Land Rover Garage - LAND ROVER ENGINE SPECIALISTS
Land Rover technician rebuilding an engine block

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

GB

Your Land Rover Defender D300 Engine

Land Rover turbocharged 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.

GB

DVLA & VIN verified

100% secure & private

No obligation quote

Land Rover Defender D300 Engine Rebuild Price

Starting From £2,800

AJ300D (D300) engine

Engine Code

AJ300D (D300)

Rebuild From

£2,800

L663 90/110/130

Generation

L663 90/110/130

Exact price depends on condition and parts required - submit your reg for a fixed-price quote.

Get Your 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 engine block

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.

01MOST POPULAR

REBUILDING YOUR DEFENDER D300 ENGINE

Most engine suppliers sell you a used engine of unknown history and hope it matches. We rebuild the engine your Defender D300 already has instead - strip it down, pressure-test it, and replace every worn or damaged component (timing chain, injector seals, bearings, gaskets, DC-DC converter) with updated OEM parts. You get a near-new engine with a 12-month unlimited-mileage warranty, without the compatibility risk of an unknown used unit. This is the option most Defender D300 owners choose, and it's the one we'd recommend for most situations.

From £2,800
02

RECONDITIONED DEFENDER D300 ENGINES

"Reconditioned" is the term many owners search for when they mean the same thing as a rebuild - a full strip-down, inspection, and replacement of worn parts rather than a straight swap. If that's what you're after, our rebuild service is exactly that.

Learn more
03

REFURBISHED DEFENDER D300 ENGINES

Similarly, "refurbished" often describes the same process from a different angle - restoring your existing engine to full working condition rather than replacing it outright. Our rebuild covers this.

Learn more
04

REMANUFACTURED DEFENDER D300 ENGINES

Some owners specifically search for a "remanufactured" engine, expecting a unit rebuilt to original specification with updated components. That's consistent with what our rebuild service delivers on the Ingenium AJ300D.

Learn more
05

REPLACEMENT DEFENDER D300 ENGINES

If your existing engine is beyond economical repair, we also offer full engine replacement and fitting - sourced and fitted by our team, with the same 12-month warranty.

Learn more
06

USED DEFENDER D300 ENGINES

In some cases, a matched low-mileage used engine is the right call - particularly if you need your car back on the road quickly and your existing engine's damage is extensive. We can source and fit these too, though most owners who ask about used engines end up choosing a rebuild once they understand the compatibility risk a used unit carries. Enter your reg below and we'll talk you through both options honestly.

Learn more

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 Options

OUR WORKSHOP

RECOVERY COLLECTION01

RECOVERY COLLECTION

Ingenium AJ300D ENGINE STRIPPED FOR REBUILD INSPECTION02

Ingenium AJ300D ENGINE STRIPPED FOR REBUILD INSPECTION

VALVE COVERS & COOLANT COMPONENT WORK03

VALVE COVERS & COOLANT COMPONENT WORK

TECHNICIANS AT WORK04

TECHNICIANS AT WORK

ENGINE TESTING (RIG)05

ENGINE TESTING (RIG)

COMPLETED & READY FOR REFIT06

COMPLETED & 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

1Diagnosis

We confirm your exact engine code and assess the damage.

2Removal

Your engine is removed and brought into our workshop.

3Strip-Down

Every component is removed for individual inspection.

4Inspection

Crankshaft, cylinder head, timing chain, bearings, water pump and gaskets are all checked.

5Machine Work

Any machining required is carried out to OEM tolerances.

6Component Replacement

Worn or damaged parts are replaced with updated OEM components.

7Reassembly

Your engine is rebuilt to original specification.

8Testing

Every rebuild is pressure-tested before refit.

9Refit

Your engine goes back into your Defender D300.

10Road Test

A full road test confirms everything's right before we hand your car back.

WHAT LAND ROVER Defender D300 OWNERS SAY

Daniel R.

“Brilliant service from start to finish. My Defender D300 runs smoother than ever. Honest advice, clear pricing and the team know their stuff.”

Land Rover Defender D300 Engine Rebuild

Mark T.

“They rebuilt my Ingenium AJ300D with all the updated parts. Smooth process and great communication throughout.”

Land Rover Defender D300 Engine Rebuild

Ryan P.

“Top lads, top job. Picked up and dropped off, engine rebuilt to an extremely high standard. 100% recommend.”

Land Rover Defender D300 Engine Rebuild

Steve B.

“Saved me thousands compared to a dealer quote. Fantastic workmanship and my Defender D300 is running perfectly.”

Land Rover Defender D300 Engine Rebuild

Tom H.

“From quote to collection couldn't fault them. Engine looks brand new inside. Warranty gives great peace of mind.”

Land Rover Defender D300 Engine Rebuild

James K.

“Professional, reliable and fairly priced. Sorted properly and kept me updated throughout.”

Land Rover Defender D300 Engine Rebuild

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.

GB
FastAccurateNo Guesswork

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

Land Rover Defender D300

RECOVERY

Land Rover Defender D300

Land Rover Defender D300

DIAGNOSTICS

Land Rover Defender D300

Land Rover Defender D300

STRIPPED ENGINE

Land Rover Defender D300

Land Rover Defender D300

TIMING CHAIN REPLACEMENT

Land Rover Defender D300

Land Rover Defender D300

IN FOR REBUILD

Land Rover Defender D300

Land Rover Defender D300

REBUILD IN PROGRESS

HOW IT WORKS

1

SEND YOURREGISTRATION

2

RECEIVE YOURFIXED-PRICE QUOTE

3

WE RECOVERYOUR CAR

4

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.

Ask About Used Engine Options

ABOUT THE Land Rover Defender D300 ENGINE

Land Rover engine and vehicle

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

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 D300

Land Rover Defender D300 ENGINE COMPATIBILITY

Land Rover Land Rover vehicle in workshop

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

Generation

Chassis

Years

Engine Code

Fuel

L663

L663

L663

2020-present

Ingenium AJ300D

Diesel MHEV

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.

Year

Generation

Engine Code

Fuel

Service

2020

L663

Ingenium AJ300D

Diesel MHEV

Rebuild / Replacement

2021

L663

Ingenium AJ300D

Diesel MHEV

Rebuild / Replacement

2022

L663

Ingenium AJ300D

Diesel MHEV

Rebuild / Replacement

2023

L663

Ingenium AJ300D

Diesel MHEV

Rebuild / Replacement

2024

L663

Ingenium AJ300D

Diesel MHEV

Rebuild / Replacement

2025

L663

Ingenium AJ300D

Diesel MHEV

Rebuild / Replacement

2026

L663

Ingenium AJ300D

Diesel MHEV

Rebuild / Replacement

i

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.

Land Rover engine

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

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.

Land Rover vehicle recovery and collection

FREQUENTLY ASKED QUESTIONS

Land Rover vehicle in a dark showroom

GET YOUR FREE LAND ROVER Defender D300 FIXED-PRICE QUOTE

Most quotes returned within 30 minutes during working hours.