How much does an AJ20P6 (Ingenium 3.0 I6 Petrol / P400) engine replacement cost?

A reconditioned AJ20P6 Ingenium petrol typically costs £4,500–£7,500 supply only, varying by specification and rebuild quality. Used units can be found from £2,500–£4,500, but provenance is critical. Fitting adds £1,000–£2,000 depending on labour rates.

Is the AJ20P6 (Ingenium 3.0 I6 Petrol / P400) a reliable engine?

The AJ20P6 is a modern and capable straight-six petrol (4.0★) with positive real-world feedback. Early examples have reported cooling system issues, but JLR has addressed many of these with software updates and revisions. Regular maintenance is essential.

What is the most common AJ20P6 failure?

Cooling system issues are the most common reported problems — including water pump leaks, coolant hose failures, and occasional thermostat housing cracks. Other reported issues include oil leaks from the timing cover and occasional software glitches in the MHEV system.

Which Land Rover models use the AJ20P6?

The AJ20P6 (P400) powers the latest-generation Range Rover (L460), Range Rover Sport (L461), and Defender (L663).

Is the Land Rover AJ20P6 the same as Jaguar's version?

Yes — the AJ20P6 is shared with Jaguar fitments in the F-Pace, XF, and XJ. The engine is mechanically identical, though ECU calibrations and ancillaries differ by model.

Land RoverAJ20P6 / P400 (Ingenium 3.0 I6)Petrol3.0L I6 MHEV Turbo2019–present

Land Rover AJ20P6 (Ingenium 3.0 I6 Petrol / P400) Engine – Specs, Reliability & Replacement Cost

The AJ20P6 is JLR's modern straight-six petrol – smooth, powerful and efficient, but cooling system monitoring is essential. Backed by 160+ real UK enquiries in 2025 [EM-VERIFIED].

Compare AJ20P6 (Ingenium 3.0 I6 Petrol) Engine Prices

Land Rover AJ20P6 (Ingenium 3.0 I6 Petrol / P400) Engine – Specs, Reliability & Replacement Cost

Compare AJ20P6 (Ingenium 3.0 I6 Petrol) Engine Prices

160+
Enquiries
3
Models
Fitted
72/100
Engine
Score
Part of Engine Finders

At a Glance

All the essential specifications, performance data, and compatibility information at a glance.

Engine Family

AJ20P6 / P400 (Ingenium 3.0 I6 Petrol)

Fuel

Petrol

Power Range

400 hp [THIRD-PARTY]

Overall Engine Score

72/100

★★★★☆

Configuration / Displacement

3.0L I6 MHEV Turbo

Modern turbodiesel four-cylinder engine with proven architecture.

Years Produced

2019–present

Over a decade of production and continuous development.

Models Fitted (BMW only)

Fitted across a wide range of BMW vehicles and body styles.

Cross-Brand Fitment

Also fitted to Jaguar (F-Pace, XF, XJ)

The N47 engine is engineered exclusively for BMW vehicles.

BMW-Verified Data

Verified using real UK enquiries and workshop data.

Real-World Insights

Based on 1,450+ UK enquiries in 2025.

Trusted by Enthusiasts

Part of Engine Finders - UK's leading engine specialists.

Quality You Can Trust

Every engine is checked, inspected and quality assured.

Engine Family

AJ20P6 / P400 (Ingenium 3.0 I6 Petrol)

Fuel

Petrol

Configuration /
Displacement

3.0L I6 MHEV Turbo

Power Range

400 hp [THIRD-PARTY]

Years Produced

2019–present

Models Fitted (BMW only)

Cross-Brand Fitment

Also fitted to Jaguar (F-Pace, XF, XJ)

Overall Engine Score

72/100

★★★★☆

Verdict & Rating

Rating:

out of 5

82% confidence – based on 160+ real UK enquiries, specialist workshop reports, and JLR service data for this relatively new engine family.

The AJ20P6 is a refined, powerful modern straight-six petrol – cooling system vigilance is the key to longevity – buy with full JLR service history and enjoy the power.

Best for:

Avoid if:

Engine Score breakdown:

DimensionScore (of 20)

Reliability

Star rating (4.0★) × 4 = 16

16 /20

Repair Cost

Midpoint of Reconditioned (Supply Only) range: £4,500–£7,500 → £6,000 midpoint → falls in £5,000–£6,999 bracket → 12

12 /20

Repairability

Modern I6 with 48V MHEV adds complexity; repairs require specialist knowledge and diagnostic equipment

12 /20

Parts Supply

AJ20P6 parts availability improving but some components are JLR-specific; shared with Jaguar aids supply chain

12 /20

Replacement Economics

Reconditioned cost (£6,000 midpoint) as % of lowest typical vehicle value (Defender L663 ~£35,000+) = 17% → falls under 30% → 20

20 /20

Total Engine Score

72 / 100

Rating:

out of 5

82% confidence – based on 160+ real UK enquiries, specialist workshop reports, and JLR service data for this relatively new engine family.

