How much does a Mercedes CLA35 AMG engine replacement cost in the UK?

A reconditioned M260 engine typically costs £4,500–£7,000 supply only, with rebuilt units reaching £8,000. Fitting adds £1,200–£1,800. A new engine from a Mercedes main dealer can exceed £10,000. Use our calculator for a figure specific to your CLA35 AMG.

Is the Mercedes CLA35 AMG (M260) engine reliable?

The M260 is considered reliable in its early years of production, benefiting from modern materials, cooling and precise ECU management. However, it has known weaknesses: timing chain tensioner failure (rattling on cold start), cylinder head/valve guide wear (misfires, loss of compression), and Camtronic system failures. Regular maintenance with Mercedes‑approved oil is essential.

What are the common problems with the Mercedes CLA35 AMG engine?

Timing chain tensioner failure (rattling on cold start), cylinder head/valve guide wear (misfires, loss of compression), Camtronic system failure (loss of low‑end power), oil leaks, and carbon buildup on intake valves.

Is it worth replacing a CLA35 AMG engine, or should I scrap the car?

Depends on vehicle value. A CLA35 AMG is a £15,000–£35,000 vehicle — a £5,000–£6,000 recon is 14–40% of the car's value, making replacement viable in most cases. A well‑maintained, lower‑mileage example justifies replacement; a tired, high‑mileage one may not.

How do I find my Mercedes CLA35 AMG engine code?

Listed on the VIN plate and vehicle documentation. The CLA35 AMG engine code is M260 — a 2.0‑litre turbocharged inline‑4. Tell us your registration date and we'll confirm it for free.

Can I prevent the common failures on a CLA35 AMG?

Yes — regular oil changes with Mercedes‑approved MB 229.5 5W‑30 oil every 10,000 km are the most effective prevention. On early cars, have the timing chain tensioner inspected at 40,000 miles. At the first sign of cold‑start rattle, misfire or rough idle, book an inspection immediately.

Mercedes CLA35 AMG2019–presentM260

Mercedes CLA35 AMG Engine Replacement — Compare Prices & Get Quotes

The CLA35 AMG is powered by the M260 2.0‑litre turbocharged four‑cylinder — 306 hp, 400 Nm, and AMG‑specific tuning across the C118 and X118 generations. Get quotes from trusted UK specialists today.

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Mercedes CLA35 AMG Engines — from £2,500 to £8,000M260

Mercedes CLA35 AMG Engines — from £2,500 to £8,000· M260

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

The CLA35 AMG THROUGH TIME — Era Map

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

GenerationYearsEngine CodeReliabilityRecon CostEra Note

Why use this era map?

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

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

Mercedes CLA35 AMG Engine Replacement Costs

Supply Only£4,500–£7,000

Fitted (Indie)£5,700–£8,500

Warranty12–24 months

Best ForMost owners — best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£2,500–£4,500£3,700–£6,0001–6 monthsBudget priority; lower‑mileage donor

Reconditioned Engine£4,500–£7,000£5,700–£8,50012–24 monthsMost owners — best cost/warranty balance

Rebuilt Engine£6,000–£8,000£7,200–£9,60012–24 monthsLong‑term ownership; 3+ year horizon

Main Dealer New£8,000–£12,000£9,200–£13,80024–36 monthsInsurance jobs, warranty claims

Figures above reflect the current M260 generation. A replacement M260 engine costs on average £4,500–£7,000 for a reconditioned unit, with new units from the main dealer significantly higher.

Labour estimate: Fitting a CLA35 AMG engine typically takes 12–16 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer).

→ Compare CLA35 AMG engine prices from UK specialists

Common Problems

1. Timing Chain Tensioner Failure

Symptoms: Rattling noise on cold start (often lasting a few seconds), check engine light with timing‑related fault codes, engine misfires, and in severe cases, loss of power if the chain jumps.

Typical mileage: 40,000–80,000 miles

Repair cost: £1,500–£3,000 (chain, tensioner and guide rails replacement)【PLACEHOLDER — confirm vs cost sheet】

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

🔴 Immediate - if you hear rattle, book an inspection today

Our recommendation:

The M260's timing chain tensioner is a known weak point. Rattling on cold start indicates that the tensioner is failing to maintain proper oil pressure, allowing the chain to slap against its guides. If left unaddressed, the chain can jump timing or snap, resulting in catastrophic engine damage. Regular oil changes with Mercedes‑approved synthetic oil (MB 229.5) every 10,000 km are essential. At the first sign of cold‑start rattle, have the timing chain system inspected immediately.

1. Timing Chain Tensioner Failure

Symptoms: Rattling noise on cold start (often lasting a few seconds), check engine light with timing‑related fault codes, engine misfires, and in severe cases, loss of power if the chain jumps.

Typical mileage: 40,000–80,000 miles

Repair cost: £1,500–£3,000 (chain, tensioner and guide rails replacement)【PLACEHOLDER — confirm vs cost sheet】

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

🔴 Immediate - if you hear rattle, book an inspection today

Our recommendation:

2. Cylinder Head / Valve Guide Wear

Symptoms: Rough running, loss of compression, persistent misfires (even after replacing plugs and coils), high emissions, and in severe cases, coolant and oil mixing.

