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

A reconditioned Defender D250 (AJ20D6) engine typically costs £3,500–£5,800 supply only. Fitting adds £1,000–£1,700 depending on location and workshop rates. Use our calculator for a figure specific to your car.

Is the Land Rover Defender D250 engine reliable?

The AJ20D6 is a 3.0-litre six-cylinder Ingenium diesel introduced with the L663 Defender in 2020. It's generally considered more robust than the 2.0-litre four-cylinder Ingenium diesels, though it shares the rear-mounted timing chain design. A 2026 recall affected 2024–2027 models for a FEAD belt idler pulley issue — but this is a free fix, not a fundamental engine flaw.

What are the common problems with the Defender D250?

The main known issues are: (1) FEAD belt idler pulley failure on 2024–2027 models (free recall fix), (2) timing chain stretch — shared with the wider Ingenium diesel family, and (3) oil dilution from DPF regeneration on vehicles used predominantly for short urban trips.

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

Depends on vehicle value. Against a well-kept £40,000+ Defender D250, a £4,500 recon is around 11% of the car's value — worth it. The L663 Defender holds its value extremely well, making engine replacement a viable option on almost all examples.

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 six-cylinder diesel. Tell us your registration and we'll confirm it for free.

Can I repair the AJ20D6 timing chain, or does it need replacement?

Yes — if caught early. A preventative chain replacement (£1,200–£2,500) is far cheaper than a catastrophic chain snap (£4,500–£9,500 engine replacement). At the first sign of cold-start rattle, book an inspection immediately.

Land Rover Defender D2502020–present1 Engine Generation

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 Defender D250 specialists. The 3.0-litre AJ20D6 Ingenium diesel is a modern six-cylinder unit with mild-hybrid tech — compare reconditioned, rebuilt and used engines with supply & fit available nationwide.

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12-Month Warranty

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Supply & Fit Available

12-Month Warranty

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Defender D250 Engines — from £3,500 to £9,500Engine code: AJ20D6 (DT306)

Defender D250 Engines — from £3,500 to £9,500· Engine code: AJ20D6 (DT306)

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Land Rover Defender D250 — Which Engine Does Your Car Actually Have?

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

Era Note

3.0-litre Ingenium six-cylinder diesel with 48V MHEV — chain-driven, generally robust

GenerationYearsEngine CodeReliabilityRecon CostEra Note

L663

2020–presentAJ20D6 (DT306)★★★★☆ [NEWLY ASSIGNED — see Data Note]£3,500–£5,800 [PLACEHOLDER]3.0-litre Ingenium six-cylinder diesel with 48V MHEV — chain-driven, generally robust

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£3,500–£5,800

Fitted (Indie)£4,500–£6,800

Warranty12–24 months

Best ForMost owners — best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£3,500–£5,500£4,500–£6,5001–6 monthsBudget priority; lower-mileage donor

Reconditioned Engine£3,500–£5,800£4,500–£6,80012–24 monthsMost owners — best cost/warranty balance

Rebuilt Engine£5,500–£9,500£6,500–£10,50012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer New£8,000–£12,000+£9,000–£14,000+24–36 monthsInsurance jobs, warranty claims

Figures above reflect the current L663-generation AJ20D6, the only engine used in the Defender D250.

Labour estimate: Fitting a Defender D250 engine typically takes 14–18 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer).

→ Compare Defender D250 engine prices from UK specialists

Common Problems

1. FEAD Belt Idler Pulley Failure (2024–2027 models)

Symptoms: Engine oil leak, oil pressure warning light, potential oil temperature sensor damage

Typical mileage: Any mileage — recall affects 2024–2027 model year vehicles

Repair cost: £0 (free recall replacement at JLR dealer)

Replacement cost: N/A — repair only (does not progress to engine replacement if addressed)

🟠 Check - verify recall completion status immediately

Our recommendation:

This is a genuine safety recall affecting certain AJ20-D6 engines where the FEAD belt idler pulley can over-rotate after high-torsion input and damage the oil pressure sensor. The fix is free at any JLR dealership. Before buying any 2024–2027 Defender D250, confirm the recall work has been completed — it's a straightforward check that could save you from an oil leak and potential roadside hazard.

Read the full FEAD belt failure guide → /failures/fead-belt-idler-pulley/ [NEW FAILURE PAGE NEEDED]

1. FEAD Belt Idler Pulley Failure (2024–2027 models)

Symptoms: Engine oil leak, oil pressure warning light, potential oil temperature sensor damage

Typical mileage: Any mileage — recall affects 2024–2027 model year vehicles

Repair cost: £0 (free recall replacement at JLR dealer)

Replacement cost: N/A — repair only (does not progress to engine replacement if addressed)

🟠 Check - verify recall completion status immediately

Our recommendation:

Read the full FEAD belt failure guide → /failures/fead-belt-idler-pulley/ [NEW FAILURE PAGE NEEDED]

2. Timing Chain Stretch (Ingenium Diesel Family)

Symptoms: Cold-start rattle, metallic ticking from engine, engine warning light, reduced performance

Typical mileage: 60,000–120,000 miles (more common on earlier Ingenium diesels)

Repair cost: £1,200–£2,500 (preventative chain replacement)

Replacement cost: £4,500–£9,500 (catastrophic failure)

🟡 Monitor - book inspection if you hear rattle

Our recommendation:

The AJ20D6 shares the Ingenium diesel family's rear-mounted timing chain design. While the six-cylinder unit is generally more robust than the 2.0-litre four-cylinder, chain stretch remains a known pattern across the Ingenium diesel range. At the first sign of cold-start rattle, get the chain inspected — a £1,200–£2,500 preventative repair is dramatically cheaper than the £4,500+ replacement that follows a snapped chain.

