Land Rover Defender 90 P425 Engine ReplacementCompare Prices & Get Quotes
Get quotes today from trusted UK Land Rover Defender 90 P425 engine specialists. Compare prices on reconditioned, rebuilt and used engines to find the perfect match for your high-performance V8 Defender.
Supply & Fit Available
12-Month Warranty
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100+ Suppliers
From £8,000 to £12,000 [EM-QUOTE]
Used from £3,000 · Reconditioned from £5,500 · Common codes: AJ133
From £3,000
Tested, bare/short engine
From £5,500
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
Secure enquiry - no spam, no pressure. Genuine quotes only from vetted UK Land Rover Defender 90 P425 specialists.
3 Simple Steps3 Simple Stepsto Finding the Best Land Rover Defender 90 P425 Replacement Engineto Finding the Best Land Rover Defender 90 P425 Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryLand Rover Defender 90 P425 - Engine History & Specs at a Glance
When the P425 variant was introduced to the Defender 90 lineup, it brought a detuned, highly refined version of Land Rover’s legendary 5.0-litre supercharged V8, offering a sweet spot of exhilarating performance and daily drivability.
Variant HistoryLand Rover Defender 90 P425 - Engine History & Specs at a Glance
When the P425 variant was introduced to the Defender 90 lineup, it brought a detuned, highly refined version of Land Rover’s legendary 5.0-litre supercharged V8, offering a sweet spot of exhilarating performance and daily drivability.
Land Rover Defender 90 P425
Fuel TypePetrol (Premium ULP)
Engine Size Range5.0L (4999cc)
Power Output Range425 PS (419 bhp / 313 kW) across the variant's historyEngine History Timeline
AJ133 5.0L Supercharged V8 425 PS (419 bhp), 550 Nm (Introduction of the P425 V8 variant to the L663 Defender 90 range, featuring a revised ECU map for enhanced refinement)
Key Specs Snapshot
Fuel TypePetrol (Premium ULP)Engine Size Range5.0L (4999cc)Power Output Range425 PS (419 bhp / 313 kW) across the variant's historyYears Produced2024-presentEvery engine fitted to the Land Rover Defender 90 P425 is covered below, with UK rebuilt pricing and known failure points.
Land Rover Defender 90 P425 Engine Codes - Specifications & Replacement CostLand Rover Defender 90 P425 Engine Codes - Specifications & Replacement Cost
5.0L Supercharged Petrol (2024-present)
Power Output425 PS (419 bhp / 313 kW)Years Fitted2024-present
Compatible Trim Levels
- Defender 90 P425 X-Dynamic SE
- Defender 90 P425 X-Dynamic HSE
- Defender 90 P425 Edition
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£3,000-£5,500
Reconditioned
Addressed known issues, tested
£5,500-£9,000
Rebuilt
Full teardown, upgraded internals
£8,000-£12,000
Common Failure
While generally robust in its newer L663 application, the AJ133 platform is known for potential supercharger coupler wear and coolant leaks from crossover pipes at higher mileages.
The Land Rover Defender 90 P425 is celebrated for its accessible V8 performance and refined power delivery. The AJ133 5.0L Supercharged V8 is the sole engine code dominating replacement demand for this variant. Rebuilt engines supplied through EnginesMarket include upgraded components, such as revised supercharger couplers and cooling system seals, addressing the original failure points, plus a minimum 12-month unlimited-mileage warranty.
Why the Land Rover Defender 90 P425 AJ133 Requires Attention
Affected Vehicles
Land Rover Defender 90 P425 (AJ133, 2024-present)
Typical Failure Mileage
60,000-100,000+ miles
Root Cause
The supercharger coupler can degrade over time, causing a rattling noise on deceleration, while plastic coolant crossover pipes are prone to becoming brittle and leaking under thermal stress.
Why It Happens
The supercharger coupler can degrade over time, causing a rattling noise on deceleration, while plastic coolant crossover pipes are prone to becoming brittle and leaking under thermal stress.
Dealer (parts + labour)
£800-£1,500
Specialist (parts + labour)
£500-£900
What it involves
Replace supercharger coupler, inspect and replace coolant crossover pipes and seals.
Suitability
Highly recommended as preventative maintenance to avoid catastrophic overheating or supercharger failure.
1 - 2 daysDealer (parts + labour)
£10,000-£14,000
Specialist (parts + labour)
£8,000-£12,000
What it involves
Supply & fit, upgraded components addressing the original failure point, 12-month warranty.
Suitability
The right call if there is bottom-end wear, severe overheating damage, or you want long-term reliability for a high-value keeper vehicle.
