Engines Market

Mercedes CLA 45 AMG Specialists

Mercedes Benz CLA 45 AMG Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK Mercedes Benz CLA 45 AMG engine specialists. Compare prices on reconditioned, rebuilt and used M133 and M139 2.0-litre hand-built AMG turbo engines - supply & fit available nationwide.

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Mercedes Benz CLA 45 AMG Engine
from£4,500 to £11,00...
  • Usedfrom £2,800
  • Reconditionedfrom £4,500
  • Common codesM133 DE20 LA, M139 DE20 LA
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How it works

3 Simple Steps to Finding the Right Replacement Engine

Clear information first, then the right engine and specialist for your exact vehicle.

Variant History

Mercedes CLA 45 AMG Engine History & Specs at a Glance

The Mercedes-AMG CLA 45 debuted in 2013 as the flagship performance variant of the CLA range, powered by the M133 2.0-litre turbocharged four-cylinder - at the time the world's most powerful production four-cylinder engine. For the second-generation C118 from 2019, the CLA 45 received the hand-built M139 engine, delivering up to 421 hp and cementing the CLA 45 S as one of the most potent compact performance cars on the market.

Mercedes CLA 45 AMG
  1. 2013

    M133 DE20 LA, 2.0L turbo petrol, 360 hp, 450 Nm - C117 CLA 45 AMG launch; world's most powerful production four-cylinder at launch

  2. 2015

    M133 DE20 LA (facelift), 2.0L turbo petrol, 381 hp, 475 Nm - C117 facelift; power increase to 381 hp

  3. 2019

    M139 DE20 LA, 2.0L turbo petrol, 387 hp (CLA 45) / 421 hp (CLA 45 S) - C118 second-generation launch; hand-built AMG engine; 8-speed DCT

  4. 2019

    CLA 45 S 4MATIC+ debuts with 421 hp, 500 Nm; 0-62 mph in 4.0 seconds

  5. 2023

    CLA 45 S continues with M139 DE20 LA; 48V mild hybrid on some markets

Every AMG 2.0-litre petrol engine fitted to the Mercedes CLA 45 and CLA 45 S is covered below, with UK rebuilt pricing and known failure points.

Engine Codes & Pricing

Mercedes CLA 45 AMG Engine Codes Specifications & Replacement Cost

Find your exact engine code, specs and UK replacement cost guide.

M133 DE20 LA — 2.0L Turbo Petrol (2013-2019) engine

M133 DE20 LA — 2.0L Turbo Petrol (2013-2019)

Power Output
360 hp (2013-2015) / 381 hp (2015-2019)
Torque
450 Nm (2013-2015) / 475 Nm (2015-2019)
Displacement
1,991 cc
Bore x Stroke
83.0 x 92.0 mm
Compression Ratio
9.8:1
Years Fitted
2013-2019

Can’t find your exact engine code?-> Get quotes for M133 DE20 LA Mercedes CLA 45 AMG engine replacement

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Common Problems

Mercedes CLA 45 AMG Engine Problems Repair Cost vs Replacement

The Mercedes-AMG CLA 45 is powered by two generations of hand-built 2.0-litre turbocharged engines - the M133 (2013-2019) and the M139 (2019-present). Both are high-performance units that demand specialist knowledge for repair and replacement. The M133 is known for turbocharger bearing failure and timing chain tensioner issues, while the M139 has reported cylinder head valve spring failures and oil consumption. Every rebuilt engine supplied through EnginesMarket includes upgraded components designed to address the original failure point - plus a minimum 12-month unlimited mileage warranty.

Common failure points and repair options

Turbocharger Bearing Failure

Affected
Mercedes CLA 45 AMG (M133 DE20 LA, 2013-2019)
Typical failure mileage
50,000-80,000 miles
Root cause
The high-boost turbocharger (up to 2.0 bar) places extreme stress on journal bearings. Oil starvation or contamination accelerates wear, leading to shaft play, compressor wheel contact with the housing, and eventual turbo seizure. AMG initiated a service campaign for turbocharger failure due to contamination of the oil feed line . The M133 engine's lack of a bypass valve can also lead to compressor surge and accelerated turbo damage .

Repair options

Repair tierDealer priceSpecialist price
Intermediate - Turbocharger Replacement£4,000-£5,500£2,800-£3,800
Full Replacement - Rebuilt Performance Engine£7,000-£9,000£5,500-£8,000
Our recommendation
On a CLA 45 AMG, we rarely recommend turbo-only replacement unless the failure was caught immediately. Turbo debris almost always contaminates the oil system, and the cost of a second failure justifies going straight to a fully rebuilt engine with upgraded turbo components. At £5,500-£8,000 from a specialist, it's expensive - but it's half what Mercedes main dealers charge for a new engine.
-> Compare rebuilt M133 DE20 LA Mercedes CLA 45 AMG engine prices

Cylinder Head & Valve Spring Failure

Affected
Mercedes CLA 45 AMG / CLA 45 S (M139 DE20 LA, 2019-present)
Typical failure mileage
20,000-50,000 miles
Root cause
Broken valve springs in the cylinder head have been reported on M139 engines, particularly in 2020 models . This typically manifests as a Check Engine Light (CEL), rough engine operation, difficulty starting, or ECO stop/start malfunctions . Some owners have reported cylinder head replacement as a 19-hour job costing approximately $10,000 . Misfires on individual cylinders have also been reported .

