Range Rover Sport P400 Specialists

Range Rover Sport P400 Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK Range Rover Sport P400 engine specialists. Compare prices on reconditioned, rebuilt and used engines to secure a reliable, warranty-backed powertrain solution for your premium SUV.

Supply & Fit Available

12-Month Warranty

Nationwide Delivery

100+ Suppliers

Range Rover Sport P400 Engine

from£4,500 to £7,000...

Usedfrom £2,500
Reconditionedfrom £3,500
Common codesAJ300

Land Rover range-rover-sport P400 Used Engine — AJ300

Land Rover range-rover-sportUsed Engine — AJ300

Land Rover range-rover-sport P400 Reconditioned Engine — AJ300

Land Rover range-rover-sportReconditioned Engine — AJ300

Land Rover range-rover-sport P400 Rebuilt Engine — AJ300

Land Rover range-rover-sportRebuilt Engine — AJ300

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

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

Range Rover Sport P400 Engine History & Specs at a Glance

Launched in 2019 for the L494 facelift and continued into the modern L461 generation, the Range Rover Sport P400 brought refined 400PS inline-six performance with 48V mild-hybrid assistance, replacing the older supercharged V6 for improved efficiency and response.

2019
AJ300 engine code introduced, 3.0L, 400PS (Introduced in the L494 facelift, featuring a twin-scroll turbocharger and a 48V electric supercharger for instant throttle response).
2022
AJ300 engine code continued in the all-new L461 generation, featuring refined thermal management, updated direct injection calibration, and enhanced 48V MHEV software integration.

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

Engine Codes & Pricing

Range Rover Sport P400 Engine Codes Specifications & Replacement Cost

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

AJ300 — 3.0L Petrol (2019-present)

Power Output: 400PS
Years Fitted: 2019-present

Can’t find your exact engine code?-> Get quotes for AJ300 Range Rover Sport P400 engine replacement

-> Get quotes for AJ300 Range Rover Sport P400 engine replacement

Common failure points and repair options

Ignition Coil & Injector Coking

Affected: Range Rover Sport P400 (AJ300, 2019-present)
Typical failure mileage: 40,000-80,000 miles

Root cause

Direct injection leads to carbon buildup on intake valves and injector tips. Combined with the high thermal load of the twin-scroll turbo and electric supercharger, this accelerates ignition coil degradation, causing misfires, rough idling, and check engine lights (codes P0300-P0306).

Repair options

Repair tier	Dealer price	Specialist price
Minor/Preventative	£600-£1,200	£400-£800
Full Replacement - rebuilt/reconditioned engine	£9,000-£12,000	£6,500-£8,500

Our recommendation

If your Range Rover Sport P400 is exhibiting early signs of misfiring or rough idling, a targeted preventative repair (coil replacement and carbon cleaning) is highly cost-effective. However, if the engine has suffered from prolonged neglect, severe injector coking, or concurrent 48V system faults, a full rebuilt unit is the only reliable long-term solution to protect your investment.

-> Compare rebuilt AJ300 Range Rover Sport P400 engine prices

Don't Let Engine Failure Write Off Your Range Rover Sport P400

Protect your premium SUV investment by comparing quotes from vetted UK specialists. Every replacement engine sourced through our network features upgraded components to resolve known AJ300 weaknesses, backed by a minimum 12-month unlimited mileage warranty and nationwide delivery options. Avoid main dealer premiums and secure a reliable, cost-effective solution today.

Compare Range Rover Sport P400 Engine Replacement Prices Now ->

FAQ

Range Rover Sport P400 Engine ReplacementFrequently Asked Questions

Everything Range Rover Sport P400 owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

A full rebuilt Range Rover Sport P400 engine typically costs between £4,500 and £7,000 for supply only. Reconditioned units start around £3,500, while used engines can be found from £2,500. Prices vary based on whether you choose supply-only or a full supply and fit service.

Rebuilt engines include upgraded ignition coils and injector components.
Supply and fit adds approximately £650-£910 in specialist labour.
All rebuilt options include a 12-month unlimited mileage warranty.

-> Compare Range Rover Sport P400 engine replacement prices today.

Early warning signs include a rough idle, hesitation under acceleration, and an illuminated check engine light (often with misfire codes P0300-P0306). You might also notice reduced fuel economy or a slight loss of power due to direct injector coking.

Monitor for unusual engine vibrations at idle.
Address check engine lights immediately to prevent catalytic converter damage.
Regular use of high-quality fuel can help mitigate carbon buildup.

-> Get quotes for a rebuilt Range Rover Sport P400 engine if symptoms persist.

Yes, given the current premium vehicle market. A well-maintained Range Rover Sport P400 holds a value of £25,000 to £75,000+. Investing £4,500-£7,000 in a rebuilt engine with a 12-month warranty is financially viable and protects the appreciating asset value of this premium SUV.

Rebuilt engines resolve known AJ300 design vulnerabilities.
Warranty coverage provides long-term peace of mind.
Preserves the vehicle's premium status and resale value.

-> Check your Range Rover Sport P400 registration for an instant quote.

The AJ300 is the specific 3.0-litre inline-six Ingenium petrol engine code fitted to the Range Rover Sport P400 (producing 400PS). It features advanced direct injection, a twin-scroll turbocharger, and a 48V mild-hybrid electrical system (MHEV) for improved efficiency and torque fill.

Produces 400PS (294kW) and 550Nm of torque.
Shares architecture with other modern JLR models (Defender, Range Rover, Velar).
Requires strict adherence to premium fuel and specific oil specifications.

-> Compare quotes for your specific Range Rover Sport P400 engine code.

The AJ300 engine in the Range Rover Sport P400 is integrated with a 48V Belt-integrated Starter Generator (BiSG). Replacing the engine requires specialist high-voltage safety protocols and precise software recalibration to ensure the combustion engine and MHEV system communicate correctly with the ECU.

Requires MHEV-certified technicians.
Software recalibration is mandatory post-installation.
The 48V battery and starter-generator are usually retained and tested.

-> Book your Range Rover Sport P400 supply and fit appointment today.

Why Choose Us

Compare Range Rover Sport P400 Engine Prices Today

Comparing quotes is completely free and carries no obligation. By entering your registration, you ensure that every quote you receive is tailored specifically to your Range Rover Sport P400 and its exact AJ300 engine code, connecting you directly with vetted UK specialists who hold the right parts in stock.

500+500+ Range Rover Sport P400 engines supplied through our network

12-Month12-Month Warranty on every rebuilt Range Rover Sport P400 engine

NationwideNationwide UK delivery

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Compare quotes from trusted UK Range Rover Sport P400 engine specialists with warranty-backed rebuilt, reconditioned and used options nationwide.