How much does a Mercedes CL203 engine replacement cost in the UK?

A reconditioned CL203 engine typically costs £1,200–£7,500 supply only, depending on engine — the volume C200 CDI diesel sits at £2,500–£4,200. Fitting adds £600–£1,400. Use our calculator for a personalised figure.

Which Mercedes CL203 engine is the most reliable?

The post-2005 C320 CDI (OM642 V6 diesel) is the most dependable CL203 engine — smooth, refined and robust with few major failure modes beyond the well-documented oil cooler seal leak. The M111 supercharged engines in pre-facelift cars (C180/C230 Kompressor) are also solid, though older.

What are the common problems with the Mercedes CL203?

The M271 four-cylinder petrols suffer from timing chain and camshaft adjuster wear (45k–90k miles). Diesel OM611/OM612 engines suffer injector seal failure ("Black Death"). Early M272 V6 petrols have balance shaft sprocket wear. The C32 AMG's intercooler pump is a known weak point. Rust is also a significant bodywork concern.

Is the Mercedes CL203 reliable?

It depends heavily on engine choice and maintenance history. The OM642 diesel and M111 petrols are the most robust. M271-engined cars carry a significant timing chain risk. The C32 AMG and C55 AMG are reliable for performance cars but have high running costs. Always check service history and rust.

Which Mercedes CL203 engine should I avoid?

The M271 (C160/C180/C200 Kompressor) without documented timing chain history is the one to avoid — chain and cam adjuster failure can occur from 45,000 miles and is expensive to fix. The early M272 C350 (pre-2008) also carries balance shaft risk. The C30 CDI AMG is collectible but parts are scarce.

How do I know if my CL203 engine needs replacing?

Cold-start rattle (M271 timing chain), black carbon residue around injectors (OM611/OM612 diesel), or a flashing engine management light and rough running (M272 balance shaft) are the key warnings. Blue smoke, rough idle or sudden loss of power on any engine also warrant immediate inspection.

Is it worth replacing a Mercedes CL203 engine, or should I scrap the car?

Depends on the car's value. Against a well-kept £7,000 C320 CDI, a £3,500–£6,000 recon is 50–85% of the car's value — marginal but sometimes worth it. Against a tired £3,000 example, the same recon is 117–200% — walk away. Our 70% Mercedes threshold is the line.

How long do Mercedes CL203 engines last?

The OM642 V6 diesel can exceed 200,000 miles with proper servicing and oil cooler maintenance. The M111 petrols can reach 150,000+ miles. The M271's life is limited by the timing chain; addressed proactively, it can also reach high mileages. The CL203's rust issues often end the car's life before the engine.

What is the difference between the CL203 and the W203 C-Class?

The CL203 is the SportCoupé (three-door hatchback) version of the W203 C-Class (four-door saloon and estate). Both share the same platform, engines and mechanicals. The CL203 was produced from 2000 to 2008 (then rebadged as the CLC until 2011), while the W203 saloon ran to 2007. Engine costs are identical; body-specific parts differ.

How do I find my Mercedes CL203 engine code?

Listed on the VIN plate (visible through the windscreen, lower passenger side), stamped on the engine block, and detailed in your vehicle registration documents (V5C). Tell us your variant (C180 Kompressor, C320 CDI, etc.) and approximate registration date, and we'll confirm it — 25+ vetted Mercedes specialists will verify it for free.

Mercedes C-Class CL203 Engines — The Complete UK Guide

Mercedes C-Class CL203 Engine Codes — The Complete Database

Every engine fitted to the CL203 SportCoupé specifically — from the early M111 to the later M271 and the V6 options that made this coupé a genuine alternative to the saloon.

