Range Rover Sport P400 Engine ReplacementCompare 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
From £4,500 to £7,000 [EM-QUOTE]
Used from £2,500 · Reconditioned from £3,500 · Common codes: AJ300
From £2,500
Tested, bare/short engine
From £3,500
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
Secure enquiry - no spam, no pressure. Genuine quotes only from vetted UK Range Rover Sport P400 specialists.
3 Simple Steps3 Simple Stepsto Finding the Best Range Rover Sport P400 Replacement Engineto Finding the Best Range Rover Sport P400 Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryRange 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.
Variant HistoryRange 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.
Range Rover Sport P400
Fuel TypePetrol (MHEV)
Engine Size Range3.0L (2996cc)
Power Output Range400PS (294kW)Engine History Timeline
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).
AJ300 engine code continued in the all-new L461 generation featuring refined thermal management, updated direct injection calibration, and enhanced 48V MHEV software integration.
Key Specs Snapshot
Fuel TypePetrol (MHEV)Engine Size Range3.0L (2996cc)Power Output Range400PS (294kW)Years Produced2019-presentEvery engine fitted to the Range Rover Sport P400 is covered below, with UK rebuilt pricing and known failure points.
Range Rover Sport P400 Engine Codes - Specifications & Replacement CostRange Rover Sport P400 Engine Codes - Specifications & Replacement Cost
3.0L Petrol (2019-present)
Power Output400PSYears Fitted2019-present
Compatible Trim Levels
- P400
- P400 HSE
- P400 R-Dynamic SE
- P400 Autobiography
- 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
£3,500-£5,800
Rebuilt
Full teardown, upgraded internals
£4,500-£7,000
Common Failure
Ignition coil failure, direct injector coking, and fuel injector deposits leading to lean misfires under load, typically occurring between 40,000 and 80,000 miles.
The Range Rover Sport P400 utilises the modern 3.0-litre Ingenium inline-six petrol (AJ300), which offers strong performance and mild-hybrid efficiency but has documented vulnerabilities. Rebuilt engines sourced through EnginesMarket include upgraded components addressing these original failure points, backed by a minimum 12-month unlimited-mileage warranty.
Why the Range Rover Sport P400 AJ300 Wears Prematurely
Affected Vehicles
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).
Why It Happens
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).
Dealer (parts + labour)
£600-£1,200
Specialist (parts + labour)
£400-£800
What it involves
Ignition coil replacement, walnut blasting for carbon removal, and software updates
Suitability
Suitable for early-stage misfires without internal mechanical damage
1 - 2 daysDealer (parts + labour)
£9,000-£12,000
Specialist (parts + labour)
£6,500-£8,500
What it involves
Supply & fit, revised injectors, upgraded coils, and 48V system diagnostic check, 12-month warranty
Suitability
The definitive solution for persistent misfires, severe coking, or concurrent 48V integration faults
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 |
|---|---|---|---|---|---|
 Minor/Preventative Minor | £600-£1,200 | £400-£800 | Ignition coil replacement, walnut blasting for carbon removal, and software updates | Suitable for early-stage misfires without internal mechanical damage | 1 - 2 days |
 Full Replacement - rebuilt/reconditioned engine Best Value | £9,000-£12,000 | £6,500-£8,500 | Supply & fit, revised injectors, upgraded coils, and 48V system diagnostic check, 12-month warranty | The definitive solution for persistent misfires, severe coking, or concurrent 48V integration faults | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical Range Rover Sport P400 in good condition currently holds a UK market value of approximately £25,000 to £75,000+ [THIRD-PARTY], depending on mileage, specification, and model year. - Vehicle worth under ~£5,000: repair or used engine typically makes more sense than a full rebuilt unit. - Vehicle worth ~£5,000-£8,000: evaluate both; reconditioned is viable if keeping the car 2+ years. - Vehicle worth ~£8,000-£15,000: reconditioned/rebuilt usually justifies the premium via warranty and reliability. - Vehicle worth £15,000+: replacement cost is typically small relative to vehicle value. Given the premium valuation of the P400, a rebuilt or reconditioned engine is a financially sound investment that protects the vehicle's strong retained asset value.
Our Recommendation
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.
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 rebuilt AJ300 Range Rover Sport 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 Range Rover Sport P400. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
Range Rover Sport P400 Engine ReplacementFrequently Asked Questions
Question 1How much does a Range Rover Sport P400 engine replacement cost-
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.
Question 2What are the signs of ignition or injector failure in a Range Rover Sport P400-
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.
Question 3Is it worth replacing the engine in a Range Rover Sport P400-
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.
Question 4What is the AJ300 engine code in the Range Rover Sport P400-
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.
Question 5How does the 48V mild-hybrid system affect a Range Rover Sport P400 engine replacement-
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.
Why Choose UsCompare Range Rover Sport P400Engine PricesToday
500+ Range Rover Sport P400 engines supplied through our network
12-Month Warranty on every rebuilt Range Rover Sport P400 engine
Nationwide UK delivery
supply & fit available
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.
Enter your registration
and get matched with verified Range Rover Sport P400 specialists.