Is the Land Rover Range Rover Velar P340 engine reliable?

The AJ126 is a great engine, but its cooling system requires attention. Coolant warnings are extremely common and should never be ignored — they can lead to overheating, warped cylinder heads, or even full engine failure. The engine is also sensitive to oil sludge build-up, making frequent oil changes (every 8,000 miles) critical.

What are the common problems with the Land Rover Range Rover Velar P340?

Cooling system failures (expansion tank cracks, thermostat housing leaks, water pump leaks), supercharger coupler wear (rattling and 'clonk' on shutdown), and timing chain tensioner wear (rattle on cold start). The cooling system is the most common and urgent issue.

Is it worth replacing a Range Rover Velar P340 engine, or should I scrap the car?

Apply the 60% Land Rover scrap threshold: if your Velar is worth £20,000 and a recon engine is £7,000 (35%), it's worth it. If the vehicle is a tired £12,000 example, the same engine exceeds 50% — get a scrap valuation first. These are high-value vehicles that often justify replacement spend.

How do I find my Land Rover Range Rover Velar P340 engine code?

The engine code is listed on the VIN plate and vehicle documentation. The P340 uses the 306PS (also known as the AJ126) — a 3.0-litre supercharged V6 producing 340 PS. It was fitted to the Velar L560 from 2017 to 2020. Tell us your registration date and we'll confirm it for free.

Can I repair the cooling system, or does the engine need replacement?

Cooling system components can be repaired individually — expansion tank, thermostat housing, water pump. However, ignoring coolant warnings can lead to catastrophic engine failure, requiring a full replacement. Address any coolant leaks immediately.

Land Rover Range Rover Velar P3402017–20201 Engine Code

Land Rover Range Rover Velar P340 Engine Replacement — Compare Prices & Get Quotes

Name: Land Rover Range Rover Velar P340 UK Engine Enquiry Data 2025
Creator: LandRoverEngine.uk

The Velar's supercharged 3.0-litre V6 — a Jaguar-derived AJ126 producing 340PS. Get quotes from specialists who understand this complex and tightly-packaged engine, supply & fit available nationwide.

Supply & Fit Available

12-Month Warranty

Nationwide Delivery

12 Specialists

Supply & Fit Available

12-Month Warranty

Nationwide Delivery

12 Specialists

Range Rover Velar P340 Engines — from £3,000 to £11,000Common code: 306PS (AJ126)

Range Rover Velar P340 Engines — from £3,000 to £11,000· Common code: 306PS (AJ126)

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

The P340 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

Range Rover Velar L560 BMW 320d Range Rover Velar L560

2017–2020306PS (AJ126)★★★☆☆ [NEWLY ASSIGNED — see Data Note]£4,500–£11,000 [PLACEHOLDER — confirm vs cost sheet]One engine throughout this badge's history — no era ambiguity.

Why use this era map?

This table is the single source every other section on this page matches — Sections 2, 4 and 6 reference it rather than restating conflicting figures.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

Land Rover Range Rover Velar P340 Engine Replacement Costs

Supply Only£4,500–£11,000

Fitted (Indie)£5,500–£13,000

Warranty12–24 months

Best ForMost owners — best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£3,000–£5,000£4,000–£7,0001–6 monthsBudget priority; short-term ownership

Reconditioned Engine£4,500–£11,000£5,500–£13,00012–24 monthsMost owners — best cost/warranty balance

Rebuilt Engine£6,000–£13,000£7,000–£15,00012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer New£10,000–£15,000£12,000–£18,00024–36 monthsInsurance jobs, warranty claims

Figures above reflect the only engine generation this badge ever used — the 306PS (AJ126). See the Era Map above for era-specific pricing. For newer models like the Velar, replacement costs can range from £5,000 to £8,000.

Labour estimate: Fitting a Range Rover Velar P340 engine typically takes 15–25 hours at £65–£95/hr (independent). The tightly packed engine bay and complex supercharger system add significant labour time compared to simpler engines.

