Mercedes C-Class C205Coupé2015–2023

Mercedes C-Class C205 Engines — The Complete UK Guide

Every engine fitted to the second-generation C-Class Coupé — from the M274 four-cylinder petrol to the M276 V6 and the M177 V8 that powers the AMG C63. Real UK costs, honest reliability data, and the 2018 facelift's M264 engine switch explained. Backed by real UK enquiries in 2025 [PATTERN DATA].

Explore C205 Engines
C205Enquiries (2025)
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Mercedes C-Class C205 Engine Codes — The Complete Database

Every engine fitted to the C205 coupé specifically — including pre-facelift M274/M276 units and post-facelift M264/M177/OM654 replacements.

Engine CodeFuelPowerYearsReliabilityEnquiriesAvg. Recon Cost
M274.910M274Petrol156 PS / 115 kW2015–2018★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£1,800–£3,200 [PLACEHOLDER — confirm vs cost sheet]
M264.915M264Petrol156 PS / 115 kW2019–2023★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£1,800–£3,200 [PLACEHOLDER — confirm vs cost sheet]
M274.920M274Petrol245 PS / 180 kW2015–2018★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£2,200–£4,000 [PLACEHOLDER — confirm vs cost sheet]
M264.920M264Petrol258 PS / 190 kW2018–2023★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£2,400–£4,200 [PLACEHOLDER — confirm vs cost sheet]
M276.823M276Petrol333 PS / 245 kW2016–2018★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£3,500–£6,000 [PLACEHOLDER — confirm vs cost sheet]
M276.823M276Petrol367 PS / 270 kW2016–2018★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£4,000–£7,000 [PLACEHOLDER — confirm vs cost sheet]
M276.823M276Petrol390 PS / 287 kW2018–2023★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£4,000–£7,000 [PLACEHOLDER — confirm vs cost sheet]
M177.980M177Petrol476 PS / 350 kW2015–2023★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£8,000–£14,000 [PLACEHOLDER — confirm vs cost sheet]
M177.980M177Petrol510 PS / 375 kW2015–2023★★★☆☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£9,000–£16,000 [PLACEHOLDER — confirm vs cost sheet]
OM651.921OM651Diesel136 PS / 100 kW2015–2018★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£2,000–£3,500 [PLACEHOLDER — confirm vs cost sheet]
OM651.921OM651Diesel170 PS / 125 kW2015–2018★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£2,200–£3,800 [PLACEHOLDER — confirm vs cost sheet]
OM651.921OM651Diesel204 PS / 150 kW2015–2018★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£2,400–£4,200 [PLACEHOLDER — confirm vs cost sheet]
OM654.920OM654Diesel194 PS / 143 kW2018–2023★★★★☆ [PROVISIONAL — pending dedicated Engine Page]— (pattern data)£2,400–£4,000 [PLACEHOLDER — confirm vs cost sheet]
BMW 3 Series E90

Overview

Mercedes C-Class C205 — Overview

The C205 is the second-generation Mercedes-Benz C-Class Coupé, produced from 2015 to 2023 as the two-door counterpart to the W205 saloon.

It shares the Modular Rear Architecture (MRA) platform with the saloon and estate, offering a sleeker, more sporting profile. The engine range spanned M274 and M264 four-cylinder petrols, M276 V6 petrols in the C400 and AMG C43, the M177 V8 in AMG C63 guise, plus OM651 and OM654 diesel four-cylinders. A significant 2018 facelift brought new M264 engines, a power increase for the C43, and the OM654 diesel.

Key Facts

Platform

Mercedes MRA (Modular Rear Architecture)

Predecessor

Mercedes-Benz C-Class C204

Successor

Mercedes-Benz CLE (C236)

Sibling body styles in this generation

W205 saloon, S205 estate, A205 cabriolet

Market Intelligence

The C205 C-Class Coupé generated UK engine enquiries in 2025 [PATTERN DATA], with the <a href='https://mercedesengines.uk/engine/m274'>M274</a> petrol fours and OM651 diesels remaining the most commonly discussed among specialists.

