How much does a Land Rover Defender D350 engine replacement cost in the UK?

A reconditioned D350 engine (AJ20D6) typically costs £3,800–£6,500 supply only. Fitting adds £1,000–£1,700. As this is a relatively new engine, used and reconditioned supply is still developing – prices are indicative. Use our calculator for a figure specific to your vehicle.

Is the Land Rover Defender D350 engine reliable?

The AJ20D6 is JLR's most powerful diesel, introduced in May 2024. Early data is limited, but it builds on the Ingenium 3.0L diesel platform. A recall has been issued for the FEAD belt idler pulley on certain AJ20-D6 engines – check your VIN. When properly maintained, early reports suggest it's a robust, impressive engine.

What are the common problems with the Defender D350?

The main issue identified so far is a recall for the Front-End Auxiliary Drive (FEAD) belt idler pulley, which may over-rotate and damage the oil pressure sensor. Other potential issues shared with the Ingenium family include oil filter housing cracking and water pump pulley belt damage – both subject to prior recalls.

Is it worth replacing a Defender D350 engine, or should I scrap the car?

Given the Defender D350's high value (typically £60,000–£100,000+), a £4,500–£6,500 reconditioned engine is a small fraction of the vehicle's worth. Replacement is almost always financially viable. Even at the higher end (£7,500), it rarely exceeds our 60% Land Rover threshold against current market values.

How do I find my Defender's engine code?

The D350 uses the AJ20D6 (also known as DT306) 3.0-litre Ingenium diesel. This is stamped on the engine block and listed on your V5C. The D350 badge itself confirms the engine – it's the only 350PS diesel offered in the L663 Defender.

Can I repair a D350 engine issue, or does it need replacement?

Most issues identified so far – the FEAD pulley recall, oil filter housing, and water pump belt – are repairs, not full replacements. If caught early, these are straightforward fixes. Major internal failure would require replacement, but there's no widespread evidence of this yet given the engine's recent introduction.

Land Rover Defender D3502024–present3.0L I6 Twin-Turbo Diesel

Land Rover Defender D350 Engine Replacement — Compare Prices & Get Quotes

Name: Land Rover Defender D350 UK Engine Enquiry Data 2025
Creator: LandRoverEngine.uk

Get quotes today from trusted UK Land Rover specialists. Compare reconditioned and rebuilt 3.0-litre Ingenium diesel engines for the D350 — the most powerful diesel Defender ever built, with 350PS and 700Nm of torque. Supply & fit available nationwide.

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Land Rover Defender D350 Engines — from £2,500 to £7,500Engine code: <a href='https://landroverengine.uk/engine/aj20d6'>AJ20D6</a> (DT306)

Land Rover Defender D350 Engines — from £2,500 to £7,500· Engine code: <a href='https://landroverengine.uk/engine/aj20d6'>AJ20D6</a> (DT306)

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

Land Rover Defender D350 — Which Engine Does Your Car Actually Have?

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

Era Note

Most powerful Defender diesel — 350PS, 700Nm, MHEV

GenerationYearsEngine CodeReliabilityRecon CostEra Note

L663

2024–presentAJ20D6 (DT306)★★★★☆ [NEWLY ASSIGNED — see Data Note]£3,500–£6,500 [PLACEHOLDER — confirm vs cost sheet]Most powerful Defender diesel — 350PS, 700Nm, MHEV

Why use this era map?

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

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

Land Rover Defender D350 Engine Replacement Costs

Supply Only£3,800–£6,500

Fitted (Indie)£5,200–£8,200

Warranty12–24 months

Best ForMost owners — best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£2,500–£4,500£3,500–£5,8001–6 monthsBudget priority; lower-mileage salvage units

Reconditioned Engine£3,800–£6,500£5,200–£8,20012–24 monthsMost owners — best cost/warranty balance

Rebuilt Engine£5,500–£7,500£6,900–£9,20012–24 monthsLong-term ownership; maximum reliability

Main Dealer New£8,000–£12,000£10,000–£14,50024–36 monthsInsurance jobs; warranty claims; full provenance

Figures above reflect the current L663 D350 generation. As a relatively new engine, supply of used and reconditioned units is still developing — prices are indicative.

