How much does a Mercedes E Class 300d engine replacement cost in the UK-

Supply-only rebuilt OM654 engines range from £3,200 to £5,500 depending on engine code and condition. With specialist fitting, budget £3,600-£6,300 total. OM654.920 (E 300d, 245 hp, 2018-2021): rebuilt £3,200-£5,000. OM654.930 (E 300d, 265 hp with EQ Boost, 2021-2023): rebuilt £3,500-£5,500. Labour adds £400-£800 depending on specialist location.

What are the signs of timing chain failure in an E Class 300d-

Cold-start rattle is the classic early warning sign. A recall was issued for OM654 engines in E-Class (213 platform) vehicles due to timing chain bolt and link wear. Rattle on cold start that disappears after a few seconds. Metallic noises from the rear of the engine. Loss of power or engine management light. Timing chain replacement at a specialist costs £1,500-£2,200.

Is it worth replacing the engine on an E Class 300d-

Yes, if the car is otherwise sound. W213 E Class 300d examples with good service history still command £18,000-£30,000 used, making replacement viable. A quality rebuilt OM654 costs £3,200-£5,500 supply only. The 300d is the most powerful four-cylinder diesel in the E-Class range. A replacement engine with warranty costs less than the depreciation on a newer car. Specialist fitting adds £400-£800, not dealer rates of £1,500+.

What causes the OM654 timing chain to fail on E Class 300d models-

The OM654 timing chain is mounted at the rear of the engine. Individual bolts or chain links can wear under specific driving conditions, leading to a recall for certain vehicles. Chain wear typically occurs between 80,000-120,000 miles. Extended oil change intervals (over 10,000 miles) accelerate wear. Stop-start operation can exaggerate wear. Cold-start rattle is the early warning sign.

What is the difference between the OM654.920 and OM654.930 engines in the E Class 300d-

Both are 2.0-litre four-cylinder diesels. The OM654.930 (2021-2023) features EQ Boost mild-hybrid technology with 48V starter-generator, producing 265 hp (up from 245 hp) and 550 Nm (up from 500 Nm). OM654.920 fitted to E 300d (2018-2021): 180 kW (245 hp), 500 Nm. OM654.930 fitted to E 300d facelift (2021-2023): 195 kW (265 hp), 550 Nm. Both share the same 82mm bore × 92.3mm stroke. Both suffer from the same timing chain wear concerns.

How long does a Mercedes E Class 300d engine last-

With proper maintenance and 8,000-10,000 mile oil changes, OM654 engines regularly reach 200,000-300,000 miles. OM654 is a modern, efficient diesel with robust bottom end. Timing chain inspection/replacement at 80k-100k miles is recommended. Regular AdBlue system maintenance prevents costly tank replacement. Short oil change intervals (8k miles) are critical for timing chain life.

Mercedes E Class 300d SPECIALISTS

Mercedes Benz E Class 300d Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK Mercedes Benz E Class 300d engine specialists. Compare prices on reconditioned, rebuilt and used OM654 diesel engines - supply & fit available nationwide.

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Mercedes Benz E Class 300d Engine

from£2,800 to £5,500

Usedfrom £1,800
Reconditionedfrom £2,800
Common codesOM654.920, OM654.930

Mercedes Benz e-class 300d Used Engine — OM654.920

Mercedes Benz e-classUsed Engine — OM654.920

Mercedes Benz e-class 300d Reconditioned Engine — OM654.920

Mercedes Benz e-classReconditioned Engine — OM654.920

Mercedes Benz e-class 300d Rebuilt Engine — OM654.920

Mercedes Benz e-classRebuilt Engine — OM654.920

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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 Benz E Class 300d Engine History & Specs at a Glance

The E 300d badge was reintroduced with the W213 E-Class generation in 2018, positioned as the most powerful four-cylinder diesel in the range. Powered by the OM654 2.0-litre inline-four turbodiesel, it delivered 245 hp and 500 Nm of torque - later upgraded to 265 hp with the EQ Boost mild-hybrid system in 2021.

2018
W213 E 300d launched with OM654.920 engine, 180 kW (245 hp), 500 Nm, rear-wheel drive
**2018-2021** - E 300d available in saloon (W213), estate (S213), and cabriolet (A238) body styles
2021
Facelift introduces OM654.930 with EQ Boost mild-hybrid, 195 kW (265 hp), 550 Nm
**2021-2023** - E 300d 4MATIC available with 195 kW (265 hp) and 550 Nm
2023
W214 generation launched; E 300d badge replaced by E 300de plug-in hybrid diesel in some markets

Every engine fitted to the Mercedes E Class 300d is covered below, with UK rebuilt pricing and known failure points.

