How much does a Land Rover Defender D250 engine replacement cost in the UK?

A reconditioned Defender D250 (AJ20D6) engine typically costs £4,200–£5,800 supply only. Fitting adds £1,000–£1,600 depending on workshop location. Use our calculator for a figure specific to your car.

Is the Defender D250 engine reliable?

The AJ20D6 is JLR’s 3.0-litre inline-six diesel, introduced in 2021 to replace the four-cylinder Ingenium diesel. Early indications are positive — the straight-six is inherently better balanced and shares fewer of the 2.0-litre’s well-documented timing chain and oil dilution problems. A 2026 recall affecting certain AJ20-D6 engines involves the FEAD belt idler pulley — verify recall completion.

What are the common problems with the Defender D250?

The primary known issue is a recall on certain AJ20-D6 engines where the front-end auxiliary drive belt idler pulley can over-rotate after high-torsion input and damage the oil pressure/temperature sensor, causing an oil leak. DPF clogging is also a concern for urban-driven examples — regular motorway running is essential.

Is it worth replacing a Defender D250 engine, or should I scrap the car?

Depends on vehicle value. Against a well-kept £25,000 Defender D250, a £4,800 recon is under 20% of the car’s value — worth it. Even against a higher-mileage £18,000 example, the same recon sits well below our 60% Land Rover threshold. These vehicles hold strong value.

How do I find my Defender D250 engine code?

Listed on the VIN plate and vehicle documentation. The D250 uses the AJ20D6 (also known as DT306) — a 3.0-litre inline-six diesel with 48V mild-hybrid assistance. Production began in 2020/2021. Tell us your registration date and we’ll confirm it for free.

Can I repair the FEAD pulley/sensor issue, or does it need engine replacement?

Yes — this is a recall fix, not an engine replacement scenario. The front-end auxiliary drive belt idler pulley and oil pressure/temperature sensor can be replaced (£200–£400 or free under recall if your vehicle is affected). At the first sign of an oil leak or pressure warning, verify recall status immediately.

Land Rover Defender D2502021–presentAJ20D6

Land Rover Defender D250 Engine Replacement — Compare Prices & Get Quotes

Name: Land Rover Defender D250 UK Engine Enquiry Data 2025
Creator: LandRoverEngine.uk

Get quotes today from trusted UK Land Rover D250 specialists. Compare reconditioned, rebuilt and used AJ20D6 3.0-litre straight-six diesel engines — supply & fit available nationwide.

Supply & Fit Available

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Supply & Fit Available

12-Month Warranty

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Defender D250 Engines — from £2,800 to £5,800Common code: AJ20D6 (3.0 MHEV)

Defender D250 Engines — from £2,800 to £5,800· Common code: AJ20D6 (3.0 MHEV)

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

The D250 THROUGH TIME — Era Map

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

Era Note

Straight-six Ingenium diesel — smoother and more refined than the four-cylinder it replaced

GenerationYearsEngine CodeReliabilityRecon CostEra Note

L663

2021–presentAJ20D6 (3.0 MHEV)★★★★☆ [NEWLY ASSIGNED — see Data Note]£3,400–£5,800 [PLACEHOLDER — confirm vs cost sheet]Straight-six Ingenium diesel — smoother and more refined than the four-cylinder it replaced

Why use this era map?

Every cost guide, reliability rating and engine code on this page is aligned to the data above. This keeps everything consistent and trustworthy.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

Land Rover Defender D250 Engine Replacement Costs

Supply Only£4,200–£5,800

Fitted (Indie)£5,200–£6,900

Warranty12–24 months

Best ForMost owners — best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£2,800–£4,200£3,800–£5,2001–6 monthsBudget priority; vehicle under £15,000

Reconditioned Engine£4,200–£5,800£5,200–£6,90012–24 monthsMost owners — best cost/warranty balance

Rebuilt Engine£5,500–£7,500£6,500–£8,60012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer New£8,500–£12,000£10,000–£13,50024–36 monthsInsurance jobs, warranty claims

Figures above reflect the current L663-generation AJ20D6 engine. The D250 shares its engine block with D200 and D300 variants — costs are similar across the range.

Labour estimate: Fitting a Defender D250 engine typically takes 12–16 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer).

→ Compare D250 engine prices from UK specialists

Common Problems

1. FEAD Belt Idler Pulley — Oil Pressure Sensor Damage (Recall)

2. DPF Clogging (Urban Use)

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Defender D250 — 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.