Engine CodeFamilyFuelDisplacementPowerYears (CL203)Variants (badges)Reliability2025 EnquiriesAvg. Recon Cost

M111.951M111Petrol, supercharged2.0L (1998cc)129 bhp (95 kW)2000–2004C180 Kompressor★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£1,200–£2,500 [MB-QUOTE]

M111.981M111Petrol, supercharged2.3L (2295cc)197 bhp (145 kW)2000–2004C230 Kompressor★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£1,800–£3,500 [MB-QUOTE]

M271.921M271Petrol, supercharged1.8L (1796cc)122 bhp (90 kW)2004–2008C160 Kompressor★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£1,500–£2,800 [MB-QUOTE]

M271.946M271Petrol, supercharged1.8L (1796cc)143 bhp (105 kW)2004–2008C180 Kompressor★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£1,500–£2,800 [MB-QUOTE]

M271.948M271Petrol, supercharged1.8L (1796cc)163 bhp (120 kW)2004–2008C200 Kompressor★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£1,800–£3,200 [MB-QUOTE]

M271.950M271Petrol, turbocharged1.8L (1796cc)184 bhp (135 kW)2008–2011CLC 180 Kompressor★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£1,800–£3,500 [MB-QUOTE]

M112.961M112Petrol, supercharged V63.2L (3199cc)354 bhp (260 kW)2002–2008C32 AMG Kompressor★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£4,000–£7,500 [MB-QUOTE]

M272.960M272Petrol V63.5L (3498cc)272 bhp (200 kW)2005–2008C350★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£3,500–£6,000 [MB-QUOTE]

M113.944M113Petrol V85.4L (5439cc)367 bhp (270 kW)2004–2007C55 AMG★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£5,000–£9,000 [MB-QUOTE]

OM611.962OM611Diesel I42.1L (2148cc)122–143 bhp (90–105 kW)2000–2004C200 CDI, C220 CDI★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£2,500–£4,200 [MB-QUOTE]

OM612.990OM612Diesel I52.7L (2688cc)170 bhp (125 kW)2002–2005C270 CDI★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£3,200–£5,500 [MB-QUOTE]

OM612.967OM612Diesel I53.0L (2950cc)231 bhp (170 kW)2002–2004C30 CDI AMG★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£4,500–£7,000 [MB-QUOTE]

OM642.960OM642Diesel V63.0L (2987cc)224 bhp (165 kW)2005–2008C320 CDI★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£3,500–£6,000 [MB-QUOTE]

Engine CodeFuelPowerYearsReliabilityEnquiriesAvg. Recon Cost

M111.951M111Petrol, supercharged129 bhp (95 kW)2000–2004★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£1,200–£2,500 [MB-QUOTE]

M111.981M111Petrol, supercharged197 bhp (145 kW)2000–2004★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£1,800–£3,500 [MB-QUOTE]

M271.921M271Petrol, supercharged122 bhp (90 kW)2004–2008★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£1,500–£2,800 [MB-QUOTE]

M271.946M271Petrol, supercharged143 bhp (105 kW)2004–2008★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£1,500–£2,800 [MB-QUOTE]

M271.948M271Petrol, supercharged163 bhp (120 kW)2004–2008★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£1,800–£3,200 [MB-QUOTE]

M271.950M271Petrol, turbocharged184 bhp (135 kW)2008–2011★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£1,800–£3,500 [MB-QUOTE]

M112.961M112Petrol, supercharged V6354 bhp (260 kW)2002–2008★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£4,000–£7,500 [MB-QUOTE]

M272.960M272Petrol V6272 bhp (200 kW)2005–2008★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£3,500–£6,000 [MB-QUOTE]

M113.944M113Petrol V8367 bhp (270 kW)2004–2007★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£5,000–£9,000 [MB-QUOTE]

OM611.962OM611Diesel I4122–143 bhp (90–105 kW)2000–2004★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£2,500–£4,200 [MB-QUOTE]

OM612.990OM612Diesel I5170 bhp (125 kW)2002–2005★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£3,200–£5,500 [MB-QUOTE]

OM612.967OM612Diesel I5231 bhp (170 kW)2002–2004★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£4,500–£7,000 [MB-QUOTE]

OM642.960OM642Diesel V6224 bhp (165 kW)2005–2008★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£3,500–£6,000 [MB-QUOTE]

Overview

Mercedes C-Class CL203 — Overview

The Mercedes-Benz C-Class SportCoupé — internally designated CL203 — launched in October 2000 as a three-door hatchback-coupé based on the W203 C-Class platform.