Engine Codes & Pricing

Mercedes Benz E Class 300d Engine Codes Specifications & Replacement Cost

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

OM654.920 — 2.0L Diesel (2018-2021)

Power Output: 180 kW (245 hp) at 4,200 rpm
Torque: 500 Nm at 1,600-2,400 rpm
Years Fitted: 2018-2021 (W213/S213/A238 E-Class)

Can’t find your exact engine code?-> Get quotes for OM654.920 Mercedes E Class 300d engine replacement

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Common Problems

Mercedes E Class 300d Engine Problems Repair Cost vs Replacement

The OM654 engine that powers the E Class 300d is a modern, efficient diesel that replaced the OM651. While generally robust, timing chain wear and AdBlue system failures are the two most significant concerns. Every rebuilt engine supplied through EnginesMarket includes upgraded components designed to address the original failure point, plus a minimum 12-month unlimited mileage warranty. Below, we break down what these failures cost to fix and when replacement is the smarter option.

Common failure points and repair options

Timing Chain Wear

Affected: Mercedes E Class 300d (OM654.920 / OM654.930, 2018-2023)
Typical failure mileage: 80,000 - 120,000 miles

Root cause

The OM654 uses a timing chain mounted at the rear of the engine. Individual bolts or chain links can wear under specific driving conditions. A recall was issued for certain E-Class (213 platform) vehicles with the OM654 engine due to this issue. Extended oil change intervals and stop-start operation accelerate wear.

Repair options

Repair tier	Dealer price	Specialist price
Preventative - Timing Chain Tensioner & Inspection	£800-£1,200	£400-£700
Major - Full Timing Chain Replacement	£2,500-£3,500	£1,500-£2,200
Full Replacement - Rebuilt Engine	£5,000-£8,000	£3,200-£5,500

Our recommendation

The OM654 timing chain recall indicates this is a known issue - if your E Class 300d is within the affected range, check if the recall work has been completed. The cold-start rattle is your early warning - don't ignore it. A specialist timing chain replacement at £1,500-£2,200 is significantly cheaper than a full engine replacement if the chain fails. Given the £18,000+ value of most W213 E 300d examples, preventative chain work is a wise investment.

-> Compare rebuilt OM654 Mercedes E Class 300d engine prices

AdBlue System Failure

Affected: Mercedes E Class 300d (OM654, 2018-2023)
Typical failure mileage: 40,000 - 100,000 miles

Root cause

The AdBlue system (Selective Catalytic Reduction) uses a pump integrated into the AdBlue tank. The pump can fail, or the AdBlue injector can become clogged. Tank crystallisation and NOx sensor failure are also common.

Repair options

Repair tier	Dealer price	Specialist price
Minor - AdBlue Injector Replacement	£400-£700	£250-£450
Major - AdBlue Tank Replacement	£1,200-£2,000	£800-£1,400
Full Replacement - Rebuilt Engine	£5,000-£8,000	£3,200-£5,500

Our recommendation

AdBlue system issues are frustrating but rarely require engine replacement. The most cost-effective approach is early diagnosis - if you see an AdBlue warning light, get it checked promptly. The £250-£450 injector replacement is far cheaper than a £800-£1,400 tank replacement if crystallisation has occurred. Use genuine AdBlue fluid and avoid letting the tank run dry to prevent pump damage.

-> Get OM654 Mercedes E Class 300d AdBlue system quotes

Camshaft & Rocker Wear

Affected: Mercedes E Class 300d (OM654, 2018-2023)
Typical failure mileage: 80,000 - 120,000 miles

Root cause

Camshaft and rocker arm wear has been reported on OM654 engines, particularly around 100,000 miles. This can cause noise, reduced performance, and eventually valvetrain failure if not addressed.

Repair options

Repair tier	Dealer price	Specialist price
Major - Camshaft & Rocker Replacement	£1,500-£2,500	£900-£1,600
Full Replacement - Rebuilt Engine	£5,000-£8,000	£3,200-£5,500

Our recommendation

Camshaft and rocker wear is a known issue on higher-mileage OM654 engines. Regular oil changes (8,000-10,000 miles) with the correct specification oil are critical to prevent premature wear. If you hear unusual top-end noise from your E Class 300d, have it inspected promptly - early intervention can prevent a £3,200+ engine replacement.

