NEWLY ASSIGNED — see Data Note]£1,800–£3,000 [PLACEHOLDER — confirm vs cost sheet]125 PS, 300 Nm — higher‑tune OM611, same injector and chain concerns

W211 (E200 CDI) BMW 320d W211 (E200 CDI)

2002–2006OM646.951 (2.2L I4 Turbodiesel)★★★★☆ [NEWLY ASSIGNED — see Data Note]£2,000–£3,200 [PLACEHOLDER — confirm vs cost sheet]122 PS, 270 Nm — Lanchester balancer shaft for smoothness, robust OM646

W211 (E220 CDI) BMW 320d W211 (E220 CDI)

2002–2006OM646.961 (2.2L I4 Turbodiesel)★★★★☆ [NEWLY ASSIGNED — see Data Note]£2,000–£3,200 [PLACEHOLDER — confirm vs cost sheet]150 PS, 340 Nm — the refined OM646, balancer shaft smooth as a six‑cylinder

W211 (E200 CDI) BMW 320d W211 (E200 CDI)

2006–2009OM646.951 (2.2L I4 Turbodiesel)★★★★☆ [NEWLY ASSIGNED — see Data Note]£2,000–£3,200 [PLACEHOLDER — confirm vs cost sheet]136 PS, 320 Nm — late OM646, increased power, same reliability profile

W211 (E220 CDI) BMW 320d W211 (E220 CDI)

2006–2009OM646.961 (2.2L I4 Turbodiesel)★★★★☆ [NEWLY ASSIGNED — see Data Note]£2,000–£3,400 [PLACEHOLDER — confirm vs cost sheet]170 PS, 400 Nm — most powerful OM646, smooth and torquey

W212 (E200 CDI) BMW 320d W212 (E200 CDI)

2009–2013OM651.921 (2.1L I4 Turbodiesel)★★★☆☆ [NEWLY ASSIGNED — see Data Note]£2,200–£3,436 [PLACEHOLDER — confirm vs cost sheet]136 PS, 350 Nm — OM651, timing chain wear is the defining weakness

W212 (E220 CDI) BMW 320d W212 (E220 CDI)

2009–2013OM651.911 (2.1L I4 Turbodiesel)★★★☆☆ [NEWLY ASSIGNED — see Data Note]£2,400–£3,600 [PLACEHOLDER — confirm vs cost sheet]163 PS, 400 Nm — OM651 twin‑turbo, chain and injector concerns

W212 (E200 CDI) BMW 320d W212 (E200 CDI)

2013–2016OM651.951 (2.1L I4 Turbodiesel)★★★☆☆ [NEWLY ASSIGNED — see Data Note]£2,200–£3,500 [PLACEHOLDER — confirm vs cost sheet]136 PS, 360 Nm — late OM651, revised injectors, chain remains a concern

W212 (E220 CDI) BMW 320d W212 (E220 CDI)

2013–2016OM651.951 (2.1L I4 Turbodiesel)★★★☆☆ [NEWLY ASSIGNED — see Data Note]£2,400–£3,800 [PLACEHOLDER — confirm vs cost sheet]170 PS, 400 Nm — final OM651, most powerful E220 CDI

Why use this era map?

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

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

Mercedes E-Class E200 / E220 Diesel Engine Replacement Costs

Supply Only£1,800–£3,200

Fitted (Indie)£2,800–£4,500

Warranty12–24 months

Best ForMost owners — best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£800–£1,800£1,400–£2,8001–6 monthsBudget priority; short‑term ownership

Reconditioned Engine£1,800–£3,200£2,800–£4,50012–24 monthsMost owners — best cost/warranty balance

Rebuilt Engine£2,800–£3,800£3,800–£5,20012–24 monthsLong‑term ownership; maximum reliability

Main Dealer NewN/A (NLA for older engines)N/AN/AOM611/OM646 no longer available new; OM651 limited availability

Figures above reflect the E-Class diesel pricing across generations. A reconditioned engine typically costs £1,200–£2,200, with total installed cost around £1,800–£2,800. A new OEM engine replacement can cost £2,500–£4,000+, with labour pushing the total above £5,000. The OM651 is at the upper end of the range. For reference, a timing chain and tensioner replacement on an OM651 is around £700 at a good independent specialist.

