
Land Rover Defender D300 Engine Rebuild - From £2,800
Specialist Land Rover Defender D300 engine rebuilds and replacements, with registration-based engine matching, nationwide recovery and a 12-month unlimited-mileage warranty
Rated Land Rover Engine Specialists - 1,800+ Engines Rebuilt
Specialist technicians with 10-15 years of experience
12 Month Unlimited-Mileage Warranty
Nationwide Recovery
Free Engine Matching by Registration
Ingenium Ingenium AJ300D Specialists
Your Land Rover Defender D300 Engine

Vehicle
Land Rover Defender D300
Model
Defender
Variant
Defender D300
Fuel
Diesel MHEV
Engine
Ingenium AJ300D
Capacity
3.0L I6
Generations
L663 90/110/130 (2020-present)
Rebuild From
£2,800
Not sure which engine you have?
The Defender D300 uses the Ingenium AJ300D 3.0-litre inline-six mild-hybrid engine - enter your registration below and we'll confirm your exact spec before you get a quote.
DVLA & VIN verified
100% secure & private
No obligation quote
Land Rover Defender D300 Engine Rebuild Price
Starting From £2,800

Engine Code
AJ300D (D300)Rebuild From
£2,800

Generation
L663 90/110/130
Exact price depends on condition and parts required - submit your reg for a fixed-price quote.
Land Rover Defender D300 Known Issues
Defender D300 engines - the Ingenium AJ300D, fitted across the L663 generation - commonly show the Ingenium timing chain pattern over time, along with DC-DC converter failure on the MHEV system. We replace timing chain components, injector seals, bearings, gaskets and the DC-DC converter as standard on every D300 rebuild.
Early production D250/D300 models (2019-2020) also show electrical injector faults - we inspect and replace affected injectors as part of the rebuild where required.
Source: verified via specialist buying guide (l663.guide), independently corroborated. P300 (no MHEV system) and Octa (BMW's own 48V hardware) are NOT affected by the DC-DC converter pattern per VRF

Land Rover Defender D300 ENGINE OPTIONS
Every Defender D300 is different. That's why we offer the right solution for your engine, your car and your budget.
NOT SURE WHICH OPTION IS RIGHT FOR YOU?
Enter your registration below and we'll confirm your Ingenium AJ300D and talk you through the best solution for your Defender D300, honestly.
Ask About Your OptionsOUR WORKSHOP
01RECOVERY COLLECTION

02Ingenium AJ300D ENGINE STRIPPED FOR REBUILD INSPECTION

03VALVE COVERS & COOLANT COMPONENT WORK
04TECHNICIANS AT WORK
05ENGINE TESTING (RIG)
06COMPLETED & READY FOR REFIT
Real photos from our workshop - not stock imagery. This is what a genuine Land Rover Defender D300 rebuild looks like.
Land Rover Defender D300 ENGINE REBUILD PROCESS
WE COVER YOUR EXACT VEHICLE
Enter your registration below and we'll confirm your Land Rover Defender D300 has the Ingenium AJ300D, along with an exact rebuild price.
WHY LAND ROVER Defender D300 OWNERS CHOOSE US
Engine matched using VIN or registration number - confirms AJ300D specification before you're quoted
Genuine specialist workshop - not a broker
Specialist technicians with 10-15 years of experience
We don't swap your engine for an unknown used unit
Nationwide recovery, workshop rebuild
12 month unlimited-mileage warranty
All engine ancillaries serviced as part of the rebuild
Trade & public enquiries welcome
Dedicated advisor from quote to fit
OUR MOST RECENT LAND ROVER RECOVERIES & REBUILDS
Real vehicles brought into our workshop. Open bonnets, stripped blocks, and cars ready for collection - this is what genuine engine work looks like.