-> Get OM654 Mercedes E Class 300d camshaft replacement quotes

Don't Let Engine Failure Write Off Your Mercedes E Class 300d

Whether your E Class 300d is suffering from timing chain rattle, AdBlue system warnings, or camshaft wear, EnginesMarket makes it simple to compare prices from trusted UK Mercedes specialists. Every rebuilt engine in our network includes upgraded components designed to address the original failure point - plus a minimum 12-month unlimited mileage warranty and nationwide delivery. Compare prices, choose a specialist, and get back on the road without the main dealer premium.

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FAQ

Mercedes E Class 300d Engine ReplacementFrequently Asked Questions

Everything Mercedes Benz E Class 300d owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Short summary: Supply-only rebuilt OM654 engines range from £3,200 to £5,500 depending on engine code and condition. With specialist fitting, budget £3,600-£6,300 total.

OM654.920 (E 300d, 245 hp, 2018-2021): rebuilt £3,200-£5,000
OM654.930 (E 300d, 265 hp with EQ Boost, 2021-2023): rebuilt £3,500-£5,500
Labour adds £400-£800 depending on specialist location

-> Compare Mercedes E Class 300d engine replacement costs by entering your reg now

Short summary: Cold-start rattle is the classic early warning sign. A recall was issued for OM654 engines in E-Class (213 platform) vehicles due to timing chain bolt and link wear.

Rattle on cold start that disappears after a few seconds
Metallic noises from the rear of the engine
Loss of power or engine management light
Timing chain replacement at a specialist costs £1,500-£2,200

-> Get quotes for OM654 timing chain replacement before it's too late

Short summary: Yes, if the car is otherwise sound. W213 E Class 300d examples with good service history still command £18,000-£30,000 used, making replacement viable【INDUSTRY ESTIMATE】.

A quality rebuilt OM654 costs £3,200-£5,500 supply only
The 300d is the most powerful four-cylinder diesel in the E-Class range
A replacement engine with warranty costs less than the depreciation on a newer car
Specialist fitting adds £400-£800, not dealer rates of £1,500+

-> Compare rebuilt Mercedes E Class 300d engine prices for your mileage and budget

Short summary: The OM654 timing chain is mounted at the rear of the engine. Individual bolts or chain links can wear under specific driving conditions, leading to a recall for certain vehicles.

Chain wear typically occurs between 80,000-120,000 miles
Extended oil change intervals (over 10,000 miles) accelerate wear
Stop-start operation can exaggerate wear
Cold-start rattle is the early warning sign

-> Get quotes for OM654 timing chain replacement before it's too late

Short summary: Both are 2.0-litre four-cylinder diesels. The OM654.930 (2021-2023) features EQ Boost mild-hybrid technology with 48V starter-generator, producing 265 hp (up from 245 hp) and 550 Nm (up from 500 Nm).

OM654.920 fitted to E 300d (2018-2021): 180 kW (245 hp), 500 Nm
OM654.930 fitted to E 300d facelift (2021-2023): 195 kW (265 hp), 550 Nm
Both share the same 82mm bore × 92.3mm stroke
Both suffer from the same timing chain wear concerns

-> Find the correct Mercedes E Class 300d engine for your exact chassis and engine code

Short summary: With proper maintenance and 8,000-10,000 mile oil changes, OM654 engines regularly reach 200,000-300,000 miles.

OM654 is a modern, efficient diesel with robust bottom end
Timing chain inspection/replacement at 80k-100k miles is recommended
Regular AdBlue system maintenance prevents costly tank replacement
Short oil change intervals (8k miles) are critical for timing chain life

-> Compare Mercedes E Class 300d engine replacement quotes - be ready when the time comes

Why Choose Us

Compare Mercedes E Class 300d Engine Prices Today

Comparing quotes for your Mercedes E Class 300d engine replacement is free, no-obligation, and specific to your exact engine code and model year. Enter your registration above to get tailored prices from vetted UK specialists - whether you need a used OM654.920, a reconditioned OM654.930, or a fully rebuilt unit with warranty and fitting. Don't pay main dealer premiums - compare, choose, and get back on the road with confidence.

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Mercedes Benz E Class 300d Engine Replacement Compare Prices & Get Quotes

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3 Simple Steps to Finding the Right Replacement Engine

Mercedes Benz E Class 300d Engine History & Specs at a Glance

Mercedes Benz E Class 300d Engine Codes Specifications & Replacement Cost

OM654.920 — 2.0L Diesel (2018-2021)

Mercedes E Class 300d Engine Problems Repair Cost vs Replacement

Timing Chain Wear

AdBlue System Failure

Camshaft & Rocker Wear

Don't Let Engine Failure Write Off Your Mercedes E Class 300d

Mercedes E Class 300d Engine ReplacementFrequently Asked Questions

Compare Mercedes E Class 300d Engine Prices Today