Land RoverLAND ROVER GARAGELAND ROVER ENGINE SPECIALISTS
Land Rover technician rebuilding a AMG GT 53 engine block
Land Rover

Land Rover Defender P425Engine Rebuild— From £4,500

Specialist Land Rover Defender P425 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

AJ133 Supercharged V8 Specialists

GB
Land Rover

Your Land Rover Defender P425 Engine

Land Rover AMG GT 53 TwinPower Turbo engine

Vehicle

Land Rover Defender P425

Model

Defender

Variant

P425

Fuel

Petrol Supercharged

Engine

AJ133

Capacity

5.0L V8

Generations

L663 (2024)

Rebuild From

£4,500

?

Not sure which engine you have?

The Defender P425 uses the AJ133 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 P425Engine Rebuild Price

Starting From £4,500

AJ133 engine

Engine Code

AJ133

Rebuild From

£4,500

Generation

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

Get Your Fixed-Price Quote

Land Rover Defender P425 Oil Leaks & Coolant System Wear (AJ133 I6)

The AJ133 is a sophisticated 3.0-litre inline-six with an integrated starter-generator and electric auxiliary compressor — a more modern and efficient design than the older AJ133 V6. We replace timing chains, bearings, water pump and gaskets as standard on every AJ133 rebuild.

Because the Defender P425 uses a completely different engine family from the V8 M178 fitted to the Defender 63 and GT 63 S, parts and rebuild specifications don't cross over between them.

Source: Established AJ133 specialist pattern — timing chain, bearing and gasket wear across integrated-starter-generator inline-six units.

Land Rover AMG GT 53 engine block

Land Rover Defender P425ENGINE OPTIONS

Every Defender P425 is different. That's why we offer the right solution for your engine, your car and your budget.

01MOST POPULAR

REBUILDING YOUR DEFENDER P425 ENGINE

Most engine suppliers sell you a used engine of unknown history and hope it matches. We rebuild the engine your Defender P425 already has instead — strip it down, pressure-test it, and replace every worn or damaged component (timing chains, bearings, water pump, gaskets) 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 P425 owners choose, and it's the one we'd recommend for most situations.

02

RECONDITIONED DEFENDER P425 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.

03

REFURBISHED DEFENDER P425 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.

04

REMANUFACTURED DEFENDER P425 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 AJ133.

05

REPLACEMENT DEFENDER P425 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.

06

USED DEFENDER P425 ENGINES

In some cases, a matched low-mileage used engine is the right call — particularly if you need your vehicle 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.

NOT SURE WHICH OPTION IS RIGHT FOR YOU?

Enter your registration below and we'll confirm your AJ133 and talk you through the best solution for your Defender P425, honestly.

Ask About Your Options

OUR WORKSHOP

RECOVERY COLLECTION01

RECOVERY COLLECTION

AJ133 ENGINE STRIPPED FOR REBUILD INSPECTION02

AJ133 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 P425 rebuild looks like.

Land Rover Defender P425 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 P425.

10Road Test

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

WHAT MERCEDES Defender P425 OWNERS SAY

Daniel R.

Brilliant service from start to finish. My Defender P425 runs smoother than ever. Honest advice, clear pricing and the team know their stuff.

Land Rover Defender P425 Engine Rebuild

Mark T.

They rebuilt my AJ133 with all the updated parts. Smooth process and great communication throughout.

Land Rover Defender P425 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 P425 Engine Rebuild

Steve B.

Saved me thousands compared to a dealer quote. Fantastic workmanship and my Defender P425 is running perfectly.

Land Rover Defender P425 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 P425 Engine Rebuild

James K.

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

Land Rover Defender P425 Engine Rebuild

WE COVER YOUREXACT VEHICLE

Enter your registration below and we'll confirm your Land Rover Defender P425 has the AJ133, along with an exact rebuild price.

GB
FastAccurateNo Guesswork

WHY MERCEDES Defender P425 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 RECENTMERCEDES 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 P425

Land Rover Defender P425

RECOVERY

Land Rover Defender P425

Land Rover Defender P425

DIAGNOSTICS

Land Rover Defender P425

Land Rover Defender P425

STRIPPED ENGINE

Land Rover Defender P425

Land Rover Defender P425

TIMING CHAIN REPLACEMENT

Land Rover Defender P425

Land Rover Defender P425

IN FOR REBUILD

Land Rover Defender P425

Land Rover Defender P425

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.

