

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

Your Land Rover Defender P425 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.
DVLA & VIN verified
100% secure & private
No obligation quote
Land Rover Defender P425Engine Rebuild Price
Starting From £4,500

Engine Code
AJ133Rebuild From
£4,500

Generation
Exact price depends on condition and parts required — submit your reg for a 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 Defender P425ENGINE OPTIONS
Every Defender P425 is different. That's why we offer the right solution for your engine, your car and your budget.
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.
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.
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.
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.
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.
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 OptionsOUR WORKSHOP
01RECOVERY COLLECTION
02AJ133 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 P425 rebuild looks like.
Land Rover Defender P425 ENGINE REBUILD PROCESS
WHAT MERCEDES Defender P425 OWNERS SAY
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.
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
RECOVERY

Land Rover Defender P425
DIAGNOSTICS

Land Rover Defender P425
STRIPPED ENGINE

Land Rover Defender P425
TIMING CHAIN REPLACEMENT

Land Rover Defender P425
IN FOR REBUILD

Land Rover Defender P425
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 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.
ABOUT THE Land Rover Defender P425 ENGINE

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 P425Land Rover Defender P425 ENGINE COMPATIBILITY

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
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.
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.

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
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.