Designed to compete with the BMW 3 Series Compact, the CL203 offered coupé styling with hatchback practicality. A major facelift in spring 2004 refreshed the engine line-up, introducing the M271 supercharged four-cylinders and the OM642 V6 diesel. From 2008, the car was rebadged as the CLC-Class and continued in production until February 2011. Around 370,000 examples were produced.

Key Facts

Platform

Mercedes W203 (shared with saloon/estate)

Predecessor

None (new model line)

Successor

C204 (W204-based coupé)

Sibling body styles in this generation

W203 Saloon, S203 Estate

Market Intelligence

No [MB-VERIFIED] enquiry data exists for the CL203 — the model is absent from EM_Proprietary_Data's per-model table, reflecting its lower-volume UK status compared to the C-Class saloon.

Mercedes C-Class CL203 — Overview

The Mercedes-Benz C-Class SportCoupé — internally designated CL203 — launched in October 2000 as a three-door hatchback-coupé based on the W203 C-Class platform.

Designed to compete with the BMW 3 Series Compact, the CL203 offered coupé styling with hatchback practicality. A major facelift in spring 2004 refreshed the engine line-up, introducing the M271 supercharged four-cylinders and the OM642 V6 diesel. From 2008, the car was rebadged as the CLC-Class and continued in production until February 2011. Around 370,000 examples were produced.

Key Facts

Platform

Mercedes W203 (shared with saloon/estate)

Predecessor

None (new model line)

Successor

C204 (W204-based coupé)

Sibling body styles in this generation

W203 Saloon, S203 Estate

Market Intelligence

No [MB-VERIFIED] enquiry data exists for the CL203 — the model is absent from EM_Proprietary_Data's per-model table, reflecting its lower-volume UK status compared to the C-Class saloon.

Best & Worst Engines

Thin-Data Summary

“The CL203's engine range offers genuine variety — and genuine pitfalls. For diesel buyers, the OM642 V6 in the C320 CDI (post-2005) is the standout: smooth, refined and robust with few major failure modes. The M271 four-cylinder petrols (C180/C200 Kompressor) are the volume choice, but they carry a significant risk: timing chain and camshaft adjuster wear that can lead to catastrophic engine failure from as early as 45,000 miles. The M111 engines in pre-facelift cars (C180/C230 Kompressor) are simpler and more durable than the M271, but they're older and less refined. The C32 AMG (M112 supercharged V6) and C55 AMG (M113 V8) are genuine performance icons — rapid, charismatic and well-supported — but running costs are substantial. The rare C30 CDI AMG is a collector's piece: the only diesel AMG ever made, with 231 bhp from a 3.0-litre five-cylinder, but parts are now scarce. Buying instruction: prioritise post-2005 C320 CDI diesels or well-maintained C180 Kompressors with documented timing chain history — and avoid any M271-engined car without proof of chain and cam adjuster work.”

Who it's for:

Thin-Data Summary

“The CL203's engine range offers genuine variety — and genuine pitfalls. For diesel buyers, the OM642 V6 in the C320 CDI (post-2005) is the standout: smooth, refined and robust with few major failure modes. The M271 four-cylinder petrols (C180/C200 Kompressor) are the volume choice, but they carry a significant risk: timing chain and camshaft adjuster wear that can lead to catastrophic engine failure from as early as 45,000 miles. The M111 engines in pre-facelift cars (C180/C230 Kompressor) are simpler and more durable than the M271, but they're older and less refined. The C32 AMG (M112 supercharged V6) and C55 AMG (M113 V8) are genuine performance icons — rapid, charismatic and well-supported — but running costs are substantial. The rare C30 CDI AMG is a collector's piece: the only diesel AMG ever made, with 231 bhp from a 3.0-litre five-cylinder, but parts are now scarce. Buying instruction: prioritise post-2005 C320 CDI diesels or well-maintained C180 Kompressors with documented timing chain history — and avoid any M271-engined car without proof of chain and cam adjuster work.”

