The Range Rover P400 uses the AJ300P — a 3.0-litre inline-six petrol mild-hybrid engine. It was introduced with the L460 generation from 2022 and remains in production. The AJ300P is part of JLR's Ingenium engine family and represents a more modern design than the older TDV6/SDV6 diesel units that preceded it in the Range Rover line-up. The P400 badge denotes the power output tier within the petrol range. Range Rover P400 Engine Specifications AJ300P A 3.0-litre inline-six petrol fitted to the Range Rover P400 from 2022 onwards (L460 generation). The AJ300P is a modern Ingenium design with mild-hybrid assist. No specific known issue confirmed for this engine application, though the shared MHEV DC-DC converter pattern affecting other Ingenium MHEV variants is noted as a potential risk — but has not been independently confirmed for the Range Rover P400. Check Your AJ300P Range Rover P400 → [link to quote form] Range Rover P400 Engine Compatibility Because the Range Rover P400 uses a specific engine code (AJ300P) within the broader Ingenium family, fitting the wrong replacement or assuming parts compatibility with other variants risks a problem that's expensive to unpick. Before we quote or supply anything, we confirm: Your exact engine code (AJ300P) via registration or VIN Your generation (L460) Drivetrain and ancillary specification Any electronics or ECU considerations specific to your exact build This is why we always start with your registration rather than a generic P400 quote — it protects you from paying for parts that don't fit your actual car. Range Rover P400 Applications by Generation Generation Chassis Years Engine Code Fuel L460 L460 2022–present AJ300P Petrol MHEV Land Rover Range Rover P400 Engines by Year Year Generation Engine Code Fuel Service 2022 L460 AJ300P Petrol MHEV Rebuild / Replacement 2023 L460 AJ300P Petrol MHEV Rebuild / Replacement 2024 L460 AJ300P Petrol MHEV Rebuild / Replacement 2025 L460 AJ300P Petrol MHEV Rebuild / Replacement 2026 L460 AJ300P Petrol MHEV Rebuild / Replacement We Cover Every Land Rover Range Rover P400 Model Year: ✓ Land Rover Range Rover P400 2022 Engine Rebuild ✓ Land Rover Range Rover P400 2023 Engine Rebuild ✓ Land Rover Range Rover P400 2024 Engine Rebuild ✓ Land Rover Range Rover P400 2025 Engine Rebuild ✓ Land Rover Range Rover P400 2026 Engine Rebuild If your registration year isn't listed above, get in touch — we'll confirm availability directly against your reg. Land Rover Range Rover P400 Engine Sizes ✓ Land Rover Range Rover P400 3.0 Litre Engine (AJ300P, I6) Land Rover Range Rover P400 Fuel Types ✓ Land Rover Range Rover P400 Petrol MHEV Engine Rebuilds Land Rover Range Rover P400 Engine Costs A Land Rover Range Rover P400 engine rebuild starts from £3,200. A full replacement engine and fitting service is also available. Exact pricing depends on the condition of your existing engine and the parts required — submit your registration for a fixed-price quote within 30 minutes. Related Land Rover Range Rover Variants Looking for a different Range Rover engine? We also cover: [Range Rover SDV6 Engine →] · [Range Rover TDV8 Engine →] · [Range Rover SDV8 Engine →] · [Range Rover D300/D350 Engine →] · [Range Rover P530 Engine →] · [Range Rover SV/P615 Engine →] [← View All Land Rover Range Rover Engines] Frequently Asked Questions What engine does the Land Rover Range Rover P400 use? The Range Rover P400 uses the AJ300P — a 3.0-litre inline-six petrol mild-hybrid engine. It's part of JLR's Ingenium engine family and was introduced with the L460 generation from 2022. How much does a Land Rover Range Rover P400 engine rebuild cost? Rebuilds start from £3,200. Exact price depends on condition and parts required — submit your reg for a fixed-price quote. Which engine code is fitted to my Range Rover P400? The Range Rover P400 uses the AJ300P engine code. Enter your registration on this page and we'll confirm your exact spec before you're quoted anything. Do you rebuild AJ300P Range Rover P400 engines? Yes. We replace timing chains, bearings and gaskets as standard on every AJ300P rebuild. Do you supply used Range Rover P400 engines? Yes, in some cases a matched low-mileage used engine is the right option. Our team will advise honestly