Read the full timing chain failure guide

3. Oil Dilution (DPF Regeneration)

Symptoms: Rising oil level on dipstick, diesel smell in oil, DPF warning light, reduced fuel economy

Typical mileage: Any mileage — short journeys accelerate the issue

Repair cost: £100–£300 (oil change + DPF regeneration)

Replacement cost: N/A — repair only (does not progress to engine replacement if addressed)

🟡 Monitor - book inspection soon

Our recommendation:

Like all modern diesel engines with DPF systems, the AJ20D6 can suffer from oil dilution if the car is used predominantly for short urban trips. The engine's mild-hybrid system helps, but it doesn't eliminate the need for regular motorway running to complete passive DPF regenerations. If you're buying a Defender D250 primarily for city use, factor in occasional longer runs or consider the petrol P400 instead.

Read the full oil dilution guide

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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 belt idler pulley failure✅ Yes (recall)£0 (free at dealer)Always — free recall fixTiming chain stretch (early detection)✅ Yes£1,200–£2,500Preventative — catches the fault before catastrophic failureTiming chain snapped❌ Usually NoEngine replacementPiston-valve contact means little is left to repairOil dilution / DPF issues✅ Yes£100–£300Regular oil changes and DPF regeneration cyclesTurbocharger failure⚠️ Sometimes£1,500–£3,000Viable on lower-mileage examples; assess overall engine health

Buying This Defender D250? Check These First

Buy If

2024–2027 model with confirmed FEAD recall completion
Full service history with 10,000–12,000-mile oil intervals
Evidence of regular motorway use (DPF health)
Low-mileage example with documented chain inspection history

Avoid If

2024–2027 model with no proof of FEAD recall work
Cold-start rattle and no timing chain history
Poor service history — the Ingenium family is unforgiving of neglect
Engine warning light with no diagnosis

Closing Verdict

The Defender D250's AJ20D6 is a modern, sophisticated six-cylinder diesel that represents a meaningful step up from the four-cylinder Ingenium units in terms of refinement and, by most accounts, reliability. The FEAD pulley recall is the single biggest known issue — but it's a free fix, not a design flaw. Buy on documented history, with recall confirmation, and you're looking at one of the more robust diesel options in the L663 range.

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

→ Compare Defender D250 engine prices before you buy

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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 1–30 seconds of rattle (timing chain warning)

Service History — Including which engine (AJ20D6) and confirmed oil-interval discipline (10k–12k miles)

Recall Check — Verify FEAD belt idler pulley recall completion on 2024–2027 models

Smoke Check — Excessive white smoke on startup can indicate injector or DPF issues

Oil Level — Check for rising oil level (oil dilution from DPF regeneration)

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

DPF Regeneration History — Short journeys accelerate wear on all modern diesels

Engine Warning Light — Have codes been read? Any unresolved issues?

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)

Years2020–present

Power249 PS (183 kW)

2025 Enquiries— (pattern data)

Avg. Recon Cost£3,500–£5,800 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

AJ20D6 (DT306)2020–present249 PS (183 kW)— (pattern data)£3,500–£5,800 [PLACEHOLDER]

Technical Specs

AJ20D6

Displacement2,996 cc (3.0L)

Cylinders6-cylinder inline

Compression Ratio16.5:1 (typical Ingenium diesel)

Fuel SystemCommon-rail direct injection

TurbochargerTwin-turbo

Mild Hybrid48V MHEV system

→ Compare Defender D250 engine prices for your Land Rover

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Market Intelligence

Most Common Failure

FEAD belt idler pulley recall (2024–2027 models) — affects certain AJ20-D6 engines

Average Enquiry Mileage

35,000

–60,000 miles

[PATTERN DATA]

Average Replacement Cost

£4,500

reconditioned, supply only

[PLACEHOLDER]

Most Requested Engine Code

AJ20D6

[PATTERN DATA]

Peak Enquiry Season

Winter — cold starts expose chain and DPF issues

[PATTERN DATA]

Regional Demand

London20%

South East16%

North West10%

PATTERN DATA

Regional Demand Breakdown

20%London

16%South East

10%North West

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.

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every garage and engine rebuilder in our network is vetted, rated and reviewed by real Defender owners, across the AJ20D6 generation, as part of the Engine Finders network.
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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 — from £3,500 supply-only.

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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