1 - 2 days
All prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 Preventative Cooling/Supercharger Service Minor | £800-£1,500 | £500-£900 | Replace supercharger coupler, inspect and replace coolant crossover pipes and seals. | Highly recommended as preventative maintenance to avoid catastrophic overheating or supercharger failure. | 1 - 2 days |
 Full Replacement - rebuilt/reconditioned engine Best Value | £10,000-£14,000 | £8,000-£12,000 | Supply & fit, upgraded components addressing the original failure point, 12-month warranty. | The right call if there is bottom-end wear, severe overheating damage, or you want long-term reliability for a high-value keeper vehicle. | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical Land Rover Defender 90 P425 in running condition is valued between £80,000 and £110,000+ depending on specification and mileage [THIRD-PARTY]. - Vehicle worth under ~£5,000: repair or used engine typically makes more sense than a full rebuilt unit. - Vehicle worth ~£5,000-£8,000: evaluate both; reconditioned is viable if keeping the car 2+ years. - Vehicle worth ~£8,000-£15,000: reconditioned/rebuilt usually justifies the premium via warranty and reliability. - Vehicle worth £15,000+: replacement cost is typically small relative to vehicle value. Note: For a high-value asset like the Defender 90 P425, investing in a fully rebuilt AJ133 engine with upgraded components is highly recommended to protect the vehicle's substantial market value.
Our Recommendation
Our Recommendation
If your Defender 90 P425 is exhibiting early signs of supercharger rattle or minor coolant seepage, a preventative specialist service is a cost-effective solution. However, if the engine has suffered severe overheating or internal damage, a full reconditioned replacement is the most reliable long-term investment to preserve the vehicle's performance and value.
Don't Let Engine Failure Write Off Your Land Rover Defender 90 P425
Preserving a high-performance modern Defender requires the right parts and expertise. By comparing quotes through EnginesMarket, you avoid main dealer premiums while securing a rebuilt or reconditioned AJ133 engine fitted with upgraded components and backed by a minimum 12-month unlimited-mileage warranty. Our nationwide network ensures your iconic V8 4x4 is handled by specialists who understand modern Land Rover engineering.
Compare rebuilt AJ133 Land Rover Defender 90 P425 engine prices
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
"All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific Land Rover Defender 90 P425. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
Land Rover Defender 90 P425 Engine ReplacementFrequently Asked Questions
Question 1How much does a Land Rover Defender 90 P425 engine replacement cost-
A full reconditioned or rebuilt Land Rover Defender 90 P425 engine typically costs between £5,500 and £12,000 for the unit itself, depending on the level of rebuild.
- Used units can be found from £3,000, but carry higher risk for a high-performance V8.
- Supply and fit labour will add approximately £910-£1,170 depending on the specialist.
Question 2What are the signs of supercharger or cooling failure in a Land Rover Defender 90 P425-
Early detection is critical to preventing catastrophic damage to your AJ133 V8 engine.
- Listen for a distinct rattling or whining noise from the supercharger on deceleration.
- Look for unexplained coolant loss, sweet smells from the engine bay, or overheating warnings on the dashboard.
Question 3Is it worth replacing the engine in a Land Rover Defender 90 P425-
Yes, absolutely, given the high retained values of the L663 V8 Defender range.
- A rebuilt AJ133 engine with upgraded supercharger couplers and cooling components can extend the vehicle's life significantly.
- For vehicles valued over £80,000, a warranted reconditioned engine protects your investment far better than a cheap used unit.
Question 4What is the difference between the P425 and P525 Defender 90 engines-
Both variants use the same legendary 5.0-litre supercharged V8 hardware.
- The P425 is intentionally detuned via a revised ECU map to produce 425 PS, offering a smoother, more refined daily driving experience.
- The P525 produces 525 PS, prioritising maximum peak performance.
Question 5How long does a Land Rover Defender 90 P425 engine replacement take-
A straightforward supply and fit of a reconditioned AJ133 engine typically takes 3 to 5 days at a specialist workshop.
- This allows time for proper bedding-in procedures, ECU calibration, fluid checks, and a thorough road test to ensure the V8 powertrain is balanced and performing correctly.
Why Choose UsCompare Land Rover Defender 90 P425Engine PricesToday
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12-Month Warranty on every rebuilt Land Rover Defender 90 P425 engine
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Don't leave your high-performance Defender's reliability to chance. Comparing quotes through EnginesMarket is 100% free and no-obligation, connecting you directly with vetted UK specialists who understand the unique engineering of the Land Rover Defender 90 P425. Get the right engine, at the right price, with the warranty you deserve.
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