once we've matched your registration and understood your situation. Can you recover my Range Rover P400 if the engine has failed? Yes — nationwide recovery is available from £70, and most vehicles are collected within a few hours of booking. How long does a Range Rover P400 engine rebuild take? Most rebuilds are completed within 3-5 working days from the time your car arrives at our workshop. Is rebuilding better than fitting a used engine? For most Range Rover P400 owners, yes. A rebuild removes the compatibility risk that comes with an unknown used unit's history, and comes with a 12-month unlimited-mileage warranty — often longer and more comprehensive than what a used engine supplier offers. <a name="quote-form"></a> Get Your Free Land Rover Range Rover P400 Fixed-Price Quote [Quote Form: Registration Number | Postcode | Name | Phone | Email | Issue/Enquiry Type (dropdown: Engine Failure / Replacement Needed / General Enquiry) | Submit] Most quotes returned within 30 minutes during working hours. json { "@context": "https://schema.org", "@graph": [ { "@type": "Organization", "@id": "https://landrovergarage.co.uk#organization", "name": "Land Rover Garage", "url": "https://landrovergarage.co.uk", "email": "info@landrovergarage.co.uk", "telephone": "+44 01268 944 234", "sameAs": [ "https://facebook.com/landroverrebuildgarageuk", "https://twitter.com/landroverrebuildgarageuk", "https://instagram.com/landroverrebuildgarageuk", "https://tiktok.com/@landroverrebuildgarageuk" ] }, { "@type": "AutoRepair", "@id": "https://landrovergarage.co.uk#autorepair", "name": "Land Rover Garage – Range Rover P400 Engine Rebuild Specialists", "url": "https://landrovergarage.co.uk/range-rover-p400-engines", "telephone": "+44 01268 944 234", "email": "info@landrovergarage.co.uk", "priceRange": "£££", "address": { "@type": "PostalAddress", "streetAddress": "Unit A5 Windsor Road, Commercial Estate, Ramsden Heath", "addressLocality": "Billericay", "postalCode": "CM11 1QE", "addressCountry": "GB" }, "openingHours": "Mo-Fr 09:00-18:00, Sa 11:00-14:00", "areaServed": "GB", "parentOrganization": { "@id": "https://landrovergarage.co.uk#organization" }, "brand": { "@type": "Brand", "name": "Land Rover" } }, { "@type": "Service", "serviceType": "Land Rover Range Rover P400 Engine Rebuild & Replacement", "provider": { "@type": "AutoRepair", "name": "Land Rover Garage" }, "areaServed": "GB", "offers": { "@type": "Offer", "priceCurrency": "GBP", "price": "3200", "description": "Land Rover Range Rover P400 engine rebuild starting price, AJ300P" } }, { "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "What engine does the Land Rover Range Rover P400 use?", "acceptedAnswer": { "@type": "Answer", "text": "The Range Rover P400 uses the AJ300P — a 3.0-litre inline-six petrol mild-hybrid engine. 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We replace timing chains, bearings and gaskets as standard on every AJ300P rebuild." } }, { "@type": "Question", "name": "Do you supply used Range Rover P400 engines?", "acceptedAnswer": { "@type": "Answer", "text": "Yes, in some cases a matched low-mileage used engine is the right option. Our team will advise honestly once we've matched your registration and understood your situation." } }, { "@type": "Question", "name": "Can you recover my Range Rover P400 if the engine has failed?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — nationwide recovery is available from £70, and most vehicles are collected within a few hours of booking." } }, { "@type": "Question", "name": "How long does a Range Rover P400 engine rebuild take?", "acceptedAnswer": { "@type": "Answer", "text": "Most rebuilds are completed within 3-5 working days from the time your car arrives at our workshop." } }, { "@type": "Question", "name": "Is rebuilding better than fitting a used engine?", "acceptedAnswer": { "@type": "Answer", "text": "For most Range Rover P400 owners, yes. A rebuild removes the compatibility risk that comes with an unknown used unit's history, and comes with a 12-month unlimited-mileage warranty — often longer and more comprehensive than what a used engine supplier offers." } } ] } ] }

We continue to rebuild and replace AJ300P engines for every Range Rover P400 on the road.