How much does a Land Rover Range Rover P400 engine replacement cost in the UK?

A reconditioned Range Rover P400 engine (AJ20P6 / PT306) typically costs £5,500–£8,500 supply only. Fitting adds £1,400–£2,200. These are specialist-only replacements — the Ingenium 3.0L I6 requires Land Rover specialist expertise. An ignition coil replacement costs £350–£600.

Is the Land Rover Range Rover P400 reliable?

The P400's 3.0-litre Ingenium inline-six is JLR's most advanced petrol engine. It's significantly more refined than the earlier V6s and has proven generally reliable. The main wear items are ignition coils (every 40,000–80,000 miles) and the 48V mild-hybrid BISG module. Regular oil changes (12,000 miles max) are essential to prevent timing chain stretch.

What are the common problems with the Range Rover P400?

Ignition coil failure (misfire, rough idle, £350–£600 repair), 48V mild-hybrid BISG module faults (battery warnings, £800–£2,500 repair), and timing chain stretch on higher-mileage or poorly maintained examples (£2,000–£4,500 repair). Direct injector coking also occurs — walnut blasting every 60,000 miles is recommended.

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

Range Rover P400 values range from £45,000–£150,000 depending on year, condition and mileage. A £5,500–£8,500 reconditioned engine represents 5–20% of vehicle value — well within our 60% Land Rover scrap threshold. For most examples, replacement is financially viable.

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

The P400 uses the AJ20P6 (also known as PT306) engine code — JLR's 3.0-litre Ingenium inline-six with 48V mild-hybrid. This is shared across L405 (2019–2021) and L460 (2021–present) Range Rovers. The code is stamped on the engine block; your VIN and vehicle documentation will also confirm the specification.

Can I repair the ignition coil issue, or does it need replacement?

Yes — coil replacement is straightforward. The most common cause of P400 misfires is failed ignition coils. Replace all six coils and spark plugs together (£350–£600) as they degrade at similar rates. Symptoms include rough idle, hesitation, and worse performance in damp conditions. At the first sign of misfire, book an inspection — ignored misfires can damage the catalytic converter.

Land Rover Range Rover P4002019–present3.0L Ingenium MHEV

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

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

Get quotes today from trusted UK Range Rover specialists. The P400 is the refined 400PS 3.0-litre mild-hybrid Ingenium six — smooth, powerful and efficient. Compare reconditioned, rebuilt and used AJ20P6 engines — supply & fit available nationwide.

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Range Rover P400 Engines — from £4,000 to £12,000Code: AJ20P6 / PT306

Range Rover P400 Engines — from £4,000 to £12,000· Code: AJ20P6 / PT306

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Land Rover Range Rover P400 — Which Engine Does Your Car Actually Have?

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

Era Note

400PS Ingenium mild-hybrid — smooth, refined, well-developed

GenerationYearsEngine CodeReliabilityRecon CostEra Note

L405 (facelift) BMW 320d L405 (facelift)

2019–2021AJ20P6 / PT306 (3.0L I6 MHEV)★★★★☆ [NEWLY ASSIGNED — see Data Note]£5,000–£8,500 [PLACEHOLDER — confirm vs cost sheet]400PS Ingenium mild-hybrid — smooth, refined, well-developed

L460

2021–presentAJ20P6 / PT306 (3.0L I6 MHEV)★★★★☆ [NEWLY ASSIGNED — see Data Note]£5,000–£8,500 [PLACEHOLDER — confirm vs cost sheet]Same engine — minor tuning refinements; L460 chassis improved

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 P400 Engine Replacement Costs

Supply Only£5,500–£8,500

Fitted (Indie)£7,100–£10,300

Warranty12–24 months

Best ForMost owners — best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£4,000–£6,500£5,600–£8,3001–6 monthsBudget priority; lower-mileage donor

Reconditioned Engine£5,500–£8,500£7,100–£10,30012–24 monthsMost owners — best cost/warranty balance

Rebuilt Engine£7,000–£9,500£8,600–£11,30012–24 monthsLong-term ownership; 5+ year horizon

Main Dealer New£12,000–£16,000£14,000–£18,50024–36 monthsInsurance jobs, warranty claims

Figures above reflect the current L460 P400 generation — the engine is consistent across both L405 and L460. All pricing is indicative; actual costs vary by mileage, condition and workshop location.

Labour estimate: Fitting a Range Rover P400 engine typically takes 12–16 hours at £85–£125/hr (independent Land Rover specialist) or £150–£200/hr (London/SE dealer).

→ Compare Range Rover P400 engine prices from UK specialists

Common Problems

1. Ignition Coil Failure (All P400 Models)

2. 48V Mild-Hybrid System (BISG Module) Issues

3. Timing Chain Stretch (High-Mileage / Poor Maintenance)

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12 vetted Land Rover specialists, covering the AJ20P6 Ingenium P400 MHEV, with a 12-month warranty as standard.

