Land Rover Defender 90 P400 Engine ReplacementCompare Prices & Get Quotes
Get quotes today from trusted UK Land Rover Defender 90 P400 engine specialists. Compare prices on reconditioned, rebuilt and used engines to restore your high-performance mild-hybrid powertrain.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
From £6,500 to £10,000 [EM-QUOTE]
Used from £2,500 · Reconditioned from £4,500 · Common codes: AJ20P6
From £2,500
Tested, bare/short engine
From £4,500
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
Secure enquiry - no spam, no pressure. Genuine quotes only from vetted UK Land Rover Defender 90 P400 specialists.
3 Simple Steps3 Simple Stepsto Finding the Best Land Rover Defender 90 P400 Replacement Engineto Finding the Best Land Rover Defender 90 P400 Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryLand Rover Defender 90 P400 - Engine History & Specs at a Glance
Launched as the performance flagship of the new L663 generation, the Land Rover Defender 90 P400 pairs the iconic short-wheelbase agility with a potent 3.0-litre inline-six mild-hybrid petrol engine.
Variant HistoryLand Rover Defender 90 P400 - Engine History & Specs at a Glance
Launched as the performance flagship of the new L663 generation, the Land Rover Defender 90 P400 pairs the iconic short-wheelbase agility with a potent 3.0-litre inline-six mild-hybrid petrol engine.
Land Rover Defender 90 P400
Fuel TypePetrol (MHEV)
Engine Size Range3.0L
Power Output Range395hp (400PS) across the variant's historyEngine History Timeline
AJ20P6 (3.0L I6 MHEV Petrol) 395hp (400PS), launched with the new L663 Defender 90, featuring an innovative electric supercharger and traditional turbocharger setup.
Minor calibration updates to the 48V mild-hybrid system for improved efficiency smoother stop-start operation, and refined torque delivery.
Key Specs Snapshot
Fuel TypePetrol (MHEV)Engine Size Range3.0LPower Output Range395hp (400PS) across the variant's historyYears Produced2020-presentEvery engine fitted to the Land Rover Defender 90 P400 is covered below, with UK rebuilt pricing and known failure points.
Land Rover Defender 90 P400 Engine Codes - Specifications & Replacement CostLand Rover Defender 90 P400 Engine Codes - Specifications & Replacement Cost
3.0L Petrol MHEV (2020-present)
Power Output395hp (400PS)Years Fitted2020-present
Compatible Trim Levels
- Defender 90 P400
- Defender 90 P400 X-Dynamic
- Defender 90 P400 HSE
- Defender 90 P400 First Edition
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£2,500-£4,500
Reconditioned
Addressed known issues, tested
£4,500-£7,500
Rebuilt
Full teardown, upgraded internals
£6,500-£10,000
Common Failure
Cooling system vulnerabilities (electric water pump and plastic coolant crossover pipes) and occasional timing chain tensioner wear on early production units, typically emerging between 60,000-120,000 miles.
The 3.0L Ingenium inline-six in the Land Rover Defender 90 P400 is a complex, high-performance unit. While generally robust, its dual-charging system (electric supercharger + turbo) and cooling architecture require precise maintenance. Rebuilt engines through EnginesMarket include upgraded components addressing these original failure points, backed by a minimum 12-month unlimited-mileage warranty.
Why the Land Rover Defender 90 P400 AJ20P6 Requires Attention
Affected Vehicles
Land Rover Defender 90 P400 (AJ20P6, 2020-present)
Typical Failure Mileage
60,000-120,000 miles
Root Cause
Plastic coolant crossover pipes and electric water pump components can degrade under repeated heat cycles, leading to coolant loss and potential overheating.
Why It Happens
Plastic coolant crossover pipes and electric water pump components can degrade under repeated heat cycles, leading to coolant loss and potential overheating.
