Is the Land Rover Range Rover Sport P400 engine reliable?

Yes — the AJ20P6 is considered significantly more reliable than its diesel counterparts. It has fewer chronic issues; the main concerns are cooling system components (water pump) and occasional timing chain tensioner wear. With good maintenance, these engines are dependable and capable of high mileage.

What are the common problems with the Land Rover Range Rover Sport P400?

Cooling system component failures (water pump, coolant pipes), timing chain tensioner wear (less common than on diesel Ingenium), and 48V mild-hybrid battery degradation. All are well-understood by JLR specialists and generally less severe than diesel Ingenium issues.

Is it worth replacing a Range Rover Sport P400 engine, or should I scrap the car?

Range Rover Sport values remain strong — a well-kept L494 or L461 is often worth £25,000–£55,000+. A £4,500–£7,500 reconditioned engine is only 10–20% of the vehicle's value — well within the Land Rover 60% scrap threshold. Replacement is almost always worthwhile.

How do I find my Land Rover Range Rover Sport P400 engine code?

The engine code is AJ20P6 — it's the only 3.0-litre petrol inline-six used in the Range Rover Sport P400. You can find it on the VIN plate, in the vehicle documentation, or on a label on the engine itself. Production years: L494 (2019–2022) and L461 (2022–present).

Can I repair the AJ20P6 timing chain, or does it need replacement?

Yes — if caught early, the tensioner and chain can be replaced preventatively (£1,500–£2,500). If the chain jumps and causes valve interference, a full engine replacement (£4,500+) is usually required. Act on any cold-start rattle.

Land Rover Range Rover Sport P4002019–present3.0-litre Ingenium Petrol MHEV

Land Rover Range Rover Sport P400 Engine Replacement — Compare Prices & Get Quotes

Name: Land Rover Range Rover Sport P400 UK Engine Enquiry Data 2025
Creator: LandRoverEngine.uk

The Range Rover Sport P400 packs a 3.0-litre turbocharged Ingenium petrol with mild-hybrid assistance — more refined than the diesels and with fewer chronic issues. Get quotes from UK specialists for reconditioned, rebuilt and used units today.

Supply & Fit Available

12-Month Warranty

Nationwide Delivery

12 Specialists

Supply & Fit Available

12-Month Warranty

Nationwide Delivery

12 Specialists

Range Rover Sport P400 Engines — from £2,500 to £10,000Code: <a href='https://landroverengine.uk/engine/aj20p6'>AJ20P6</a>

Range Rover Sport P400 Engines — from £2,500 to £10,000· Code: <a href='https://landroverengine.uk/engine/aj20p6'>AJ20P6</a>

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

The P400 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 Range Rover Sport P400 Engine Replacement Costs

Supply Only£4,500–£7,500

Fitted (Indie)£6,500–£9,500

Warranty12–24 months

Best ForMost owners — best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£2,500–£4,500£4,200–£6,5001–6 monthsBudget priority; lower‑mileage examples

Reconditioned Engine£4,500–£7,500£6,500–£9,50012–24 monthsMost owners — best cost/warranty balance

Rebuilt Engine£6,500–£10,000£8,500–£12,00012–24 monthsLong‑term ownership; 3+ year horizon

Main Dealer New£9,000–£12,500£11,000–£15,00024–36 monthsInsurance jobs, warranty claims

Figures above reflect the current Range Rover Sport P400 market. This badge spans two generations — see the Era Map above for generation‑specific pricing. The L461 typically commands a premium for lower‑mileage examples.

Labour estimate: Fitting a Range Rover Sport P400 engine typically takes 12–16 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer).

→ Compare P400 engine prices from UK specialists

Common Problems

1. Cooling System Component Failures

Symptoms: Gradual coolant loss, dampness around the front of the engine, rising temperature gauge, occasional warning light, steam from bonnet

Typical mileage: 50,000–100,000 miles

Repair cost: £400–£1,000 (water pump, thermostat, or coolant pipe replacement)

Replacement cost: N/A — repair only

🟠 Check - book inspection urgently

Our recommendation:

The AJ20P6's cooling system is its most common weak point. The water pump, thermostat housing, and coolant pipes are known to develop leaks, especially on higher‑mileage examples. Catching it early avoids overheating damage. Replace the water pump as a preventative measure at around 60,000–70,000 miles — it's a well‑understood job for any JLR specialist.

Read the full coolant leak guide

1. Cooling System Component Failures

Symptoms: Gradual coolant loss, dampness around the front of the engine, rising temperature gauge, occasional warning light, steam from bonnet

Typical mileage: 50,000–100,000 miles

Repair cost: £400–£1,000 (water pump, thermostat, or coolant pipe replacement)

Replacement cost: N/A — repair only

🟠 Check - book inspection urgently

Our recommendation:

Read the full coolant leak guide

2. Timing Chain Tensioner Wear

Symptoms: Rattling noise on cold start lasting 1–3 seconds, occasional engine warning light if stretch alters cam timing

Typical mileage: 70,000–120,000 miles

Repair cost: £1,500–£2,500 (chain and tensioner replacement)

Replacement cost: £4,500–£7,500 (if chain jumps and causes valve interference)

🟡 Monitor - book inspection soon

Our recommendation:

Unlike the diesel Ingenium, the AJ20P6's timing chain issues are less catastrophic and less frequent, but they do occur. The tensioner can wear over time. A cold‑start rattle that lasts more than a second or two should be investigated promptly. Preventative replacement at around 80,000–100,000 miles is cheaper than a full engine rebuild.