→ Compare Range Rover Velar P340 engine prices from UK specialists

Common Problems

1. Cooling System Failures (Expansion Tank, Thermostat Housing, Water Pump)

Symptoms: Intermittent "Coolant Level Low" warning, sweet coolant smell, small drips or crusted coolant on hoses, overheating during idling, steam from under the hood.

Typical mileage: Any mileage — often age-related as plastic components become brittle.

Repair cost: £200–£800 (expansion tank), £300–£800 (thermostat housing), £400–£1,200 (water pump).

Replacement cost: N/A — repair only; ignoring coolant warnings can lead to catastrophic engine failure.

🔴 Immediate - if the coolant warning comes on, pull over and let the engine cool. Never open the tank while hot.

Our recommendation:

The 3.0L V6 uses a tightly engineered cooling system with numerous plastic components. The most common cause of coolant warnings is a cracked expansion tank. The thermostat housing is another well-known failure point. If you see any coolant warnings, have the system inspected immediately. Even a one-time warning nearly always means a leak is developing, and this engine can overheat quickly if coolant drops even slightly.

1. Cooling System Failures (Expansion Tank, Thermostat Housing, Water Pump)

Symptoms: Intermittent "Coolant Level Low" warning, sweet coolant smell, small drips or crusted coolant on hoses, overheating during idling, steam from under the hood.

Typical mileage: Any mileage — often age-related as plastic components become brittle.

Repair cost: £200–£800 (expansion tank), £300–£800 (thermostat housing), £400–£1,200 (water pump).

Replacement cost: N/A — repair only; ignoring coolant warnings can lead to catastrophic engine failure.

🔴 Immediate - if the coolant warning comes on, pull over and let the engine cool. Never open the tank while hot.

Our recommendation:

2. Supercharger Coupler Wear

Symptoms: Diesel-like ticking and rattling from the engine, loud "clonk" from the top of the engine when turning off, rattling that sounds like "marbles in a tin can" — loudest on cold start, decreasing as the engine warms up.

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

Repair cost: £500–£1,200 (supercharger coupler replacement).

Replacement cost: N/A — repair only; if left for many thousands of miles, supercharger performance will degrade.

🟡 Monitor - book inspection soon if you hear rattling or the "clonk".

Our recommendation:

The supercharger coupler/torsion isolator is a known wear item on the AJ126. The good news is that a worn coupler is normally nothing to worry about and is just annoying. However, if it is left for many thousands of miles, it will eventually wear so much that supercharger performance will degrade. If you hear the characteristic "clonk" when turning off the engine or a "marbles in a tin can" rattle on cold start, have the coupler inspected.

3. Timing Chain Tensioner Wear

Symptoms: Rattling timing chains — much more regular and higher pitched than a coupler rattle, worse with a cold engine. Can eventually lead to a stretched or skipped chain, causing pistons to hit valves and destroying the engine.

Typical mileage: 80,000–120,000 miles.

Repair cost: £1,500–£3,500 (chain, tensioner, and guide replacement).

Replacement cost: N/A — repair only; if the chain snaps, it's an interference engine — catastrophic failure requiring full engine replacement.

🔴 Immediate - at first sign of metallic rattle on cold start, book inspection today.

Our recommendation:

The AJ126 is nowhere near as bad for timing chain failure as the early 5.0-litre AJ133 V8, but timing chains can still be a problem. The number one enemy of these engines is oil sludge build-up. To prevent timing chain issues, change the engine oil far more often than the scheduled 16,000-mile interval — roughly every 8,000 miles. If you hear a regular, high-pitched rattle on cold start, book an inspection immediately.

Weighing Your Options?

Compare Specialist Quotes When You're Ready

12 vetted Land Rover specialists, each experienced with the complex AJ126 supercharged V6, with a 12-month warranty as standard.

