
Land Rover Defender D350 Engine Rebuild - From £2,800
Specialist Land Rover Defender D350 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 AJ300D Specialists
Your Land Rover Defender D350 Engine

Vehicle
Land Rover Defender D350
Model
Defender
Variant
Defender D350
Fuel
Diesel MHEV
Engine
AJ300D
Capacity
3.0L I6
Generations
L663 (2019-present)
Rebuild From
£2,800
Not sure which engine you have?
The Defender D350 uses the 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 D350 Engine Rebuild Price
Starting From £2,800

Engine Code
AJ300DRebuild From
£2,800

Generation
L663 (2019-present)
Exact price depends on condition and parts required - submit your reg for a fixed-price quote.
Land Rover Defender D350 DC-DC Converter & Timing Chain
Defender D350 engines with the Ingenium AJ300D - fitted across the L663 generation - are part of the Ingenium diesel family. The timing chain pattern is well-documented across this engine family, and the DC-DC converter failure pattern applies to mild-hybrid variants (which the D350 is). The DC-DC converter is a single point of failure for the entire 12V electrical system - failure causes complete loss of electrical power, sometimes while driving. We replace the DC-DC converter, timing chain components, injector seals, bearings and gaskets as standard on every AJ300D rebuild.
Early production D350s (2019-2020) also show electrical injector faults, which we inspect and replace as part of the rebuild.
Source: verified via specialist buying guide (l663.guide), independently corroborated, per VRF-landrover-defender.md. Confirmed for AJ300D (D250/D300/D350) MHEV Ingenium variants. P300 (no MHEV) and Octa (BMW's own 48V hardware) explicitly excluded from this specific pattern

Land Rover Defender D350 ENGINE OPTIONS
Every Defender D350 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 AJ300D and talk you through the best solution for your Defender D350, honestly.
Ask About Your OptionsOUR WORKSHOP
01RECOVERY COLLECTION

02AJ300D 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 D350 rebuild looks like.
Land Rover Defender D350 ENGINE REBUILD PROCESS
WE COVER YOUR EXACT VEHICLE
Enter your registration below and we'll confirm your Land Rover Defender D350 has the AJ300D, along with an exact rebuild price.
WHY LAND ROVER Defender D350 OWNERS CHOOSE US
Engine matched using VIN or registration number
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 D350
RECOVERY

Land Rover Defender D350
DIAGNOSTICS

Land Rover Defender D350
STRIPPED ENGINE

Land Rover Defender D350
TIMING CHAIN REPLACEMENT

Land Rover Defender D350
IN FOR REBUILD

Land Rover Defender D350
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 Defender D350 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 D350 ENGINE

The Defender D350 is part of the modern L663 generation, launched in 2019. It uses the Ingenium AJ300D - a 3.0-litre inline-six diesel mild-hybrid. It's the highest-output diesel in the Defender range, positioned above the D250 and D300. The AJ300D is a genuine six-cylinder unit (not a 4-cylinder derivative), and it sits on a different price tier from the 4-cylinder Defender diesel variants.
We continue to rebuild and replace AJ300D engines for every Defender D350 on the road.
Land Rover Defender D350 ENGINE CODES
A 3.0-litre inline-six diesel MHEV fitted to the Defender D350 from 2019 to present (L663 generation). Known for the DC-DC converter failure pattern affecting the entire 12V electrical system on mild-hybrid variants, plus the broader Ingenium timing chain pattern. Early production (2019-2020) also shows electrical injector faults. We replace timing chain components, injector seals, bearings, gaskets and the DC-DC converter as standard on every AJ300D rebuild.
Check Your AJ300D Defender D350Land Rover Defender D350 ENGINE COMPATIBILITY

The Defender D350 uses the AJ300D across the entire L663 generation. When quoting or supplying an engine for your D350, we confirm:
Your exact engine code (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 D350 APPLICATIONS BY GENERATION
Land Rover Defender D350 ENGINES BY YEAR
Land Rover Defender D350 has used the AJ300D throughout. If you're unsure of your exact spec, we'll confirm it before you book.
The AJ300D has been fitted to every Defender D350 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 D350 MODEL YEAR:
Land Rover Defender D350
2019 Engine Rebuild
Land Rover Defender D350
2020 Engine Rebuild
Land Rover Defender D350
2021 Engine Rebuild
Land Rover Defender D350
2022 Engine Rebuild
Land Rover Defender D350
2023 Engine Rebuild
Land Rover Defender D350
2024 Engine Rebuild
Land Rover Defender D350
2025 Engine Rebuild
Land Rover Defender D350
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 D350 ENGINE COSTS
A Land Rover Defender D350 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 D350 ENGINE SIZES
• Land Rover Defender D350 3.0 Litre Engine (AJ300D, I6)
LAND ROVER Defender D350 FUEL TYPES
• Land Rover Defender D350 Petrol Mild Hybrid Engine Rebuilds
Related Land Rover Defender Variants
Most Land Rover Defender D350 engine rebuilds are completed within 3-5 working days.
Nationwide recovery and collection available for all Land Rover Defender D350 models.












