How 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.

What 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).

Is 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.

How 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.

Do 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.

Land Rover Defender 90 P400 SPECIALISTS

Land Rover Defender 90 P400 Engine Replacement Compare 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

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Land Rover Defender 90 P400 Engine

from£6,500 to £10,00...

Usedfrom £2,500
Reconditionedfrom £4,500
Common codesAJ20P6

Land Rover defender-90 P400 Used Engine — AJ20P6

Land Rover defender-90Used Engine — AJ20P6

Land Rover defender-90 P400 Reconditioned Engine — AJ20P6

Land Rover defender-90Reconditioned Engine — AJ20P6

Land Rover defender-90 P400 Rebuilt Engine — AJ20P6

Land Rover defender-90Rebuilt Engine — AJ20P6

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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

Land 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.

2020
AJ20P6 (3.0L I6 MHEV Petrol), 395hp (400PS), launched with the new L663 Defender 90, featuring an innovative electric supercharger and traditional turbocharger setup.
2023
Minor calibration updates to the 48V mild-hybrid system for improved efficiency, smoother stop-start operation, and refined torque delivery.

Every engine fitted to the Land Rover Defender 90 P400 is covered below, with UK rebuilt pricing and known failure points.

Engine Codes & Pricing

Land Rover Defender 90 P400 Engine Codes Specifications & Replacement Cost

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

AJ20P6 — 3.0L Petrol MHEV (2020-present)

Power Output: 395hp (400PS)
Years Fitted: 2020-present

Can’t find your exact engine code?-> Get quotes for AJ20P6 Land Rover Defender 90 P400 engine replacement

-> Get quotes for AJ20P6 Land Rover Defender 90 P400 engine replacement

Common failure points and repair options

Cooling System & Water Pump Vulnerability

Affected: 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.

Repair options

Repair tier	Dealer price	Specialist price
Preventative Cooling System Service	£800-£1,500	£500-£900
Full Replacement - rebuilt/reconditioned engine	£9,000-£13,000	£6,500-£10,000 [EM-QUOTE]

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.

-> Compare rebuilt AJ20P6 Land Rover Defender 90 P400 engine prices

Timing Chain Tensioner & Dual-Charging Wear

Affected: Land Rover Defender 90 P400 (AJ20P6, 2020-present)
Typical failure mileage: 80,000-120,000 miles

Root cause

The complex timing chain arrangement and electric supercharger isolator coupler can experience wear over time, leading to rattling on cold starts or a loss of low-end torque.

Repair options

Repair tier	Dealer price	Specialist price
Timing Chain & Supercharger Service	£2,500-£4,500	£1,500-£3,000
Full Replacement - rebuilt/reconditioned engine	£9,000-£13,000	£6,500-£10,000 [EM-QUOTE]

Our recommendation

If caught early, a specialist timing chain and supercharger coupler service is the most cost-effective route. However, if the engine has suffered catastrophic failure due to neglected chain wear, investing in a fully rebuilt unit is the only way to guarantee long-term reliability.

-> Compare rebuilt AJ20P6 Land Rover Defender 90 P400 engine prices

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 Land Rover Defender 90 P400 Engine Replacement Prices Now ->

FAQ

Land Rover Defender 90 P400 Engine ReplacementFrequently Asked Questions

Everything Land Rover Defender 90 P400 owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

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).

-> If you notice these signs, book a specialist inspection immediately to prevent catastrophic damage.

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.

-> Secure your investment with a rebuilt Land Rover Defender 90 P400 engine.

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.

-> Enter your registration to confirm MHEV compatibility for your Land Rover Defender 90 P400.

Why Choose Us

Compare Land Rover Defender 90 P400 Engine Prices Today

Comparing quotes for your Land Rover Defender 90 P400 is completely free and carries no obligation. By entering your registration, you ensure that every quote you receive is precisely matched to your specific AJ20P6 engine code, guaranteeing compatibility and peace of mind from vetted UK premium Land Rover specialists.

100+100+ Land Rover Defender 90 P400 engines supplied through our network

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