Labour estimate: Fitting a Defender D350 engine typically takes 12–16 hours at £65–£95/hr (independent Land Rover specialist).

→ Compare Defender D350 engine prices from UK specialists

Common Problems

1. FEAD Belt Idler Pulley Issue (AJ20D6 Recall)

Symptoms: Unusual noise from front of engine, potential oil leak, warning lights — may affect engine oil pressure and temperature sensors.

Typical mileage: Any mileage — recall affects 2024–2026 model year vehicles.

Repair cost: £0 (if recalled — dealer repair free) / £300–£600 [PLACEHOLDER] (if out of warranty).

Replacement cost: N/A — repair only (pulley replacement, not full engine replacement).

🟠 Check - book inspection urgently if you hear unusual front-end noise.

Our recommendation:

A recall has been issued for certain AJ20-D6 engines where the Front-End Auxiliary Drive (FEAD) belt idler pulley may over-rotate following high-torsion input. This can cause the pulley to clash with and damage the engine oil pressure and temperature sensor. Check your VIN against the recall database immediately — this is a free dealer fix. If you hear any unusual noise from the front of the engine, book an inspection without delay.

1. FEAD Belt Idler Pulley Issue (AJ20D6 Recall)

Symptoms: Unusual noise from front of engine, potential oil leak, warning lights — may affect engine oil pressure and temperature sensors.

Typical mileage: Any mileage — recall affects 2024–2026 model year vehicles.

Repair cost: £0 (if recalled — dealer repair free) / £300–£600 [PLACEHOLDER] (if out of warranty).

Replacement cost: N/A — repair only (pulley replacement, not full engine replacement).

🟠 Check - book inspection urgently if you hear unusual front-end noise.

Our recommendation:

2. Oil Filter Housing Cracking (Diesel Ingenium Family)

Symptoms: Oil leak, burning oil smell, oil warning light, visible oil pooling under the vehicle.

Typical mileage: 20,000–60,000 miles (varies).

Repair cost: £400–£1,200 [PLACEHOLDER] (oil filter housing replacement).

Replacement cost: N/A — repair only (if caught early; ignored oil loss can lead to engine damage).

🟠 Check - book inspection urgently if oil leak is detected.

Our recommendation:

On six-cylinder diesel (D200, D250, D300, D350) vehicles, an incorrect specification of plastic was used in the oil filter housing. This housing may crack over time, allowing oil under pressure to leak and potentially contact hot engine components — which could result in a fire. A recall affected 599 vehicles across 2020–2024 models. Ensure your vehicle's recall status is checked; this is a straightforward but critical fix.

3. Water Pump Pulley Drive Belt Damage (Ingenium Family)

Symptoms: Squealing from front of engine, coolant loss, overheating, warning lights.

Typical mileage: 20,000–60,000 miles.

Repair cost: £300–£800 [PLACEHOLDER] (belt and pulley replacement).

Replacement cost: N/A — repair only (belt replacement, not full engine replacement).

🟡 Monitor - book inspection soon if you hear belt noise.

Our recommendation:

A recall was issued for the water pump pulley drive belt, which may become damaged and detach. This affected 18,151 vehicles across 2020–2023 models. While the D350 is a newer engine and may have revised components, it shares the same Ingenium architecture. If you hear squealing from the front of the engine or notice coolant loss, have the belt inspected promptly.