Who it's for:

Mercedes C-Class CL203 — Ownership Economics

EngineTypical MileageCommon Major FailureRepair Cost (Specialist)Replacement Cost (Recon)Ownership Verdict

M111.951 (C180 Kompressor)80k–120kSupercharger clutch£400–£800£1,200–£2,500

Solid choice — simpler than M271

M111.981 (C230 Kompressor)80k–120kSupercharger clutch£500–£1,000£1,800–£3,500

Good performance — but thirsty

M271.921/946/948 (Kompressor)45k–90kTiming chain + cam adjusters£800–£2,000£1,500–£3,200

High risk — budget for chain work

M112.961 (C32 AMG)60k–100kIntercooler pump, supercharger£800–£2,000£4,000–£7,500

Fast but costly — AMG tax applies

M272.960 (C350)60k–100kBalance shaft sprocket wear£1,500–£3,000£3,500–£6,000

Watch — pre-2008 M272 balance shaft risk

OM611.962 (C200/C220 CDI)100k–150k+Injector seal failure£400–£1,000£2,500–£4,200

Solid diesel — robust and economical

OM612.990 (C270 CDI)100k–150k+Injector seal failure, turbo£500–£1,200£3,200–£5,500

Good torque — but 5-cylinder parts cost

OM642.960 (C320 CDI)100k–180kOil cooler seal leak£800–£1,500£3,500–£6,000

Best diesel — smooth, refined, reliable

EngineTypical MileageCommon Major FailureRepair Cost (Specialist)Replacement Cost (Recon)Ownership Verdict

M111.951 (C180 Kompressor)80k–120kSupercharger clutch£400–£800£1,200–£2,500

Solid choice — simpler than M271

M111.981 (C230 Kompressor)80k–120kSupercharger clutch£500–£1,000£1,800–£3,500

Good performance — but thirsty

M271.921/946/948 (Kompressor)45k–90kTiming chain + cam adjusters£800–£2,000£1,500–£3,200

High risk — budget for chain work

M112.961 (C32 AMG)60k–100kIntercooler pump, supercharger£800–£2,000£4,000–£7,500

Fast but costly — AMG tax applies

M272.960 (C350)60k–100kBalance shaft sprocket wear£1,500–£3,000£3,500–£6,000

Watch — pre-2008 M272 balance shaft risk

OM611.962 (C200/C220 CDI)100k–150k+Injector seal failure£400–£1,000£2,500–£4,200

Solid diesel — robust and economical

OM612.990 (C270 CDI)100k–150k+Injector seal failure, turbo£500–£1,200£3,200–£5,500

Good torque — but 5-cylinder parts cost

OM642.960 (C320 CDI)100k–180kOil cooler seal leak£800–£1,500£3,500–£6,000

Best diesel — smooth, refined, reliable

The CL203 rule

A £3,500–£6,000 C320 CDI recon against a £3,000–£8,000 CL203 sits at 44–200% of the car's value. On a sub-£4,000 example, that brushes our 70% Mercedes threshold — we'll honestly tell you to walk away. Against a well-kept £7,000+ example, the same recon drops to a more manageable 50–85% — a repair decision, not a financial one. Value the car first.

Key Takeaways

Which CL203 Costs Least To Own?
C200 CDI (OM611) — simple diesel, robust, cheap parts.
Which CL203 Costs Most To Own?
C32 AMG (M112) — supercharger, AMG-specific parts, high running costs.
Which CL203 Is Best Value?
C320 CDI post-2005 (OM642) — the most reliable engine in the range with strong economy and refinement.