Dealer (parts + labour)
£800-£1,500
Specialist (parts + labour)
£500-£900
What it involves
Coolant flush, electric water pump inspection, and seal replacement
Suitability
Highly suitable for minor leaks before overheating occurs
1 - 2 daysDealer (parts + labour)
£9,000-£13,000
Specialist (parts + labour)
£6,500-£10,000 [EM-QUOTE]
What it involves
Supply & fit of a rebuilt 3.0L I6 with upgraded cooling components and 12-month warranty
Suitability
Necessary if coolant loss has caused severe overheating and warped components
1 - 2 daysAll prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 Preventative Cooling System Service Minor | £800-£1,500 | £500-£900 | Coolant flush, electric water pump inspection, and seal replacement | Highly suitable for minor leaks before overheating occurs | 1 - 2 days |
 Full Replacement - rebuilt/reconditioned engine Best Value | £9,000-£13,000 | £6,500-£10,000 [EM-QUOTE] | Supply & fit of a rebuilt 3.0L I6 with upgraded cooling components and 12-month warranty | Necessary if coolant loss has caused severe overheating and warped components | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical Land Rover Defender 90 P400 holds a current UK market value of £65,000-£90,000+ depending on specification and mileage [THIRD-PARTY]. At this valuation, a rebuilt engine replacement cost represents a small fraction of the vehicle's total value, making professional replacement highly viable to preserve its premium status.
Our Recommendation
Our Recommendation
Proactive replacement of the electric water pump and coolant crossover pipes is a highly recommended, low-cost preventative measure. If overheating has already occurred, a full rebuilt engine replacement is the safest and most reliable solution.
Don't Let Engine Failure Write Off Your Land Rover Defender 90 P400
Protect your premium investment with a fully rebuilt Land Rover Defender 90 P400 engine. Our network supplies units with upgraded components that address known failure points, backed by a minimum 12-month unlimited-mileage warranty and nationwide delivery. Avoid main dealer premiums by comparing transparent, itemised quotes from vetted UK specialists today.
Compare rebuilt AJ20P6 Land Rover Defender 90 P400 engine prices
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
"All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific Land Rover Defender 90 P400. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
Land Rover Defender 90 P400 Engine ReplacementFrequently Asked Questions
Question 1How much does a Land Rover Defender 90 P400 engine replacement cost-
A complete rebuilt Land Rover Defender 90 P400 engine typically costs between £6,500 and £10,000 for supply only [EM-QUOTE].
- Used units start from around £2,500.
- Reconditioned units range from £4,500 to £7,500.
- Prices vary based on the specific AJ20P6 engine code and supplier.
Question 2What are the signs of cooling or timing chain failure in a Defender 90 P400-
Early warning signs include unexplained coolant loss, a sweet smell from the engine bay, or a distinct rattling noise during cold starts.
- Dashboard warning lights for engine temperature or low coolant.
- Loss of low-end torque or hesitation under acceleration.
- Metallic debris in the engine oil (in severe timing chain cases).
Question 3Is it worth replacing the engine in a Land Rover Defender 90 P400-
Yes, absolutely. The Land Rover Defender 90 P400 is a high-value performance SUV with current market values ranging from £65,000 to over £90,000 [THIRD-PARTY].
- A rebuilt engine cost is a small fraction of the vehicle's total value.
- It preserves the car's performance, refinement, and resale value.
- Upgraded rebuilt units address known factory cooling and timing weaknesses.
Question 4How long does a Land Rover Defender 90 P400 engine supply and fit take-
A professional Land Rover Defender 90 P400 engine replacement typically takes 3 to 5 working days.
- Removal and preparation of the old unit takes 1-2 days.
- Fitting, calibration, and 48V MHEV system testing of the new rebuilt engine takes 2-3 days.
- Nationwide collection and delivery are arranged by the specialist.
Question 5Do rebuilt P400 engines retain the 48V mild-hybrid (MHEV) functionality-
Yes, reputable specialists rebuilding a Land Rover Defender 90 P400 engine ensure full compatibility with the 48V mild-hybrid architecture.
- The electric supercharger and integrated starter-generator (ISG) are tested and calibrated.
- All MHEV software maps are retained or updated to factory specifications.
- This ensures seamless stop-start operation and torque-fill performance.
Why Choose UsCompare Land Rover Defender 90 P400Engine PricesToday
100+ Land Rover Defender 90 P400 engines supplied through our network
12-Month Warranty on every rebuilt Land Rover Defender 90 P400 engine
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