Labour estimate: Fitting an E-Class diesel engine typically takes 10‑14 hours at £75‑£110/hr (independent Mercedes specialist). The OM651 is more tightly packaged than the earlier OM646 and OM611, adding some complexity. A timing chain replacement on the OM651 is considered "not a huge job to replace".

→ Compare E-Class diesel engine prices from UK specialists

Common Problems

1. OM651 Timing Chain Wear (W212, 2009–2016)

Symptoms: Rattling noise on cold start (especially noticeable when cold), metallic ticking, rattling persisting when warm, engine warning light, rough running. The timing chain is a known weak point on the OM651. A noisy chain at 160,000 miles is "asking for trouble if not sorted".

Typical mileage: 90,000–160,000 miles. Many owners report noise around 90,000 miles.

Repair cost: £700–£1,500 [PLACEHOLDER] (timing chain and tensioner replacement — a known weak spot but "really isn't the end of the world compared to some cars issues").

Replacement cost: £2,200–£3,800 [PLACEHOLDER] (if chain snaps or jumps and damages the engine).

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

Our recommendation:

The OM651 timing chain is the defining weakness of the W212 E-Class diesel. The stop‑start system is often blamed for causing additional stress to the chain. A timing chain and tensioner replacement is around £700 at a good independent specialist. Excessive use of the Mercedes stop‑start system is usually blamed for this. If the chain breaks or becomes loose enough to jump on the sprockets, the engine will be damaged — "such damage that might need the head to come off to rectify and that's going to be very expensive". At the first sign of cold‑start rattle, have the timing system inspected immediately.

1. OM651 Timing Chain Wear (W212, 2009–2016)

Typical mileage: 90,000–160,000 miles. Many owners report noise around 90,000 miles.

Repair cost: £700–£1,500 [PLACEHOLDER] (timing chain and tensioner replacement — a known weak spot but "really isn't the end of the world compared to some cars issues").

Replacement cost: £2,200–£3,800 [PLACEHOLDER] (if chain snaps or jumps and damages the engine).

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

Our recommendation:

2. OM611 / OM646 Fuel Injector Issues (W210 & W211)

Symptoms: Rough idle, hard starting, misfires, poor fuel economy, engine warning light, black smoke from exhaust, engine stalling.

Typical mileage: 80,000–150,000 miles.

Repair cost: £300–£800 [PLACEHOLDER] (injector cleaning or replacement — remanufactured Bosch injectors available from around £165.84).

Replacement cost: N/A — repair only.

🟠 Check - book inspection urgently if rough running or hard starting occurs.

Our recommendation:

The OM611 and OM646 are known for fuel injector issues. The Bosch common‑rail system is generally reliable, but injectors can suffer from wear and clogging over time. Remanufactured Bosch exchange diesel injectors are available from around £165.84. If the engine runs rough or has starting issues, have the injectors tested for leak‑off. Regular use of quality diesel and occasional fuel system cleaner can help prevent injector issues.

3. OM651 Injector & Fuel System Issues (W212)

Symptoms: Rough idle, misfires, hard starting, poor fuel economy, engine warning light, black smoke from exhaust.

Typical mileage: 60,000–120,000 miles.

Repair cost: £400–£1,200 [PLACEHOLDER] (injector cleaning or replacement).

Replacement cost: N/A — repair only.

🟠 Check - book inspection urgently if rough running or hard starting occurs.

Our recommendation:

The OM651's fuel injectors can suffer from wear and clogging. Injector issues can cause rough running, hard starting, and poor fuel economy. Regular fuel filter changes and using high‑quality diesel are essential. If the engine runs rough or has starting issues, have the injectors tested for leak‑off.

4. OM611 / OM646 Camshaft & Timing Chain Wear (W210 & W211)

Symptoms: Rattling noise from the engine on start‑up, metallic ticking, loss of power, rough running, engine warning light.

Typical mileage: 150,000–200,000 miles.

Repair cost: £800–£2,000 [PLACEHOLDER] (timing chain, guides, and tensioner replacement).