The AJ20P6 is a refined, powerful modern straight-six petrol – cooling system vigilance is the key to longevity – buy with full JLR service history and enjoy the power.

Engine Score breakdown:

DimensionScore (of 20)

Reliability

Star rating (4.0★) × 4 = 16

16 /20

Repair Cost

Midpoint of Reconditioned (Supply Only) range: £4,500–£7,500 → £6,000 midpoint → falls in £5,000–£6,999 bracket → 12

12 /20

Repairability

Modern I6 with 48V MHEV adds complexity; repairs require specialist knowledge and diagnostic equipment

12 /20

Parts Supply

AJ20P6 parts availability improving but some components are JLR-specific; shared with Jaguar aids supply chain

12 /20

Replacement Economics

Reconditioned cost (£6,000 midpoint) as % of lowest typical vehicle value (Defender L663 ~£35,000+) = 17% → falls under 30% → 20

20 /20

Total Engine Score

72 / 100

Best for:

Avoid if:

Compatibility

Jaguar Engine engines are fitted across 3+ models from 2020–2022.

Jaguar Exclusive Engine

This is an exclusive Jaguar engine. No cross-platform sharing.

2020

2 Years of Production

2022

Land

Rover Range Rover

L460

P400 (AJ20P6)

2022–20221 Variants →

Land

Rover Range Rover Sport

L461

P400 (AJ20P6)

2022–20221 Variants →

Land

Rover Defender

L663

P400 (AJ20P6)

2020–20201 Variants →

Other Jaguar Models

Engine also appears in limited variants and markets.

View full details →

Compatibility Verified

All compatibility data verified from Jaguar parts catalogues and specialist databases. [JAGUAR-VERIFIED]

Land

Rover Range Rover

Generation

L460

Variant/Badge

P400 (AJ20P6)

Years

2022–present

Land

Rover Range Rover Sport

Generation

L461

Variant/Badge

P400 (AJ20P6)

Years

2022–present

Land

Rover Defender

Generation

L663

Variant/Badge

P400 (AJ20P6)

Years

2020–present

Other Jaguar Models

Engine also appears in limited variants and markets.

View full details ›

Compatibility Verified

All compatibility data verified from Jaguar parts catalogues and specialist databases. [JAGUAR-VERIFIED]

Also powers the Jaguar F-Pace, XF, and XJ → [Jaguar AJ20P6 page].

Cost Guide

All prices are estimates from UK specialists [JAGUAR-QUOTE]

Fitting an AJ20P6 typically takes 12–16 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer) [EM-QUOTE].

Parts cost is identical across Land Rover and Jaguar applications; labour time varies by model and engine bay access.

USED

Supply Only

£2,500–£4,500

Fitted (Indie)

£3,500–£5,900

Varies by supplier

Cost Guide

All prices are estimates from UK specialists

[JAGUAR-QUOTE]

USED

Supply Only

£2,500–£4,500

Fitted (Indie)

£3,500–£5,900

Warranty

Varies by supplier

FAQ

Expert answers to the most common BMW Engine engine questions.

Why Owners Trust Us

Trusted Suppliers

Every garage and engine rebuilder in our network is vetted, rated and reviewed by real AJ20P6 owners, as part of the Engine Finders network.

Compare Companies

We compare genuine reconditioned and used engine prices from vetted UK specialists – so you see the real market, not just one garage's quote.

UK Coverage

From Cornwall to the Highlands, our specialist network covers the whole UK with expert AJ20P6 knowledge.

Find the best Land Rover AJ20P6 (Ingenium 3.0 I6 Petrol / P400) engine replacement UK owners rely on. Compare real prices from trusted specialists on EnginesMarket today and get back on the road with confidence.

Compare Land Rover AJ20P6 (Ingenium 3.0 I6 Petrol / P400) Engine Prices Now →

Trusted Suppliers

Every garage and engine rebuilder in our network is vetted, rated and reviewed by real AJ20P6 owners, as part of the Engine Finders network.

Compare Companies

We compare genuine reconditioned and used engine prices from vetted UK specialists – so you see the real market, not just one garage's quote.

UK Coverage

From Cornwall to the Highlands, our specialist network covers the whole UK with expert AJ20P6 knowledge.

Find the best BMW Engine engine replacement UK drivers rely on.

Compare real prices from trusted specialists on EnginesMarket today and get back on the road with confidence.

Compare Land Rover AJ20P6 (Ingenium 3.0 I6 Petrol / P400) Engine Prices Now