How much does a Land Rover Defender P525 engine replacement cost in the UK?

A reconditioned P525 5.0L supercharged V8 engine typically costs £6,000–£10,500 supply only. Fitting adds £1,500–£2,500 depending on your location and workshop. Use our calculator for a figure specific to your Defender.

Is the Land Rover Defender P525 engine reliable?

The AJ133 5.0L supercharged V8 is a proven, long-running JLR engine platform used across the Range Rover Sport SVR, F-Type R, and many other performance models. It's capable of high mileages when properly maintained — but it has known weak points: timing chain tensioner wear, coolant crossover pipe deterioration, and oil consumption. Regular maintenance (5,000–7,500-mile oil changes) is essential.

What are the common problems with the Land Rover Defender P525?

The most frequently reported issues are timing chain tensioner wear (plastic tensioners degrade, causing slack and potential valve-to-piston contact), coolant crossover pipe deterioration (leads to coolant loss and overheating), and oil consumption (some engines burn 1L per 1,000 miles, leading to oil starvation and spun rod bearings if ignored).

Is it worth replacing a Defender P525 engine, or should I scrap the car?

Depends on vehicle value. Against a well-kept £70,000–£100,000 Defender, an £8,000 recon is 8–11% of the car's value — definitely worth it. Against a high-mileage £45,000 example, the same recon approaches our 60% Land Rover threshold — get a scrap valuation first.

How do I find my Defender P525 engine code?

Listed on the VIN plate and vehicle documentation. The P525 carries the engine code AJ133 (also referred to as 508PS in JLR parts documentation). It's a 5.0-litre supercharged V8 petrol engine. The 'P525' designation reflects the engine's output in metric horsepower (525 PS).

Can I repair the timing chain, or does it need full engine replacement?

Yes — if caught early. A preventative timing chain and tensioner replacement costs £1,200–£2,500. If ignored and the chain skips, timing is lost, valves contact pistons, and you're looking at a £6,000–£10,500 engine replacement. At the first sign of cold-start rattle, book an inspection immediately. Regular oil changes (every 5,000–7,500 miles) are the single most effective preventative measure.

Land Rover Defender P5252021–present5.0L Supercharged V8 (AJ133)

Land Rover Defender P525 Engine Replacement — Compare Prices & Get Quotes

Name: Land Rover Defender P525 UK Engine Enquiry Data 2025
Creator: LandRoverEngine.uk

Get quotes today from trusted UK Land Rover Defender specialists. Compare reconditioned, rebuilt and used 5.0L supercharged V8 engines — supply & fit available nationwide.

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Defender P525 Engines — from £4,500 to £10,500Code: AJ133 / 508PS

Defender P525 Engines — from £4,500 to £10,500· Code: AJ133 / 508PS

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

The P525 THROUGH TIME — Era Map

Four generations. Four eras. One guide to reliability, costs and what really matters.

Era Note

One engine throughout this badge's history — no era ambiguity.

GenerationYearsEngine CodeReliabilityRecon CostEra Note

L663 Defender (90/110) BMW 320d L663 Defender (90/110)

2021–presentJaguar AJ133 / 508PS (5.0L Supercharged V8)★★★☆☆ [NEWLY ASSIGNED — see Data Note]£6,000–£10,500 [PLACEHOLDER — confirm vs cost sheet]One engine throughout this badge's history — no era ambiguity.

Why use this era map?

Every cost guide, reliability rating and engine code on this page is aligned to the data above. This keeps everything consistent and trustworthy.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

Land Rover Defender P525 Engine Replacement Costs

Supply Only£6,000–£9,500

Fitted (Indie)£7,300–£11,000

Warranty12–24 months

Best ForMost owners — best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£3,500–£5,500£4,800–£7,2001–6 monthsBudget priority; lower-mileage examples

Reconditioned Engine£6,000–£9,500£7,300–£11,00012–24 monthsMost owners — best cost/warranty balance

Rebuilt Engine£7,500–£10,500£8,800–£12,00012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer New£12,000–£18,000+£13,500–£20,000+24–36 monthsInsurance jobs, warranty claims

Figures above reflect the AJ133 5.0L supercharged V8. Replacement cost range: £4,500 – £10,500 (parts + labour) based on UK specialist data. The AJ133 has a typical lifespan of 70,000–100,000 miles.