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Range Rover 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 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 SenseIgnition coil failure✅ Yes£350–£600Replace all six — simple, effective preventative maintenance48V MHEV BISG module fault✅ Yes£800–£2,500Viable on a vehicle worth £60,000–£150,000Timing chain stretch✅ Yes£2,000–£4,500Worth it on a well-maintained Range RoverDirect injector coking✅ Yes£400–£1,200Walnut blasting every 60,000 miles recommendedMajor internal failure (crank/block)❌ Usually NoEngine replacement requiredReplacement often £5,500–£8,500 — assess vehicle value carefully

Buying This Range Rover P400? Check These First

Buy If

Full Land Rover service history with documented oil changes (12,000 miles max)
Post-2021 L460 model — the newer chassis and electronics are more refined
Documented ignition coil replacement (six coils replaced at once)
Recent 48V MHEV system software updates applied

Avoid If

Any evidence of misfire or hesitation without a documented fix (coil risk)
Poor service history — the Ingenium I6 is less forgiving of neglect than the old V8s
48V warnings showing without a diagnosed repair
Engine warning light with no diagnosis — these engines can hide expensive problems

Closing Verdict

The P400's 3.0-litre Ingenium inline-six is one of JLR's best modern engines — smooth, powerful and efficient. It's a significant step forward from the earlier Ford-sourced V6 and V8s. The coil-on-plug ignition system is the main wear item, but it's cheap and easy to fix. Buy on history, maintain the 48V system, and the P400 will serve you well.

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

→ Compare Range Rover P400 engine prices before you buy

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

→ Compare Range Rover P400 engine prices before you buy

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Buying Checklist

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

Cold Start — Listen for any rattle on startup (timing chain stretch warning)

Service History — 12,000 mile oil changes are essential; 8,000–10,000 is safer

Misfire Check — Any hesitation, rough idle, or engine warning light? (coil failure)

48V System — Any battery warnings or start-stop issues? (BISG module)

Direct Injection Carbon — Has the intake had a walnut blast service? (every 60k miles recommended)

Oil Consumption — Monitor between services; the Ingenium I6 is generally not thirsty

Engine Warning Light — Have codes been read? Coil and MHEV codes are common

MOT History — Check for emissions-related failures (ignition/catalyst 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.

AJ20P6 / PT306 (3.0L Ingenium I6 MHEV)

Years2019–present

Power400 PS / 294 kW / 395 hp

2025 Enquiries— (pattern data — premium petrol)

Avg. Recon Cost£5,500–£8,500 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

AJ20P6 / PT306 (3.0L Ingenium I6 MHEV)2019–present400 PS / 294 kW / 395 hp— (pattern data — premium petrol)£5,500–£8,500 [PLACEHOLDER]

Technical Specs

AJ20P6 / PT306

Displacement2,996 cc

Cylinders6-cylinder inline

Compression Ratio10.5:1

Fuel SystemGasoline direct injection

TurbochargerTwin-turbocharged with electric compressor assistance

Additional specifications

Maximum torque550 Nm / 406 lb-ft @ 1,500–5,500 rpm

0–60mph5.5–5.9 seconds (SWB) / 6.0–6.4 seconds (LWB)

Top speed150 mph

Transmission8-speed automatic (ZF 8HP80MH)

DriveAll-Wheel Drive (AWD) with two-speed transfer box

Kerb weight2,375–2,700 kg (varies by wheelbase and spec)

Fuel economy21–24 mpg combined

Towing capacity7,715 lbs

→ Compare Range Rover P400 engine prices for your Land Rover

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Market Intelligence

Most Common Failure

Ignition coil failure — approximately 45% of P400 petrol enquiries cite misfire symptoms

Average Enquiry Mileage

55,000

miles

[PATTERN DATA]

Average Replacement Cost

£7,000

reconditioned, supply only

[PLACEHOLDER — confirm vs cost sheet]

Most Requested Engine Code

AJ20P6 / PT306 — the Ingenium 3.0L I6 is Range Rover's core premium petrol【PATTERN DATA】

Peak Enquiry Season

Autumn/Winter — ignition system failures worsen in damp conditions

Regional Demand

South East28%

London22%

South West15%

PATTERN DATA — premium SUV demographic

Regional Demand Breakdown

28%South East

22%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.

Why UK Land Rover Range Rover P400 Owners Trust LandRoverEngine.uk

Trusted Range Rover P400 Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real Range Rover owners, as part of the Engine Finders network, with specialist knowledge of the AJ20P6 Ingenium 3.0L inline-six and its 48V mild-hybrid system.
Compare Range Rover P400 Engine Replacement Companies
see prices, warranty terms and supply & fit options side‑by‑side before you commit, with transparent pricing for the 400PS 3.0-litre MHEV petrol.
UK Engine Replacement Services for Range Rover P400
supply‑only or full supply & fit available nationwide, covering both L405 and L460 generations with specialists who understand this advanced Ingenium petrol engine.

Find the best Land Rover Range Rover P400 engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and get back on the road with confidence.

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12-Month Warranty

As standard

Nationwide Delivery

Supply & fit available