Repair options

Repair tierDealer priceSpecialist price
Major - Cylinder Head Replacement£6,000-£8,000£4,500-£6,500
Full Replacement - Rebuilt Engine£9,000-£12,000£7,000-£11,000
Our recommendation
Cylinder head failure is a significant issue affecting the M139 engine. If you experience misfires, loss of power, or engine management lights, get a compression test and cylinder head inspection immediately. If caught early, cylinder head replacement at £4,500-£6,500 from a specialist resolves the issue. However, if the failure has been ignored and bottom-end damage has occurred, full rebuilt engine replacement at £7,000-£11,000 is the only safe option.
-> Compare rebuilt M139 DE20 LA Mercedes CLA 45 AMG engine prices

Oil Consumption

Affected
Mercedes CLA 45 AMG (M133 DE20 LA, M139 DE20 LA, 2013-present)
Typical failure mileage
40,000-70,000 miles
Root cause
High-performance engines with forced induction can experience oil consumption due to piston ring wear, turbocharger oil seal failure, or PCV system issues. M139 engines have been reported to require more frequent oil top-ups between services . M133 engines can suffer from oil leaks from the valve cover gasket and oil filter housing . Aggressive driving and infrequent oil changes accelerate wear.

Repair options

Repair tierDealer priceSpecialist price
Minor - Oil Leak Repair£800-£1,500£500-£1,000
Intermediate - Piston Ring Replacement£5,000-£7,000£3,500-£5,000
Full Replacement - Rebuilt Engine£7,000-£12,000£5,500-£11,000
Our recommendation
On a CLA 45 AMG burning oil excessively, we typically recommend full rebuilt engine replacement rather than just piston rings. The labour to strip and rebuild is almost identical, but a factory-rebuilt unit includes all new bearings, seals, and timing components - and the upgraded rings that fix the design weakness. The price difference is often just £1,000-£2,000, and the rebuilt engine comes with a 12-month warranty.
-> Compare rebuilt CLA 45 AMG engine prices from UK specialists

Timing Chain Tensioner Failure

Affected
Mercedes CLA 45 AMG (M133 DE20 LA, 2013-2019)
Typical failure mileage
50,000-80,000 miles
Root cause
The timing chain tensioner can lose hydraulic pressure, allowing the chain to slacken and produce a rattling or ticking noise on startup . If ignored, the timing chain can jump teeth, causing valves and pistons to collide . Cases of premature chain stretching have been reported, especially with infrequent oil changes or aggressive operation . The M133 engine shares this weakness with the wider M270 engine family.

Repair options

Repair tierDealer priceSpecialist price
Minor - Timing Chain Tensioner Replacement£1,000-£1,600£700-£1,100
Intermediate - Full Timing Chain Replacement£2,500-£3,500£1,800-£2,500
Full Replacement - Rebuilt Engine£7,000-£9,000£5,500-£8,000
Our recommendation
Rattling on cold start for 1-2 seconds is the early warning sign of timing chain tensioner failure. Don't ignore it - specialist tensioner replacement at £700-£1,100 or full timing chain replacement at £1,800-£2,500 resolves the issue if done promptly. If you've been driving with the rattle for months, the chain has almost certainly stretched, and we'd advise moving straight to a rebuilt engine with upgraded timing components.
-> Get quotes for M133 timing chain replacement for your Mercedes CLA 45 AMG

Don't Let Engine Failure Write Off Your Mercedes CLA 45 AMG

Engine failure on a CLA 45 AMG doesn't have to mean the end of the car. Whether you're dealing with M133 turbo failure, M139 cylinder head issues, or timing chain tensioner failure, EnginesMarket makes it simple to compare prices from trusted UK Mercedes CLA 45 AMG specialists. Every rebuilt engine includes upgraded components designed to prevent the original failure from recurring, backed by a minimum 12-month unlimited mileage warranty. Compare prices today and get back on the road without the main dealer premium.

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FAQ

Mercedes CLA 45 AMG Engine ReplacementFrequently Asked Questions

Everything Mercedes Benz CLA 45 AMG owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

Compare Mercedes CLA 45 AMG Engine Prices Today

Comparing quotes for your Mercedes CLA 45 AMG engine replacement is free, quick and carries no obligation. Enter your registration above to get matched with vetted UK specialists who stock the exact M133 or M139 engine for your CLA 45 AMG - whether you need a used unit, a reconditioned engine or a fully rebuilt motor with a 12-month warranty and upgraded components designed to prevent turbocharger or cylinder head failure. Get back on the road with confidence, without the main dealer premium.

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