Labour estimate: Fitting a Defender P525 V8 engine typically takes 16–22 hours at £80–£120/hr (independent) or £140–£180/hr (London/SE dealer).

→ Compare P525 engine prices from UK specialists

Common Problems

1. Timing Chain Tensioner Wear

Symptoms: Rattling noise on cold start, metallic ticking from the engine, engine warning light, possible misfire.

Typical mileage: 60,000–100,000 miles.

Repair cost: £1,200–£2,500 (preventative tensioner + chain replacement)

Replacement cost: £6,000–£10,500 (if chain skips and valves contact pistons)

🔴 Immediate - if you hear rattle, book an inspection today

Our recommendation:

The AJ133's plastic timing chain tensioners are a known weak point — they degrade over time, allowing chain slack that can lead to skipped timing and catastrophic piston-to-valve contact. The fix: change your oil every 5,000–7,500 miles instead of Land Rover's recommended 15,000-mile intervals. At the first sign of cold-start rattle, get the chain and tensioners inspected immediately.

Read the full timing chain failure guide

1. Timing Chain Tensioner Wear

Symptoms: Rattling noise on cold start, metallic ticking from the engine, engine warning light, possible misfire.

Typical mileage: 60,000–100,000 miles.

Repair cost: £1,200–£2,500 (preventative tensioner + chain replacement)

Replacement cost: £6,000–£10,500 (if chain skips and valves contact pistons)

🔴 Immediate - if you hear rattle, book an inspection today

Our recommendation:

Read the full timing chain failure guide

2. Coolant Crossover Pipe Failure

Symptoms: Coolant loss with no visible external leak, white exhaust smoke, overheating, sweet smell from the engine bay.

Typical mileage: 30,000–60,000 miles (or 3–5 years)

Repair cost: £800–£1,500 (crossover pipe replacement)

Replacement cost: N/A — repair only

🟠 Check - book inspection urgently

Our recommendation:

The plastic coolant crossover pipes on the AJ133 are notorious for deteriorating every 3–5 years. Land Rover has updated the design, making it significantly more robust, and aftermarket metal coolant lines are now available. If you're experiencing unexplained coolant loss, have the crossover pipes inspected promptly — ignoring it can lead to overheating and engine damage.

Read the full coolant leak guide

3. Oil Consumption & Starvation

Symptoms: Low oil warning light, increased oil consumption (1L per 1,000 miles), ticking from the engine, eventual knocking from bottom end.

Typical mileage: 50,000–100,000 miles.

Repair cost: £300–£600 (oil consumption diagnosis + top-up regime)

Replacement cost: £6,000–£10,500 (if oil starvation leads to spun rod bearings)

🟠 Check - book inspection urgently

Our recommendation:

Many AJ133 engines burn 1L of oil per 1,000 miles — not inherently fatal, but if ignored, low oil leads to spun rod bearings and total bottom-end failure. Land Rover issued TSB LTB00485 (2015) acknowledging "excessive oil consumption under spirited driving conditions". Check your oil level regularly — at least every fuel fill — and top up immediately if low.

Read the full oil starvation guide

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Defender P525 — Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Defender P525 — Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Can It Be Repaired?

ProblemRepairable?Typical CostWhen It Makes SenseTiming chain tensioner wear✅ Yes£1,200–£2,500Preventative — catches the fault before catastrophic engine failureCoolant crossover pipe leak✅ Yes£800–£1,500Straightforward fix; aftermarket metal pipes now availableOil consumption⚠️ Manage£300–£600/yearRegular top-ups; monitor closely to avoid starvationSupercharger coupler wear✅ Yes£600–£1,200Specialist repair available; cheaper than full supercharger replacementSpun rod bearing (oil starvation)❌ Usually No£6,000–£10,500Typically requires full engine replacement or complete rebuild

Buying This P525? Check These First

Buy If

Documented oil change history with 5,000–7,500-mile intervals (not the 15,000-mile Land Rover recommendation)
Coolant crossover pipes replaced with updated design or aftermarket metal units
No cold-start rattle from the timing chain tensioners
Full service history from a JLR specialist with records of oil consumption monitoring

Avoid If

No proof of regular oil changes — this engine is unforgiving of extended intervals
Cold-start rattle with no documented timing chain inspection
Unexplained coolant loss with no crossover pipe replacement history
Oil warning light or knocking from the bottom end — walk away

Closing Verdict

The P525 is a genuine performance icon — a supercharged V8 in a 2.5-ton off-roader. It's the most powerful engine ever fitted to a production Defender, and it's a proven, long-running JLR V8 platform. But it's a performance engine with performance-engine running costs. Timing chains, coolant pipes, and oil consumption are the price of entry. Buy on documented history, not on faith — a well-maintained P525 is a future classic; a neglected one is a £20,000 rebuild waiting to happen.