Defender D250 — 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 SenseFEAD pulley/sensor damage (recall)✅ Yes£200–£400 (or free under recall)Catch it early — recall fix is straightforwardDPF clogging✅ Yes£400–£1,200Regular maintenance item on urban-driven dieselsInjector failure✅ Yes£300–£800 per injectorViable on lower-mileage examplesTurbocharger failure⚠️ Sometimes£1,200–£2,500Viable if caught before debris damages engineCatastrophic bottom-end failure❌ Usually NoEngine replacementLittle is left to repair — straight-six design is generally robust

Buying This Defender D250? Check These First

Buy If

Recall completed or verified not affected (FEAD pulley/sensor)
Documented DPF maintenance history (motorway runs, regen cycles)
Full service history with sub-15,000-mile oil intervals
2021-onward build — the straight-six is a meaningful upgrade over the four-cylinder diesel

Avoid If

Unresolved oil pressure warning light or visible oil leak
No proof of recall status on 2024–2027 models
Poor service history — the Ingenium range is unforgiving of neglect
Engine warning light with no diagnosis

Closing Verdict

The Defender D250’s AJ20D6 represents a genuine step forward from the four-cylinder Ingenium diesel that preceded it. The straight-six is smoother, more refined, and carries fewer of the 2.0-litre’s timing chain and oil dilution problems. That said, it’s still a modern, emissions-controlled diesel — DPF maintenance and recall completion are non-negotiable. Buy on documented history, not just on badge appeal.

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

→ Compare D250 engine prices before you buy

Don't Guess. Compare.

Get real quotes from vetted UK specialists and make the right call for your 320d.

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Buying Checklist

Before you buy a used Land Rover Defender D250 (or before you commit to an engine replacement), check these:

Cold Start — Listen for any unusual rattle or knock on startup (straight-six should be smooth)

Service History — including which engine era (AJ20D6 — 2021-onward) and confirmed oil-interval discipline

Smoke Check — Blue/black smoke on startup can indicate injector or DPF issues

Turbo Boost — Test acceleration; any lag, whistling, or grinding?

DPF Regeneration — Check history; short journeys accelerate wear on all diesel eras

Oil Consumption — Does it use more than 1L per 1,000 miles?

Engine Warning Light — Have codes been read? Any unresolved issues? Check recall status for FEAD pulley/sensor

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.

AJ20D6 (DT306)

Years2021–present

Power249 PS (183 kW)

2025 Enquiries— (pattern data)

Avg. Recon Cost£4,200–£5,800 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

AJ20D6 (DT306)2021–present249 PS (183 kW)— (pattern data)£4,200–£5,800 [PLACEHOLDER]

Technical Specs

AJ20D6

Displacement2,997 cc

Cylinders6-cylinder inline

Compression Ratio15.5:1

Fuel SystemCommon-rail direct injection

TurbochargerSingle turbocharger

Mild Hybrid48V MHEV system

→ Compare D250 engine prices for your Defender

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Market Intelligence

Most Common Failure

FEAD belt idler pulley / oil pressure sensor (recall) — affects certain 2024–2027 AJ20-D6 engines

Average Enquiry Mileage

45,000

–65,000 miles

[PATTERN DATA]

Average Replacement Cost

£4,800

reconditioned, supply only

[PLACEHOLDER — confirm vs cost sheet]

Most Requested Engine Code

AJ20D6

[PATTERN DATA]

Peak Enquiry Season

Winter — cold starts and DPF issues more pronounced

[PATTERN DATA]

Regional Demand

South East20%

London18%

Midlands14%

PATTERN DATA

Regional Demand Breakdown

20%South East

18%London

FAQ

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.

Why UK Land Rover Defender D250 Owners Trust LandRoverEngine.uk

Trusted D250 Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real Defender owners, as part of the Engine Finders network, covering the full AJ20D6 straight‑six era from 2021 onwards.
Compare D250 Engine Replacement Companies
see prices, warranty terms and supply & fit options side‑by‑side before you commit.
UK Engine Replacement Services for D250
supply‑only or full supply & fit available nationwide, including recall‑aware specialists for the FEAD pulley/sensor issue.

Find the best Land Rover Defender D250 engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and get back on the road with confidence.

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100% Free

No hidden fees

No Obligation

Get quotes with zero pressure

UK Specialists

20+ vetted experts

12-Month Warranty

As standard

Nationwide Delivery

Supply & fit available