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Defender D350 — 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 D350 — 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 issue✅ Yes (recall)£0–£600 [PLACEHOLDER]Recall repair is free; out-of-warranty repair still cheaper than engine replacementOil filter housing crack✅ Yes£400–£1,200 [PLACEHOLDER]Straightforward fix — always worth doingWater pump pulley/belt damage✅ Yes£300–£800 [PLACEHOLDER]Preventive maintenance — cheaper than engine damage from overheatingMajor internal failure (crank, bearings)❌ Usually No£3,500–£7,500+Full engine replacement often more cost-effectiveSevere turbocharger failure⚠️ Sometimes£1,500–£3,000 or replacementViable on higher-value examples; assess overall vehicle condition

Buying This Defender D350? Check These First

Buy If

All recalls are confirmed completed (FEAD pulley, oil filter housing)
Full Land Rover service history with documented oil changes
The vehicle has done regular longer runs (DPF-friendly mileage)
Warranty remaining or an extended warranty in place

Avoid If

No record of recall completion — these are critical safety items
Any sign of oil leak from the front or underside of the engine
Poor service history — this engine demands strict maintenance
Unusual noise from the front of the engine at any RPM

Closing Verdict

The Defender D350 represents the most powerful diesel engine ever fitted to a Defender. It's a significant step up from the D300, with 350PS and 700Nm of torque. However, as a relatively new engine (introduced May 2024), long-term reliability data is still emerging. Early recalls — particularly the FEAD belt idler pulley issue affecting AJ20-D6 engines— mean buyers should verify recall completion before purchase. When maintained correctly, this is a genuinely impressive, torquey diesel that transforms the Defender's on-road and towing capability.

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

→ Compare Defender D350 engine prices before you buy

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→ Compare Defender D350 engine prices before you buy

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Buying Checklist

Before you buy a used Land Rover Defender D350 (or before you commit to an engine replacement), check these:

1. Cold Start — Does it start cleanly? Any unusual noise from the front of the engine?

2. Service History — Full Land Rover main dealer history with correct oil spec (STJLR.03.5007)

3. Recall Status — FEAD pulley recall completed? Oil filter housing recall completed?

4. Oil Leaks — Check under the vehicle and around the oil filter housing for any signs of leakage

5. Belt Condition — Any squealing from the front of the engine? (water pump pulley belt)

6. DPF Regeneration — Has the vehicle done regular longer runs? Short journeys accelerate DPF wear

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

8. MOT History — Check for emissions-related failures or any advisory notes

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)

Years2024–present

Power350PS (258kW) / 700Nm

2025 Enquiries— (pattern data)

Avg. Recon Cost£3,800–£6,500 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

AJ20D6 (DT306)2024–present350PS (258kW) / 700Nm— (pattern data)£3,800–£6,500 [PLACEHOLDER]

Technical Specs

AJ20D6 Ingenium 3.0L Diesel

Displacement2,997cc (3.0L)

Cylinders6-cylinder inline

Compression Ratio[VERIFY]

Fuel SystemCommon-rail direct injection

TurbochargerTwin-turbocharged (sequential)

→ Compare Defender D350 engine prices for your Land Rover

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Market Intelligence

Most Common Failure

FEAD belt idler pulley recall — affects 2024–2026 AJ20-D6 engines

Average Enquiry Mileage

15,000

–30,000 miles (limited data — new engine)

[PATTERN DATA]

Average Replacement Cost

£4,500

reconditioned, supply only

[PLACEHOLDER]

Most Requested Engine Code

AJ20D6 (DT306) — sole D350 engine

[PATTERN DATA]

Peak Enquiry Season

Spring/Summer — new model year interest

[PATTERN DATA]

Regional Demand

South East20%

South West15%

Midlands (12%) — premium SUV strongholds

PATTERN DATA

Regional Demand Breakdown

20%South East

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 D350 Owners Trust LandRoverEngine.uk

Trusted D350 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, across the latest Ingenium diesel range including the new 350PS flagship.
Compare D350 Engine Replacement Companies
see prices, warranty terms and supply & fit options side‑by‑side before you commit, with specialists familiar with the AJ20D6's specific recall requirements.
UK Engine Replacement Services for the New Defender
supply‑only or full supply & fit available nationwide, covering the most powerful diesel Defender ever built, from 2024 onwards.

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As standard

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