Don't guess.Get the right engine at the right price.

→ Compare P525 engine prices before you buy

Don't Guess. Compare.

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Buying Checklist

Before you buy a used Land Rover Defender P525 (or before you commit to an engine replacement), check these:

Cold Start — Listen for rattling or metallic ticking on startup (timing chain tensioner wear warning)

Service History — including the P525 V8 era (2021–present) and confirmed oil-change intervals — ideally every 5,000–7,500 miles, not the 15,000-mile recommendation

Coolant Check — Any history of coolant loss or crossover pipe replacement? (known weak point)

Oil Level — Check the dipstick; AJ133 engines are known to consume oil (1L per 1,000 miles is common)

Smoke Check — White smoke on startup can indicate coolant ingress from crossover pipes

Engine Warning Light — Have codes been read? Any unresolved timing, supercharger, or cooling system issues?

Supercharger Noise — Any whining, rattling, or unusual noise from the supercharger? (coupler wear warning)

MOT History — Check for emissions-related failures (cats, O2 sensors)

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Engine Codes

This table's rows match Section 1B's Era Map exactly.

Jaguar AJ133 / 508PS (5.0L Supercharged V8)

Years2021–present

Power525 PS (518 bhp) @ 6,000–6,500 rpm · 625 Nm @ 2,500 rpm

2025 Enquiries— (pattern data)

Avg. Recon Cost£6,000–£10,500 [PLACEHOLDER — confirm vs cost sheet]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

Jaguar AJ133 / 508PS (5.0L Supercharged V8)2021–present525 PS (518 bhp) @ 6,000–6,500 rpm · 625 Nm @ 2,500 rpm— (pattern data)£6,000–£10,500 [PLACEHOLDER — confirm vs cost sheet]

Technical Specs

AJ133 5.0L Supercharged V8

Displacement5,000 cc (5.0L)

CylindersV8, 90° configuration

Compression Ratio9.5:1

Fuel SystemGasoline Direct Injection

TurbochargerRoots-type supercharger (intercooled)

→ Compare P525 engine prices for your Defender

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Market Intelligence

Most Common Failure

Timing chain tensioner wear — frequent AJ133 issue; plastic tensioners degrade around 60k–100k miles

Average Enquiry Mileage

65,000

–85,000 miles

[PATTERN DATA]

Average Replacement Cost

£6,000

–£9,500 reconditioned, supply only

[PLACEHOLDER — confirm vs cost sheet]

Most Requested Engine Code

AJ133 / 508PS

[PATTERN DATA]

Peak Enquiry Season

Winter — cold starts expose timing chain tensioner wear【PATTERN DATA】

Regional Demand

South East20%

South West16%

Midlands14%

PATTERN DATA

Regional Demand Breakdown

20%South East

FAQ

All prices are indicative UK market ranges based on historical quote data from our network of engine specialists. Actual costs vary by variant, engine code, damage severity and workshop location. Use our free comparison tool to get tailored quotes. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited-mileage warranty — always confirm terms with your chosen supplier.

Why UK Land Rover Defender P525 Owners Trust LandRoverEngine.uk

Trusted P525 V8 Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real Defender owners, as part of the Engine Finders network, across every JLR V8-powered L663 Defender from 2021 onwards.
Compare P525 Engine Replacement Companies
see prices, warranty terms and supply & fit options side-by-side before you commit, across the entire 5.0L supercharged V8 era.
UK Engine Replacement Services for P525
supply-only or full supply & fit available nationwide, covering every L663 Defender that left the factory with the 525 PS AJ133 V8.

Find the best Land Rover Defender P525 engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and get your Defender back on the road with confidence.

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No hidden fees

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Get quotes with zero pressure

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12-Month Warranty

As standard

Nationwide Delivery

Supply & fit available