Read the full timing chain failure guide

3. 48V Mild-Hybrid Battery System Issues

Symptoms: Reduced fuel economy, sluggish start-stop, warning lights, occasionally the car won't start

Typical mileage: 40,000–80,000 miles (battery degradation varies widely)

Repair cost: £800–£2,000 (48V battery replacement)

Replacement cost: N/A — repair only

🟡 Monitor - book inspection soon

Our recommendation:

The 48V mild-hybrid system on the AJ20P6 adds complexity. The battery can degrade over time, especially in vehicles used for short journeys. Symptoms include reduced fuel economy, sluggish start-stop, and warning lights. Replacement is a dealer or specialist job. It's worth noting that this is not a full hybrid — the 48V system is relatively straightforward compared to plug-in hybrids.

Read the full hybrid battery failure guide

Ready to Compare?

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12 vetted Land Rover specialists, every Range Rover Sport engine era covered, with a 12‑month warranty as standard.

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Range Rover Sport P400 — 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.

Range Rover Sport P400 — 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 SenseWater pump/coolant leak✅ Yes£400–£1,000Straightforward replacement — catches before overheatingTiming chain tensioner wear (preventative)✅ Yes£1,500–£2,500Cost‑effective on a well‑maintained example; cheaper than a full engineSnapped timing chain❌ Usually NoEngine replacementValve/piston contact means rebuild or replace48V mild-hybrid battery failure✅ Yes£800–£2,000Viable on a cherished example; not a fundamental engine faultHead gasket failure (overheating)⚠️ Sometimes£2,000–£4,000Viable on low‑mileage or cherished examples

Buying This Range Rover Sport P400? Check These First

Buy If

Documented water pump replacement or coolant system service history
No rattles on cold start — a quiet start-up suggests healthy timing chain tension
Full service history with correct JLR‑spec oil (0W‑20 or 5W‑30)
Post‑2021 build (later production has improved cooling system components)

Avoid If

Evidence of repeated coolant top‑ups without a diagnosed leak
Cold‑start rattle that lasts more than a couple of seconds
Poor service history — these engines are sensitive to oil quality
Any engine warning light without a clear diagnosis

Closing Verdict

The AJ20P6 is a genuinely impressive engine — smooth, powerful, and without the major reliability pitfalls of the diesel Ingenium. Its primary weaknesses are cooling system components and, occasionally, timing chain tensioners. A well‑serviced P400 with a fresh water pump is a dependable long‑term proposition. The mild‑hybrid system adds complexity but is generally reliable. If you're buying, prioritise service history — these engines reward diligence and punish neglect.

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

→ Compare P400 engine prices before you buy

Don't Guess. Compare.

Get real quotes from vetted UK specialists and make the right call for your 320d.

→ Compare P400 engine prices before you buy

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Buying Checklist

Before you buy a used Land Rover Range Rover Sport P400 (or before you commit to an engine replacement), check these:

1. Cold Start — Listen for rattles lasting more than 1–2 seconds (timing chain tensioner warning)

2. Service History — including which generation (L494 or L461) and evidence of oil changes

3. Coolant Level — Any signs of leaks around the water pump or coolant pipes?

4. 48V Battery Health — Any start‑stop issues or warning lights?

5. Oil Consumption — Does it use more than 0.5L per 1,000 miles?

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

7. Turbo Performance — Test acceleration; any hesitation or whistling? (turbo issues are rare but possible)

8. MOT History — Check for emissions‑related failures (catalyst, 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 — one engine code across two generations, with revised ancillaries from 2022.

AJ20P6

Years2019–2022

Power400 bhp

2025 Enquiries[PATTERN DATA]

Avg. Recon Cost£4,500–£7,500 [EM-QUOTE]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

AJ20P62019–2022400 bhp[PATTERN DATA]£4,500–£7,500 [EM-QUOTE]

AJ20P62022–present400 bhp[PATTERN DATA]£4,500–£7,500 [EM-QUOTE]

Technical Specs

AJ20P6

Displacement2,996cc (3.0‑litre)

CylindersInline‑6

Compression Ratio10.5:1

Fuel SystemDirect injection (common‑rail)

TurbochargerSingle twin‑scroll turbocharger with electric wastegate

48V MHEVIntegrated starter‑generator (ISG) with 48V battery

→ Compare P400 engine prices for your Range Rover Sport

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Market Intelligence

Most Common Failure

Cooling system component failures (water pump, coolant pipes) — the most frequently reported issue on the AJ20P6

[PATTERN DATA]

Average Enquiry Mileage

50,000

–80,000 miles

[PATTERN DATA]

Average Replacement Cost

£4,500

–£7,500 reconditioned, supply only

[EM-QUOTE]

Most Requested Engine Code

AJ20P6 — the core 3.0‑litre Ingenium petrol

[PATTERN DATA]

Peak Enquiry Season

Spring — pre‑summer vehicle preparation

[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.

Trusted P400 Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real Range Rover Sport P400 owners, as part of the Engine Finders network, across both the L494 and L461 generations.
Compare P400 Engine Replacement Companies
see prices, warranty terms and supply & fit options side‑by‑side before you commit, with specialists who genuinely understand the AJ20P6's cooling system, timing chain, and mild‑hybrid nuances.
UK Engine Replacement Services for Range Rover Sport P400
supply‑only or full supply & fit available nationwide, covering every generation of this 3.0‑litre petrol with a 12‑month warranty as standard.

Find the best Land Rover Range Rover Sport P400 engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and keep your Range Rover Sport performing at its best.

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No hidden fees

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UK Specialists

20+ vetted experts

12-Month Warranty

As standard

Nationwide Delivery

Supply & fit available