How much does a Land Rover Defender P500 engine replacement cost in the UK?

A reconditioned 5.0 V8 AJ133 engine typically costs £6,000–£10,000 supply only, with fitting adding £1,600–£2,200. Use our calculator for a figure specific to your Defender.

Is the Defender P500 (AJ133 V8) engine reliable?

Yes — the current iteration of the AJ133 is significantly more reliable than early versions. It is a robust, characterful V8 — but it's maintenance-sensitive. Timing chain tensioner wear and coolant crossover pipe failure are the two main watchpoints.

What are the common problems with the Defender P500 engine?

Timing chain tensioner wear (preventable with 5,000–7,500-mile oil changes), coolant crossover pipe failure, and supercharger coupler wear.

Is it worth replacing a Defender P500 engine, or should I scrap the car?

Depends on vehicle value. A well-specced P500 Defender is a £70,000–£100,000 vehicle — an £8,000 recon is only 8–11% of the car's value, making replacement a clear decision. This is well within our 60% Land Rover threshold.

How do I find my Defender P500 engine code?

Listed on the VIN plate and vehicle documentation. The P500 engine code is 508PS (AJ133) — a 5.0-litre supercharged V8. Tell us your registration date and we'll confirm it for free.

Can I repair the timing chain on a P500, or does it need replacement?

Yes — if caught early. A preventative timing chain and tensioner replacement (£2,000–£4,000) is far cheaper than a catastrophic chain snap (engine replacement at £6,000–£12,000). At the first sign of cold-start rattle, book an inspection immediately.

Land Rover Defender P5002023–present508PS AJ133 V8

Land Rover Defender P500 Engine Replacement — Compare Prices & Get Quotes

The 5.0-litre supercharged V8 brings 500 PS of Jaguar-Land Rover AJ133 power to the Defender range — a flagship petrol option for the L663 generation. Get quotes from trusted UK specialists today.

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Defender P500 Engines — from £4,000 to £12,000508PS AJ133 V8

Defender P500 Engines — from £4,000 to £12,000· 508PS AJ133 V8

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

The DEFENDER P500 THROUGH TIME — Era Map

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

GenerationYearsEngine CodeReliabilityRecon CostEra Note

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 P500 Engine Replacement Costs

Supply Only£6,000–£10,000

Fitted (Indie)£7,600–£11,800

Warranty12–24 months

Best ForMost owners — best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£4,000–£6,500£5,400–£8,0001–6 monthsBudget priority; lower-mileage donor

Reconditioned Engine£6,000–£10,000£7,600–£11,80012–24 monthsMost owners — best cost/warranty balance

Rebuilt Engine£8,000–£12,000£9,600–£13,80012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer New£12,000–£18,000£13,800–£20,00024–36 monthsInsurance jobs, warranty claims

Figures above reflect the current AJ133 supercharged V8 generation.

Labour estimate: Fitting a Defender P500 V8 engine typically takes 16–22 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer).

→ Compare Defender P500 engine prices from UK specialists

Common Problems

1. Timing Chain Tensioner Wear

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

Typical mileage: 60,000–100,000 miles

Repair cost: £2,000–£4,000 (chain and tensioner replacement) [PLACEHOLDER — confirm vs cost sheet]

Replacement cost: N/A — repair only (if caught before catastrophic failure)

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

Our recommendation:

The AJ133's timing chain tensioner wear is the single most documented issue on this engine. The good news: it's preventable. Shorten oil change intervals to 5,000–7,500 miles and use the correct 5W20 oil (STJLR.03.5004 spec). At the first sign of cold-start rattle, have the tensioners inspected immediately — catching it early saves you a £4,000+ repair bill.

1. Timing Chain Tensioner Wear

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

Typical mileage: 60,000–100,000 miles

Repair cost: £2,000–£4,000 (chain and tensioner replacement) [PLACEHOLDER — confirm vs cost sheet]

Replacement cost: N/A — repair only (if caught before catastrophic failure)

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

Our recommendation:

2. Coolant Crossover Pipe Failure

Symptoms: Coolant loss with no visible external leak, low coolant warning light, occasional burning smell, overheating.

Typical mileage: 40,000–80,000 miles

Repair cost: £800–£1,500 (pipe replacement) [PLACEHOLDER — confirm vs cost sheet]

Replacement cost: N/A — repair only

🟠 Check - book inspection urgently if coolant levels drop

Our recommendation:

The plastic coolant crossover pipes on the AJ133 are a known weak point — they deteriorate every 4–5 years. If you notice coolant loss or a sweet smell from the engine bay, have the crossover pipes inspected. Replacing them preventatively is far cheaper than the overheating damage they can cause if they fail completely.

