11 Nov 2026

Quality Reconditioned Range Rover L405 Engines UK: Avoid the Wrong Rebuild

Reconditioned Range Rover L405 Engines UK from £5,400 Fitted. Know Which Faults a Rebuild Must Fix, Check Warranty and Compare Vetted Suppliers Today.

Quick answer: a reconditioned Land Rover Range Rover engine is only worth buying if the faults that kill these units have been properly addressed — not just cleaned and reassembled. For a Range Rover L405 engine replacement, expect to pay £5,400–£7,200 fitted for the 3.0L V6 diesels, £7,000–£9,000+ for the 4.4L SDV8 and £8,000–£12,000+ for the 5.0L V8 supercharged, with a written 12-month warranty as the benchmark.

Key Takeaways: what to check on each L405 Engine

• TDV6 (306DT): oil cooler seals, EGR, DPF — the simplest, most durable unit
• SDV6 (306DT twin-turbo): timing chain (pre-2014), turbo actuators, swirl flaps
• SDV8 (448DT): injectors, turbo plumbing
• 5.0L V8 (AJ133): coolant crossover pipes, chain guides, supercharger isolator
• Price guide (fitted, UK): £5,400–£7,200 (V6 diesels), £7,000–£9,000+ (SDV8), £8,000–£12,000+ (V8)

Buy reconditioned engines for sale with documentation and you buy reliability. Buy on price alone and you buy the same fault again.

Which Range Rover L405 models and engines does this guide cover?

This guide covers the L405 Range Rover (2012–2022) in TDV6, SDV6, SDV8 and 5.0 V8 Supercharged forms. Match the engine code (306DT, 448DT or AJ133) to your chassis before buying. Whether you need a reconditioned 3.0L diesel V6 engine, a 4.4L SDV8 engine or a 5.0 supercharged V8 engine replacement, the right rebuild starts with the right code.

Variant	Engine code	Key fault a rebuild must address
3.0L TDV6	306DT (single turbo)	Oil cooler seals, EGR/DPF condition
3.0L SDV6	306DT (twin turbo)	Timing chain (pre-2014), turbo actuators, swirl flaps
4.4L SDV8	448DT	Injectors, turbo plumbing
5.0L V8 Supercharged	AJ133	Coolant crossover pipes, timing chain guides, supercharger isolator

A rebuild that doesn’t name these faults isn’t a rebuild — it’s a clean-up.

What does a quality reconditioned L405 engine mean for each variant?

3.0L TDV6 (306DT single turbo) reconditioned engine

The most durable L405 diesel — 255–258 bhp with less thermal stress than the twin-turbo. A quality rebuild renews the oil cooler seals, checks the EGR and DPF, and reassembles to specification. Serviced every 10,000 miles, these units go the distance.

3.0L SDV6 (306DT twin turbo) reconditioned engine

296–306 bhp and more complexity. The critical items are the timing chain (stretch is known on pre-2014 units), the turbo actuators and the swirl flaps. A rebuild that skips the chain on an SDV6 leaves the biggest risk untouched.

4.4L SDV8 (448DT) reconditioned engine

339 bhp and rated to 3,500 kg. Mechanically strong, but injectors and the twin-turbo plumbing are the weak points. A quality build addresses both and uses new seals throughout.

5.0L V8 Supercharged (AJ133) reconditioned engine

503–557 bhp. The known issues are coolant crossover pipe leaks, timing chain guide wear and supercharger isolator rattle. Revised coolant pipework and fresh chain guides are the marks of a rebuild done properly.

What should a quality L405 engine rebuild include?

• Full strip and clean
• New pistons, rings, bearings, gaskets and seals
• Timing chain and guide assessment (SDV6, V8)
• Cooling system components renewed where needed — revised pipework on the V8
• Supercharger inspection (AJ133)
• Crack testing and post-assembly checks on clearances, oil pressure and compression
• Documentation of what was replaced

Quality shows in specific upgrades, not general claims. On the TDV6, ask about oil cooler seals and EGR/DPF condition. On the SDV6, the timing chain and tensioners are critical, along with the turbo actuators. On the SDV8, ask about injectors and turbo plumbing. On the 5.0L V8, ask about revised coolant crossover pipework, fresh timing chain guides and a supercharger isolator assessed for rattle. When a supplier can name these upgrades for your variant, they understand the engine. When they can’t, the rebuild is guesswork with a paint finish.

Reconditioned, used or new: which L405 engine route is best?

Route	Pros	Cons	Best for
Used	Cheapest	Unknown history	Modest budgets with evidence
Reconditioned	New wear parts, updated components, warranty	Higher cost	Most owners
New	Perfect, full warranty	Very expensive	Rare cases

For most owners, a documented reconditioned engine offers the best balance of cost, reliability and warranty cover.