Best & Worst Engines

 engine

Thin-Data Summary

Thin-Data Fallback mode — one paragraph: The C205's most dependable engine is the M274 2.0-litre four-cylinder petrol (C300, 245 PS) — widely considered the pick of the pre-facelift range for its strong performance, proven durability, and relative simplicity. The facelift M264 2.0-litre (C300, 258 PS) adds EQ Boost mild-hybrid technology, improving refinement and economy. The OM651 2.1-litre diesel line is robust and economical — the C250d's 204 PS offers strong real-world performance with excellent fuel economy. The OM654 diesel introduced with the facelift is a significant improvement — quieter, more refined, and with better low-end torque. The AMG C63's M177 V8 is a masterpiece but carries high running costs — hot-vee design means heat-related wear on ancillaries, and parts are eye-wateringly expensive. Avoid any pre-facelift car without documented service history, as the M274's camshaft adjusters and OM651's injector seals are known weak points.

Who it's for:

Mercedes C-Class C205 — Ownership Economics

EngineTypical MileageCommon Major FailureRepair Cost (Specialist)Replacement Cost (Recon)Ownership Verdict
M274.910 (C180)60k–100kCamshaft adjuster wear, thermostat£400–£800£1,800–£3,200
Entry Choice — affordable C205 entry point
M264.915 (C180 facelift)60k–100k48V system, coolant leaks£400–£800£1,800–£3,200
Modern Petrol — mild-hybrid refinement
M274.920 (C300)60k–100kCamshaft adjusters, HPFP£500–£1,000£2,200–£4,000
Best Petrol — the sweet spot of the range
M264.920 (C300 facelift)60k–100k48V system, water pump£500–£1,000£2,400–£4,200
Improved Power — 258 PS with EQ Boost
M276.823 (C400)50k–90kCooling system, engine mounts£600–£1,200£3,500–£6,000
V6 Smoothness — but costly to maintain
M276.823 (C43 367 PS)50k–90kCooling system, turbo seals£700–£1,500£4,000–£7,000
AMG Entry — V6 performance, V8 running costs?
M276.823 (C43 390 PS)50k–90kCooling system, turbo seals£700–£1,500£4,000–£7,000
Facelift AMG — more power, same caveats
M177.980 (C63 476 PS)40k–80kValve stem seals, coolant pipes, engine mounts£1,500–£3,000£8,000–£14,000
V8 Icon — epic engine, epic bills
M177.980 (C63 S 510 PS)40k–80kValve stem seals, coolant pipes£1,500–£3,500£9,000–£16,000
Ultimate C205 — the one to have if you can afford it
OM651.921 (C200d)80k–130kInjector seals, EGR, timing chain£400–£800£2,000–£3,500
Economy Diesel — 136 PS, 60+ MPG
OM651.921 (C220d)80k–130kInjector seals, EGR, timing chain£400–£900£2,200–£3,800
Best Diesel — the volume choice for good reason
OM651.921 (C250d)80k–130kInjector seals, turbo actuator£500–£1,000£2,400–£4,200
Strong Diesel — 204 PS and 50+ MPG
OM654.920 (C220d facelift)80k–130kAdBlue system, EGR cooler£400–£800£2,400–£4,000
Modern Diesel — quieter, cleaner, better

The C205 rule

A £2,200–£4,000 recon on a sub-£10,000 C205 sits at 22–40% of the car's value — viable on most examples. Against a £4,000 engine bill on a C63, the car's value determines the decision — a £35,000 C63 justifies an £8,000–£14,000 recon; a £15,000 example makes it a much harder call. Value the car first, then the engine.

Key Takeaways

  • Which C205 Costs Least To Own?

    C200d (OM651) — proven diesel, 60+ MPG, cheap parts.

  • Which C205 Costs Most To Own?

    AMG C63 S (M177) — V8 complexity, specialist-only work, eye-watering parts prices.

  • Which C205 Is Best Value?

    C300 (M274.920) — 245 PS, reliable four-pot, strong performance without V6 running costs.

Common Problems

C205 Engine Replacement Costs — By Engine and Condition

Core Variants

Core Variants

Diesel Variants

C200dC220dC250d

Scope note: All variants listed are C205 coupé only. W205 saloon, S205 estate, and A205 cabriolet share most of these engines but are covered on their own Generation Pages, since body style affects weight, aerodynamics, and to some extent, labour access. The CLE (C236) succeeded the C205 from 2023.

Market Intelligence

Most Requested E90 Engines (2025)

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        FAQ

        BMW 3 Series E90 rear three-quarter view

        Why UK Mercedes C-Class C205 Owners Trust MercedesEngines.uk

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          every garage and engine rebuilder in our network is vetted, rated and reviewed by real Mercedes owners, as part of the Engine Finders network. We only work with specialists who understand the C205's MRA platform and engine complexities.

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          see prices, warranty terms and supply & fit options side-by-side before you commit. Whether you need a reconditioned M274 or a used M177, we show you the real market.

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