3. Supercharger Coupler Wear

Symptoms: Rattling or knocking noise from the supercharger, particularly at idle, loss of supercharger efficiency.

Typical mileage: 70,000–120,000 miles

Repair cost: £500–£1,200 (coupler replacement) [PLACEHOLDER — confirm vs cost sheet]

Replacement cost: £1,500–£3,000 (complete supercharger) [PLACEHOLDER — confirm vs cost sheet]

🟡 Monitor - book inspection soon

Our recommendation:

The supercharger coupler is a wear item on the AJ133 — it's the component that connects the supercharger drive to the rotors. If you hear a rattling or marbles-in-a-tin-can noise from the supercharger area, have the coupler inspected. Replacement is straightforward and far cheaper than a complete supercharger rebuild.

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Defender P500 — 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 P500 — 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 (if caught early)£2,000–£4,000Preventative — catch it before chain skipsCoolant crossover pipe failure✅ Yes£800–£1,500Straightforward fix — do preventatively every 4–5 yearsSupercharger coupler wear✅ Yes£500–£1,200Routine maintenance — replace when noisyTiming chain snapped❌ Usually NoEngine replacementPiston-valve contact means little is left to repairSupercharger failure (internal)⚠️ Sometimes£1,500–£5,000Viable on lower-mileage examples; assess overall engine condition

Buying This Defender P500? Check These First

Buy If

Documented oil change history with 5,000–7,500-mile intervals (not 15,000-mile factory schedule)
Coolant crossover pipes replaced preventatively
No cold-start rattle or supercharger noise
Full JLR service history with correct 5W20 oil (STJLR.03.5004 spec)

Avoid If

Cold-start rattle with no timing chain history — walk away
No record of coolant system maintenance
Supercharger noise at idle — coupler or bearings may be failing
Engine warning light with no diagnosis — AJ133 electrical gremlins can be costly

Closing Verdict

The AJ133 5.0 V8 is a genuinely characterful engine that transforms the Defender into a proper performance SUV. It's not fragile — but it is maintenance-sensitive. The timing chain and coolant crossover pipes are the two watchpoints; buy on documented history with evidence of shortened oil change intervals, and you'll have a robust, rewarding flagship powertrain.

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

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Buying Checklist

Before you buy a used Land Rover Defender P500 (or before you commit to an engine replacement), check these:

Cold Start — Listen for rattling or ticking; timing chain tensioner wear is the main concern on this engine

Service History — including engine era (AJ133 V8) and confirmed 5,000–7,500-mile oil change intervals

Coolant Level — Check for low coolant; crossover pipe failure is common

Supercharger Noise — Listen for rattling or knocking at idle — coupler wear indicator

Oil Consumption — AJ133 V8s can consume oil; monitor levels between services

Engine Warning Light — Have codes been read? Any unresolved issues?

MOT History — Check for emissions-related failures

Fuel Economy — Expect 19–20 mpg combined; heavy consumption may indicate issues

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.

508PS (AJ133) 5.0 Supercharged V8

Years2023–present

Power500 PS (493 bhp) @ 6,000–6,500 rpm; 610 Nm @ 2,500–5,000 rpm

2025 Enquiries— (pattern data)

Avg. Recon Cost£6,000–£10,000 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

508PS (AJ133) 5.0 Supercharged V82023–present500 PS (493 bhp) @ 6,000–6,500 rpm; 610 Nm @ 2,500–5,000 rpm— (pattern data)£6,000–£10,000 [PLACEHOLDER]

Technical Specs

AJ133 5.0 Supercharged V8

Displacement5,000 cc

Cylinders8-cylinder V-configuration

Compression Ratio9.5:1

Fuel SystemDirect injection

TurbochargerSupercharged (Eaton-style twin-vortex supercharger)

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Market Intelligence

Most Common Failure

Timing chain tensioner wear — the single most documented AJ133 issue

[PATTERN DATA]

Average Enquiry Mileage

65,000

miles

[PATTERN DATA]

Average Replacement Cost

£8,000

reconditioned, supply only

[PLACEHOLDER — confirm vs cost sheet]

Most Requested Engine Code

508

PS (AJ133)

[PATTERN DATA]

Peak Enquiry Season

Winter — cold starts expose timing chain issues

[PATTERN DATA]

Regional Demand

South East20%

London18%

South West14%

PATTERN DATA

Regional Demand Breakdown

20%South East

18%London

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.

Find the best Land Rover Defender P500 engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and get back on the road with confidence — from £4,000 for a used unit to £12,000 for a fully rebuilt V8.

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100% Free

No hidden fees

No Obligation

Get quotes with zero pressure

UK Specialists

20+ vetted experts

12-Month Warranty

As standard

Nationwide Delivery

Supply & fit available