Land Rover engines on workshop pallets

LOOKING FOR A USED ORREPLACEMENT ENGINEINSTEAD?

We supply low-mileage, VIN-matched used units too, and offer full replacement and fitting. However, most Defender P425 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 — we'll show you every option, honestly.

Ask About Used Engine Options

ABOUT THE Land Rover Defender P425 ENGINE

Land Rover AMG GT 53 engine and sedan

The Defender P425 is a 2024 variant of the L663-generation Defender, fitted with the AJ133 — a 5.0-litre supercharged V8 that sits alongside the P500 and P525 as part of the same engine family, with the badge tracking the power tune rather than indicating a different engine. The AJ133 is a well-established Jaguar Land Rover V8 platform, shared with models like the Range Rover Sport SVR and Velar SVAutobiography Dynamic Edition, and is known as a generally reliable unit in its class. The P425 was produced as a 2024 model-year offering across the 90, 110 and 130 body styles, making it the most accessible entry point into V8-powered L663 Defender ownership before higher-output tunes arrived.

We continue to rebuild and replace AJ133 engines for every Defender P425 on the road.

Land Rover Defender P425 ENGINE CODES

A 5.0-litre supercharged V8 fitted to the Defender P425 in 2024 (L663 generation). This is the same AJ133 platform used across the P500 and P525 badges, with the number indicating the power output tune rather than a distinct engine design. No Defender-specific issue is confirmed for this application; reliability patterns are inferred from the broader supercharged AJ-V8 family used in sibling models such as the Range Rover Sport SVR and Velar SVAutobiography Dynamic Edition. We replace timing chains, bearings, water pump and gaskets as standard on every AJ133 rebuild. Check Your AJ133 Defender P425 → [link to quote form]

Check Your AJ133 Defender P425

Land Rover Defender P425 ENGINE COMPATIBILITY

Land Rover touring in workshop

Because the Defender P425 is a single-year variant that shares its engine platform with the P500 and P525, fitting the correct specification parts matters for maintaining the intended performance and reliability. Before we quote or supply anything, we confirm:

Your exact engine code (AJ133)

Your generation (L663)

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 Defender quote — it protects you from paying for parts that don't fit your actual car.

Land Rover Defender P425 APPLICATIONS BY GENERATION

Generation

Chassis

Years

Engine Code

Fuel

L663

L663

L663

2024

AJ133

Petrol Supercharged

Land Rover Defender P425 ENGINES BY YEAR

Land Rover Defender P425 has used the AJ133 throughout. If you're unsure of your exact spec, we'll confirm it before you book.

Year

Generation

Engine Code

Fuel

Service

2024

L663

AJ133

Petrol Supercharged

Rebuild / Replacement

i

The AJ133 has been fitted to every Defender P425 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 P425 MODEL YEAR:

Land Rover Defender P425
2024 Engine Rebuild

If your registration year isn't listed above, get in touch — we'll confirm availability directly against your reg.

Land Rover Defender P425 ENGINE COSTS

A Land Rover Defender P425 engine rebuild starts from

£4,500

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 AMG GT 53 engine

12 MONTH

UNLIMITED-MILEAGE

WARRANTY

MERCEDES Defender P425 ENGINE SIZES

Land Rover Defender P425 3.0 Litre Engine (AJ133, I6)

MERCEDES Defender P425 FUEL TYPES

Land Rover Defender P425 Petrol Mild Hybrid Engine Rebuilds

RELATED LAND ROVER ENGINES

View All Land Rover Engines

Most Land Rover Defender P425 engine rebuilds are completed within 3-5 working days.

Nationwide recovery and collection available for all Land Rover Defender P425 models.

Land Rover AMG GT recovery and collection

FREQUENTLY ASKED QUESTIONS

Land Rover AMG GT in a dark showroom

Land RoverGET YOUR FREE MERCEDES Defender P425 FIXED-PRICE QUOTE

Most quotes returned within 30 minutes during working hours.