See Range Rover Velar P340 Engine Options

Range Rover Velar P340 — 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 Velar P340 — 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 SenseCoolant expansion tank crack✅ Yes£200–£800Simple, cheap fix — do it immediately to avoid overheatingThermostat housing leak✅ Yes£300–£800Well-known failure point — repair when symptoms appearSupercharger coupler wear✅ Yes£500–£1,200Cost-effective repair — prevents performance degradationTiming chain tensioner wear✅ Yes (if caught early)£1,500–£3,500Preventative — catches fault before catastrophic failureSnapped timing chain❌ Usually NoEngine replacementInterference engine — piston-valve contact means little is left to repair

Buying This P340? Check These First

Buy If

No coolant warnings or evidence of coolant leaks
Full service history with oil changes every 8,000 miles or less (not the 16,000-mile interval)
Supercharger coupler inspected and confirmed healthy
No rattling or "clonk" from the supercharger area

Avoid If

Coolant warning lights or evidence of leaks — cooling system issues are common
Rattling from the engine — could be timing chain or supercharger coupler wear
Poor service history — these engines are sensitive to oil sludge build-up
Overheating or coolant loss — can cause warped cylinder heads or full engine failure

Closing Verdict

The AJ126 is a great engine when properly maintained, but its cooling system requires attention and it is sensitive to oil sludge build-up. Coolant warnings are extremely common and should never be ignored. A £7,000 reconditioned engine on a Velar valued at £20,000 is 35% of the car's value — worth it for a well-maintained example. On a sub-£12,000 example, think carefully. The 60% Land Rover scrap threshold applies.

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

→ Compare Range Rover Velar P340 engine prices before you buy

Don't Guess. Compare.

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→ Compare Range Rover Velar P340 engine prices before you buy

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Buying Checklist

Before you buy a used Land Rover Range Rover Velar P340 (or before you commit to an engine replacement), check these:

Coolant Level — Check for low coolant or visible leaks — the most common issue

Coolant Warning — Any intermittent "Coolant Level Low" warnings?

Cold Start — Listen for rattling on startup (timing chain or supercharger coupler wear)

Supercharger Noise — Any "clonk" when turning off? "Marbles in a tin can" rattle?

Service History — Oil changes every 8,000 miles (not the 16,000-mile interval)

Engine Bay — Check for coolant residue or crusted coolant on hoses

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

MOT History — Check for emissions failures and corrosion

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.

306PS (AJ126)

Years2017–2020

Power340 PS (250 kW)

2025 Enquiries— (pattern data)

Avg. Recon Cost£4,500–£11,000 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

306PS (AJ126)2017–2020340 PS (250 kW)— (pattern data)£4,500–£11,000 [PLACEHOLDER]

Technical Specs

Displacement2,995 cc

CylindersV6, 24-valve DOHC

Compression Ratio10.5:1

Fuel SystemDirect injection

SuperchargerEaton M112

→ Compare Range Rover Velar P340 engine prices for your Land Rover

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Market Intelligence

Most Common Failure

Cooling system — expansion tank cracks, thermostat housing leaks, water pump failures

Average Enquiry Mileage

70,000

miles 【PATTERN DATA】

Average Replacement Cost

£7,000

reconditioned, supply only 【PLACEHOLDER — confirm vs cost sheet】

Most Requested Engine Code

306

PS (AJ126) — only code for this badge 【PATTERN DATA】

Peak Enquiry Season

Summer — cooling system issues more apparent in hot weather 【PATTERN DATA】

Regional Demand

South East24%

South West18%

London (16%) 【PATTERN DATA】

Regional Demand Breakdown

24%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 Range Rover Velar P340 Owners Trust LandRoverEngine.uk

Trusted Range Rover Velar P340 Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real Velar owners, with specialists who genuinely understand the AJ126 supercharged V6 — including its cooling system, supercharger coupler, and timing chain vulnerabilities.
Compare Range Rover Velar P340 Engine Replacement Companies
see prices, warranty terms and supply & fit options side-by-side before you commit, all from specialists experienced with this complex 3.0-litre supercharged V6.
UK Engine Replacement Services for P340
supply-only or full supply & fit available nationwide, covering everything from cooling system repair to full engine swaps on your Velar L560.

Find the best Land Rover Range Rover Velar P340 engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and keep your supercharged V6 Velar on the road with confidence.

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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