Replacement cost: £1,800–£3,400 [PLACEHOLDER] (if chain snaps or jumps).

🔴 Immediate - if you hear rattling on start‑up, book an inspection immediately.

Our recommendation:

The OM611 and OM646 timing chains can stretch over time, and the camshaft can wear. The chain typically requires replacement after 160,000‑200,000 km. Using the incorrect engine oil grade is a major cause of timing chain issues. At the first sign of rattling, have the timing system inspected immediately.

5. OM651 EGR Valve & Swirl Flap Issues (W212)

Symptoms: Reduced power, rough idle, increased fuel consumption, engine warning light, black smoke from exhaust.

Typical mileage: 60,000–100,000 miles.

Repair cost: £300–£800 [PLACEHOLDER] (EGR valve cleaning or replacement).

Replacement cost: N/A — repair only.

🟡 Monitor - book inspection soon if symptoms develop.

Our recommendation:

The OM651's EGR valve can become clogged with soot over time. This can lead to reduced power, rough idle, and increased fuel consumption. Regular motorway driving and using high‑quality diesel can help reduce EGR clogging. Swirl flap issues in the intake manifold can also occur. If the engine warning light appears with EGR‑related codes, have the system diagnosed promptly.

Weighing Your Options?

Compare Specialist Quotes When You're Ready

25+ vetted Mercedes specialists, covering the OM611, OM646 and OM651 engines across the E200 and E220 CDI, with a 12‑month warranty as standard.

See E-Class Diesel Engine Options

Mercedes E-Class E200 / E220 Diesel — 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 E-Class E200 / E220 Diesel — 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 wear (W212)✅ Yes (if caught early)£700–£1,500 [PLACEHOLDER]Catch it early — a known weak spot but "not the end of the world"OM651 timing chain snapped❌ Usually No£2,200–£3,800+Full engine replacement — head damage is likelyOM611/OM646 timing chain wear✅ Yes (if caught early)£800–£2,000 [PLACEHOLDER]Catch it early — cheaper than engine replacementFuel injector issues (all engines)✅ Yes£300–£800 [PLACEHOLDER]Worth fixing — common and well‑understood repairOM651 EGR / swirl flap issues✅ Yes£300–£800 [PLACEHOLDER]Worth fixing — routine maintenance itemMajor internal failure (any engine)❌ Usually No£1,800–£3,800+Full engine replacement often more cost‑effective

Buying This Mercedes E-Class Diesel? Check These First

Buy If

Full Mercedes service history with regular oil changes (every 8,000‑10,000 miles)
W212 (OM651): Timing chain quiet — no rattling on cold start
W211 (OM646): Smooth running — balancer shaft engines are "as smooth as a six‑cylinder"
W210 (OM611): Injectors in good health — no hard starting or rough idle
A well‑maintained example — the OM651 is a "very good engine if well maintained and looked after"

Avoid If

W212 (OM651): Any sign of cold‑start rattle — timing chain warning
W210 (OM611): Any sign of injector issues — hard starting or rough idle
W211 (OM646): Any sign of timing chain rattle — the OM646 is robust but not immune
Poor service history — these engines are intolerant of neglect

Closing Verdict

The Mercedes E-Class E200 and E220 diesel models represent three generations of some of the finest diesel engines Mercedes ever produced. The OM611 in the W210 (1998‑2002) was an early common‑rail diesel with a solid reputation. The OM646 in the W211 (2002‑2009) featured a Lanchester balancer shaft, making it "as smooth as a six‑cylinder". The OM651 in the W212 (2009‑2016) is the most‑produced engine in Mercedes‑Benz history — a "very good engine if well maintained and looked after", but it has a well‑documented timing chain weakness. Buy on service history above all else — a well‑maintained E-Class diesel is a rewarding and reliable car; a neglected example can be expensive to repair.