Common Problems

01

M271

Timing Chain and Cam Adjuster Wear

Affected models:

CL203 C160/C180/C200 Kompressor (M271.921/946/948), 2004–2011.

Typical failure mileage:

45,000–90,000 miles.

Root cause:

The M271 engine family suffers from premature timing chain stretch and wear to the camshaft adjuster sprockets. The chain tensioner is also a known weak point. Cold-start rattling is the classic warning sign — if ignored, the chain can jump, causing piston-to-valve contact and catastrophic engine failure.

Tiered Cost Table

Our Recommendation

On any M271-engined CL203 with no documented chain history, treat this as overdue preventative maintenance — an £800–£1,800 repair is dramatically cheaper than the £2,500–£4,500 replacement that follows if ignored. Cold-start rattle is your warning; don't ignore it.

Compare M271 engine prices for your CL203

02

OM611/OM612

Injector Seal Failure ("Black Death")

Affected models:

CL203 C200/C220 CDI (OM611), C270 CDI (OM612).

OM611/OM612 Injector Seal Failure ("Black Death")

Typical failure mileage:

80,000–130,000 miles.

Root cause:

The injector seals on the OM611 and OM612 diesel engines degrade over time, allowing combustion gases to escape past the seal. This causes a characteristic black, tar-like carbon buildup around the injector — known in Mercedes circles as "Black Death" — which can eventually seize the injector in the cylinder head.

Tiered Cost Table

Our Recommendation

At the first sign of a diesel smell in the cabin or visible black residue around injectors, get the seals inspected immediately — a £400–£800 seal replacement is far cheaper than the £900–£1,500 head repair that follows if ignored.

Compare OM611/OM612 engine prices for your CL203

03

M272

Balance Shaft Sprocket Wear

Affected models:

CL203 C350 (M272.960), 2005–2008.

Typical failure mileage:

60,000–100,000 miles.

Root cause:

Early M272 V6 engines (pre-2008) suffer from premature wear to the balance shaft sprocket, which is made of softer metal than the chain. This causes the timing chain to jump, leading to engine misfire, rough running and, in severe cases, piston-to-valve contact.

Tiered Cost Table

Our Recommendation

If you're buying a C350, check the engine number against the affected range — Mercedes revised the sprocket in late 2008. A £1,200–£2,000 preventative repair is cheaper than the £2,800–£5,000 replacement that follows if ignored.

Compare M272 engine prices for your CL203

04

C32

AMG Intercooler Pump Failure

Affected models:

CL203 C32 AMG Kompressor (M112.961), 2002–2008.

Typical failure mileage:

50,000–80,000 miles.

Root cause:

The electric intercooler water pump on the C32 AMG is a known weak point. When it fails, the supercharger charge air isn't cooled effectively, leading to reduced performance, heat soak and, in extreme cases, engine damage.

Tiered Cost Table

Our Recommendation

On any C32 AMG, replace the intercooler pump as preventative maintenance — it's a £350–£600 job that protects a £4,000–£7,500 engine. Don't wait for it to fail.

Compare C32 AMG engine prices for your CL203

CL203 Engine Replacement Costs — By Engine and Condition

VariantEngine CodeUsed (Supply)Reconditioned (Supply)Rebuilt (Supply)Labour Hours

C180 Kompressor (pre-2004)M111.951£600–£1,200£1,200–£2,500£1,800–£3,5008–10 hrs

C230 KompressorM111.981£800–£1,800£1,800–£3,500£2,500–£4,5008–10 hrs

C160/C180 Kompressor (post-2004)M271.921/946£700–£1,500£1,500–£2,800£2,200–£4,00010–12 hrs