How much does a reconditioned L405 engine cost in the UK?

The cost of a Range Rover engine replacement depends on the variant. Fitted costs sit at £5,400–£7,200 for the V6 diesels, £7,000–£9,000+ for the SDV8, and £8,000–£12,000+ for the V8. The cheapest quote is rarely the cheapest outcome: the price should reflect the specific parts renewed on your engine code.

What testing and documentation should you demand?

• Compression results
• Oil pressure figures
• Leak-down data
• A build record naming renewed components
• Warranty terms in writing (12 months is the benchmark)

On an L405, the paperwork is the difference between a rebuild and a hope. Ask any supplier: what was replaced on this specific unit? Were the chain and guides assessed? Was the coolant pipework renewed? Are the ancillaries new or reused? What does the warranty cover, and who administers it? A specialist answers without hesitation and provides the paperwork. A middleman offers a price and little else.

Why do cheap L405 engines fail twice?

• Chain work skipped on an SDV6 or V8 — the same wear returns
• Old coolant pipework retained on the V8 — a known leak source
• Ancillaries reused — DPF, EGR, turbo and water pump can undo a good rebuild
• Oil intervals stretched — these engines punish delay more than most

Which parts should you replace while the L405 engine is out?

With the engine removed, these are worth renewing and aren’t always in the headline price: DPF, EGR valve, turbocharger, water pump, coolant hoses and pipework. On the V8 especially, revised coolant pipes should be part of the conversation.

Removing and refitting an L405 replacement engine is a substantial job, and these parts are far cheaper to renew now than to replace later with the engine back in the car. A quality supplier will talk you through this list and price it honestly rather than leaving it as a surprise.

How do you judge an L405 engine reconditioning supplier and warranty?

A 12-month warranty on a reconditioned L405 engine is the benchmark, but on the fault-prone variants it should cover the specific work done — the chain on an SDV6, the coolant pipes on a V8. Ask how a claim is handled and who decides it. Clear answers are a sign of a supplier who expects to stand behind the unit, not one hoping you won’t need to call.

How do you confirm the right engine code before buying?

Before choosing a supplier, be certain which engine you’re replacing. The 306DT, 448DT and AJ133 are different jobs with different costs, and a rebuild specification written for one is useless for another. Confirm the code from the vehicle, then insist the quote reflects it exactly.

Six-point checklist for judging any L405 rebuild

1. Engine code confirmed against the chassis
2. Variant-specific faults addressed and named — oil cooler on TDV6, chain and actuators on SDV6, coolant pipes and chain guides on the V8
3. New seals and bearings throughout
4. Ancillaries renewed or clearly listed
5. Test results supplied
6. A 12-month warranty, in writing

A supplier who satisfies all six is doing genuine engineering. One who satisfies two or three is selling a price. On a Range Rover, that distinction is worth thousands.

Conclusion: Buy the Rebuild, not the Price

On an L405, the difference between a well-executed rebuild and a cheap one isn’t visible on the invoice — it’s visible two years later, when one car is still running perfectly and the other is back in the workshop. Choose the engine variant that matches how you use the car, then buy the best rebuild you can afford for that variant. A documented TDV6 rebuild that addresses the oil cooler and EGR is worth more than a bargain SDV6 with unanswered questions. Given the cost of removing and refitting these engines, paying once for quality is almost always the cheaper route.

Frequently Asked Questions about Reconditioned Range Rover L405 Engines

What should a reconditioned L405 engine include?

New seals and bearings, chain and guide assessment where applicable, cooling components, testing and documentation.

How much is a reconditioned L405 engine?

£5,400–£7,200 fitted for the 3.0L diesels, £7,000–£9,000+ for the SDV8, and up to £12,000+ for the 5.0L V8.

Which L405 engine variant is most reliable?

The single-turbo 3.0L TDV6 (306DT), serviced every 10,000 miles.

Should I replace the ancillaries on an L405 engine?

Often yes — DPF, EGR, turbo and water pump are far cheaper to renew while the engine is out.

How long should the warranty be on a reconditioned L405 engine?

12 months in writing is the benchmark, and it should cover the specific work done on your variant.

Where can I buy a reconditioned L405 engine from trusted UK suppliers?

Through a comparison service working with vetted UK specialists, so you can compare rebuild quality and warranty side by side.

Get the right reconditioned L405 engine from vetted UK suppliers

Compare reconditioned and used engines for sale for the Range Rover L405 (TDV6, SDV6, SDV8 and 5.0 V8) from vetted UK suppliers — with rebuild scope, test evidence and warranty attached, and no obligation.

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