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

→ Compare E-Class diesel 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 E-Class diesel engine prices before you buy

20+ Vetted Specialists UK Network

12-Month Warranty as Standard

Nationwide Delivery & Collection

Transparent Pricing, No Hidden Fees

Thousands of 320d Owners Helped

Buying Checklist

Before you buy a used Mercedes E-Class E200 / E220 diesel (or before you commit to an engine replacement), check these:

1. Cold Start — Any rattling? (timing chain warning — W212 OM651 especially)

2. Service History — Regular oil changes (every 8,000‑10,000 miles) — this is non‑negotiable

3. Injector Health — Any hard starting, rough idle, or misfires? (injector warning)

4. Timing Chain History — Has the chain been inspected or replaced? (especially OM651)

5. Running Quality — Any loss of power or hesitation? (EGR or swirl flap warning)

6. Oil Leaks — Check under the vehicle and around the engine for any signs of leakage

7. Oil Consumption — Does it use more than 1L per 1,000 miles?

8. MOT History — Check for emissions‑related failures or any advisory notes

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.

OM611.961 (2.2L I4 Turbodiesel)

Years1998–2002

Power102‑125 PS (75‑92 kW) / 235‑300 Nm

2025 Enquiries— (pattern data)

Avg. Recon Cost£1,800–£3,000 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

OM611.961 (2.2L I4 Turbodiesel)1998–2002102‑125 PS (75‑92 kW) / 235‑300 Nm— (pattern data)£1,800–£3,000 [PLACEHOLDER]

OM646.951 / .961 (2.2L I4 Turbodiesel)2002–2009122‑170 PS (90‑125 kW) / 270‑400 Nm— (pattern data)£2,000–£3,400 [PLACEHOLDER]

OM651.911 / .921 / .951 (2.1L I4 Turbodiesel)2009–2016136‑170 PS (100‑125 kW) / 350‑400 Nm— (pattern data)£2,200–£3,800 [PLACEHOLDER]

Technical Specs

OM651 — 2.1L Inline‑4 Turbodiesel

Displacement2,148 cc

Cylinders4‑cylinder inline

Fuel SystemCommon‑rail direct injection

AspirationTurbocharged

Displacement2,148 cc

Cylinders4‑cylinder inline

Fuel SystemCommon‑rail direct injection

AspirationTurbocharged

Special FeatureLanchester balancer shaft for smoothness

Displacement2,143 cc

Cylinders4‑cylinder inline

Bore x Stroke83 mm x 99 mm

Block MaterialCast iron

Head MaterialAluminium alloy

ValvetrainDOHC, chain‑driven

Compression Ratio16.2:1

Fuel SystemCommon‑rail

AspirationSingle turbo / twin‑turbo

Power Range107–201 hp (80–150 kW)

→ Compare E-Class diesel engine prices for your Mercedes

Get quotes from trusted UK specialists in minutes.

Market Intelligence

Most Common Failure

OM651: Timing chain wear (W212) — OM611/OM646: Injector issues

Average Enquiry Mileage

80,000

–120,000 miles

[PATTERN DATA]

Average Replacement Cost

£2,500

reconditioned, supply only

[PLACEHOLDER]

Most Requested Engine Code

OM651 — the W212 is the most common on the used market

[PATTERN DATA]

Peak Enquiry Season

Autumn/Winter — cold starts expose timing chain and injector issues

[PATTERN DATA]

Regional Demand

South East22%

London16%

South West (12%) — executive saloon strongholds

PATTERN DATA

Regional Demand Breakdown

22%South East

16%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.

Why UK Mercedes E-Class Diesel Owners Trust MercedesEngine.uk

Trusted E-Class Diesel Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real E‑Class owners, as part of the Engine Finders network, covering the OM611, OM646 and OM651 diesel engines across three generations of the E200 and E220 CDI.
Compare E-Class Diesel Engine Replacement Companies
see prices, warranty terms and supply & fit options side‑by‑side before you commit, with specialists who understand the OM651's timing chain vulnerabilities, the OM611/OM646's injector issues, and the importance of regular oil changes.
UK Engine Replacement Services for the E‑Class
supply‑only or full supply & fit available nationwide, covering the W210, W211 and W212 generations of the E200 and E220 diesel, with specialist knowledge of Mercedes' most‑produced diesel engines.

Find the best Mercedes E‑Class E200 / E220 diesel engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and get back on the road with confidence.

Explore Mercedes E‑Class Diesel Engine Quotes

100% Free

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

100% Free

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