C200 KompressorM271.948£800–£1,800£1,800–£3,200£2,500–£4,50010–12 hrs

CLC 180 KompressorM271.950£800–£1,800£1,800–£3,500£2,500–£4,50010–12 hrs

C32 AMG KompressorM112.961£2,000–£4,000£4,000–£7,500£6,000–£10,00014–18 hrs

C350M272.960£1,800–£3,200£3,500–£6,000£5,000–£8,00012–16 hrs

C55 AMGM113.944£2,500–£5,000£5,000–£9,000£7,000–£12,00016–20 hrs

C200/C220 CDIOM611.962£1,200–£2,200£2,500–£4,200£3,500–£5,50010–12 hrs

C270 CDIOM612.990£1,500–£2,800£3,200–£5,500£4,500–£7,00012–14 hrs

C30 CDI AMGOM612.967£2,000–£4,000£4,500–£7,000£6,000–£9,00014–18 hrs

C320 CDIOM642.960£1,800–£3,200£3,500–£6,000£5,000–£8,00012–14 hrs

No Generation variance from the baseline figures — the CL203 shares its engine bay layout with the W203 saloon, so costs are consistent.

Core Variants

Diesel Variants

C200 CDIC220 CDIC270 CDIC30 CDI AMGC320 CDI

Petrol Variants

C160 KompressorC180 KompressorC200 KompressorC230 KompressorC32 AMG KompressorC350C55 AMG

Scope note: All variants listed are CL203 (C-Class SportCoupé/CLC, 2000–2011) only. The CL203 was rebadged as the CLC-Class from 2008 to 2011, but the underlying platform and engine range remained largely unchanged. The CLC 180 Kompressor (M271.950) and CLC 200 CDI (OM646.962) are included here as part of the same CL203 generation.

Core Variants

Diesel Variants

C200 CDIC220 CDIC270 CDIC30 CDI AMGC320 CDI

Petrol Variants

C160 KompressorC180 KompressorC200 KompressorC230 KompressorC32 AMG KompressorC350C55 AMG

Scope note: All variants listed are CL203 (C-Class SportCoupé/CLC, 2000–2011) only. The CL203 was rebadged as the CLC-Class from 2008 to 2011, but the underlying platform and engine range remained largely unchanged. The CLC 180 Kompressor (M271.950) and CLC 200 CDI (OM646.962) are included here as part of the same CL203 generation.

Market Intelligence

Most Requested E90 Engines (2025)

Most Requested E90 Variants

Average E90 Replacement Cost

Most Common E90 Failures

FAQ

BMW 3 Series E90 rear three-quarter view

Why UK Mercedes CL203 Owners Trust MercedesEngines.uk

Trusted CL203 Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real CL203 owners, as part of the Engine Finders network.
Compare CL203 Engine Replacement Companies
see prices, warranty terms and supply-and-fit options side-by-side before you commit to any repair.
UK Engine Replacement Services for CL203
covering every variant from the C180 Kompressor to the C32 AMG, with supply-only or full supply-and-fit available nationwide.

Find the best Mercedes CL203 engine replacement UK drivers rely on. Compare real prices from trusted Mercedes specialists on EnginesMarket today and get back on the road with confidence.

Compare Mercedes C-Class CL203 Engine Prices on EnginesMarket

Why UK Mercedes CL203 Owners Trust MercedesEngines.uk

Trusted CL203 Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real CL203 owners, as part of the Engine Finders network.
Compare CL203 Engine Replacement Companies
see prices, warranty terms and supply-and-fit options side-by-side before you commit to any repair.
UK Engine Replacement Services for CL203
covering every variant from the C180 Kompressor to the C32 AMG, with supply-only or full supply-and-fit available nationwide.

Find the best Mercedes CL203 engine replacement UK drivers rely on. Compare real prices from trusted Mercedes specialists on EnginesMarket today and get back on the road with confidence.

Compare Mercedes C-Class CL203 Engine Prices on EnginesMarket