Typical mileage: 30,000–60,000 miles

Repair cost: £2,500–£4,500 (cylinder head replacement with updated parts)【PLACEHOLDER — confirm vs cost sheet】

Replacement cost: £4,500–£8,000 (full engine replacement if damage is extensive)

🔴 Immediate - if you experience misfires or rough running, book an inspection today

Our recommendation:

The M260 has a known defect in the valve heads — increased wear on exhaust valve seat rings and valve guides can cause insufficiently sealed combustion chambers. This leads to rough running, misfires and high emissions. Mercedes issued a warranty extension for this issue in some markets (ECR‑M0002‑22‑010). If you experience persistent misfires, have the cylinder head inspected immediately — catching it early can save you from a £4,500+ repair bill.

3. Camtronic System Failure

Symptoms: Loss of low‑end power, rough idle, hesitation on acceleration, engine warning light, and in rare cases, complete failure of the variable valve lift system.

Typical mileage: 40,000–80,000 miles

Repair cost: £1,000–£2,500 (Camtronic solenoid or actuator replacement)【PLACEHOLDER — confirm vs cost sheet】

Replacement cost: N/A — repair only

🟠 Check - book inspection urgently if symptoms appear

Our recommendation:

The CAMTRONIC system — which provides variable valve timing — is a rare but expensive failure point on the M260. If you notice a loss of low‑end power or rough running, have the CAMTRONIC system diagnosed. Replacing a failed solenoid or actuator is significantly cheaper than the performance loss and potential engine damage that can result from ignoring the issue.

Weighing Your Options?

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CLA35 AMG — 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.

CLA35 AMG — 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 SenseTiming chain tensioner failure✅ Yes£1,500–£3,000Catch it early — before chain jumpsCylinder head / valve guide wear✅ Yes£2,500–£4,500Replace with updated parts — permanent fixCamtronic system failure✅ Yes£1,000–£2,500Replace solenoid or actuator — cheaper than ignoring itOil leaks✅ Yes£300–£800Routine maintenance — do preventativelySevere engine damage (chain snap / valve failure)❌ Usually NoEngine replacementLittle left to salvage — replacement is the only option

Buying This CLA35 AMG? Check These First

Buy If

No cold‑start rattle — timing chain tensioner in good condition
No misfire history — cylinder head in good condition
Full Mercedes‑Benz service history with MB 229.5 oil spec
2021+ model year — later cars may have fewer early‑production issues

Avoid If

Cold‑start rattle with no tensioner history — timing chain may be failing — walk away
Misfire history with no resolution — cylinder head may be failing
No service history — M260 engines are sensitive to neglect
Reprogrammed / modified engine — increased risks

Closing Verdict

The CLA35 AMG is the more accessible AMG — 306 hp, 4MATIC AWD and daily‑driver usability in a compact, stylish package. The M260 engine is technologically advanced but has known weaknesses: timing chain tensioner failure, cylinder head/valve guide wear, Camtronic failures and carbon buildup. Buy on full service history with evidence of regular oil changes (every 10,000 km), prioritise later‑model cars, and never ignore a cold‑start rattle or misfire.

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

→ Compare CLA35 AMG engine prices before you buy

Don't Guess. Compare.

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Buying Checklist

Before you buy a used Mercedes CLA35 AMG (or before you commit to an engine replacement), check these:

Cold Start — Listen for rattling; timing chain tensioner indicator

Misfire / Rough Running — Check for uneven running; cylinder head or Camtronic indicator

Service History — including engine era (M260) and confirmed oil‑change intervals (10,000 km / MB 229.5 spec)

Carbon Build‑up — Check for rough idle or hesitation; may need walnut blasting

Oil Leaks — Check under the car and around the engine; valve cover and Camtronic seals are common leak points

Turbo Health — Listen for whistling or whining; turbo actuator issues possible

DCT7 Gearbox — Check for hesitation or harsh shifts; AMG Speedshift DCT requires regular service

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.

M260 (2.0 turbo inline‑4)

Years2019–present

Power306 hp (225 kW) @ 5,800 rpm; 400 Nm @ 3,000–4,000 rpm

2025 Enquiries— (pattern data)

Avg. Recon Cost£4,500–£7,000【PLACEHOLDER】

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

M260 (2.0 turbo inline‑4)2019–present306 hp (225 kW) @ 5,800 rpm; 400 Nm @ 3,000–4,000 rpm— (pattern data)£4,500–£7,000【PLACEHOLDER】

Technical Specs

M260 2.0 turbo

Displacement1,991 cc

Cylinders4‑cylinder inline

Compression Ratio10.0:1

Fuel SystemDirect injection

TurbochargerTwin‑scroll turbocharger

Engine Oil SpecMB 229.5 5W‑30

Oil Capacity5.8 litres

Timing DriveChain

→ Compare CLA35 AMG engine prices for your Mercedes

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Market Intelligence

Most Common Failure

Timing chain tensioner failure — rattling on cold start【PATTERN DATA】

Average Enquiry Mileage

30,000

–50,000 miles【PATTERN DATA】

Average Replacement Cost

£5,500

reconditioned, supply only【PLACEHOLDER — confirm vs cost sheet】

Most Requested Engine Code

M260【PATTERN DATA】

Peak Enquiry Season

Autumn/Winter — cold starts expose timing chain issues【PATTERN DATA】

Regional Demand

South East19%

London17%

South West (13%)【PATTERN DATA】

Regional Demand Breakdown

19%South East

17%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.

Find the best Mercedes CLA35 AMG engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and get back on the road with confidence — from £2,500 for a used unit to £8,000 for a fully rebuilt AMG engine.

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No hidden fees

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Get quotes with zero pressure

UK Specialists

20+ vetted experts

12-Month Warranty

As standard

Nationwide Delivery

Supply & fit available