Land Rover Defender D300
RECOVERY

Land Rover Defender D300
DIAGNOSTICS

Land Rover Defender D300
STRIPPED ENGINE

Land Rover Defender D300
TIMING CHAIN REPLACEMENT

Land Rover Defender D300
IN FOR REBUILD

Land Rover Defender D300
REBUILD IN PROGRESS
HOW IT WORKS
SEND YOURREGISTRATION
RECEIVE YOURFIXED-PRICE QUOTE
WE RECOVERYOUR CAR
REBUILD &REFIT
Most Defender models are recovered within a few hours of booking. Most rebuilds are completed within 3-5 working days.
Workshop slots fill up fast - book your recovery today.
LOOKING FOR A USED OR REPLACEMENT ENGINE INSTEAD?
We supply low-mileage, VIN-matched used units too, and offer full replacement and fitting. However, most D300 owners choose a rebuild once they realise it removes compatibility risk and works out more cost-effective over the life of the car. Enter your reg below and we'll show you every option, honestly.
ABOUT THE Land Rover Defender D300 ENGINE

The Defender D300 sits in the modern L663-generation range, introduced in 2020 as a 3.0-litre six-cylinder diesel with mild-hybrid assistance. Using the Ingenium AJ300D, it replaced the earlier D240 as a more powerful and efficient option. The D300 is available across all three body styles - 90, 110 and 130 - and benefits from the 48V MHEV system that provides the DC-DC converter to manage the auxiliary electrical systems. It's one of the most popular diesel choices in the current Defender lineup, offering a balance of power and efficiency for both on-road and off-road use.
We continue to rebuild and replace Ingenium AJ300D engines for every Defender D300 on the road.
Land Rover Defender D300 ENGINE CODES

Ingenium AJ300D (D300)
A 3.0-litre inline-six diesel with mild-hybrid assistance, fitted to the L663 Defender from 2020 to present. Known for the Ingenium timing chain pattern, DC-DC converter failure on the MHEV system, and early production (2019-2020) electrical injector faults - see the callout above. We replace timing chain components, injector seals, bearings, gaskets and the DC-DC converter as standard on every AJ300D rebuild.
Check Your Ingenium AJ300D Defender D300Land Rover Defender D300 ENGINE COMPATIBILITY

The D300's AJ300D is fitted specifically to the L663-generation Defender, across all three body styles. Unlike earlier Defenders that used a range of different diesel engines (Td5, 300Tdi, 200Tdi), the L663 range uses a consistent engine architecture across its diesel options - the D200, D240, D250, D300 and D350 all share the same Ingenium AJ family design. However, the specific tuning, components and MHEV hardware vary between them, so we always confirm your exact D300 specification before quoting.
Your exact engine code (Ingenium AJ300D) via registration or VIN
Your generation (L663)
Drivetrain and ancillary specification
Whether your build falls in the early production period (2019-2020) for injector fault coverage
This is why we always start with your registration rather than a generic Defender quote - it protects you from paying for parts that don't fit your actual car.
Land Rover Defender D300 APPLICATIONS BY GENERATION
Land Rover Defender D300 ENGINES BY YEAR
Land Rover Defender D300 has used the Ingenium AJ300D throughout. If you're unsure of your exact spec, we'll confirm it before you book.
The Ingenium AJ300D has been fitted to every Defender D300 since launch - if your registration year isn't listed above, get in touch and we'll confirm availability directly against your reg.
WE COVER EVERY Land Rover Defender D300 MODEL YEAR:
Land Rover Defender D300
2020 Engine Rebuild
Land Rover Defender D300
2021 Engine Rebuild
Land Rover Defender D300
2022 Engine Rebuild
Land Rover Defender D300
2023 Engine Rebuild
Land Rover Defender D300
2024 Engine Rebuild
Land Rover Defender D300
2025 Engine Rebuild
Land Rover Defender D300
2026 Engine Rebuild
If your registration year or model isn't listed above, get in touch - we'll confirm availability directly against your reg.
Land Rover Defender D300 ENGINE COSTS
A Land Rover Defender D300 engine rebuild starts from
£2,800
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.

12 MONTH
UNLIMITED-MILEAGE
WARRANTY
LAND ROVER Defender D300 ENGINE SIZES
• Land Rover Defender D300 3.0 Litre Engine (Ingenium AJ300D, I6)
LAND ROVER Defender D300 FUEL TYPES
• Land Rover Defender D300 Petrol Mild Hybrid Engine Rebuilds
Related Land Rover Defender Variants
Most Land Rover Defender D300 engine rebuilds are completed within 3-5 working days.
Nationwide recovery and collection available for all Land Rover Defender D300 models.












