How much does a Land Rover Defender 110 P425 engine replacement cost-

A reconditioned or rebuilt Land Rover Defender 110 P425 engine typically costs between £4,500 and £10,000 for the supply-only unit, depending on the level of rebuild and specialist documentation provided. - Rebuilt units include upgraded cooling components and timing chain checks. - Supply and fit packages are available through our premium specialist network.

What are the signs of cooling or timing chain failure in a Land Rover Defender 110 P425-

Early detection is critical to preventing catastrophic damage to your Land Rover Defender 110 P425 engine. - Look for unexplained coolant loss, sudden overheating warnings, or a distinct rattling noise from the front of the engine at cold start. - Sweet-smelling exhaust smoke or oil contamination are also strong indicators of internal failure.

Is it worth replacing the engine in a modern Land Rover Defender 110 P425-

Yes, given the strong retained values of the L663 Defender, replacing the engine is a highly sound financial decision. - A typical 2020+ model is valued between £55,000 and £85,000+, making a £6,500-£10,000 rebuild a small percentage of the vehicle's worth. - A rebuilt engine with a 12-month warranty adds reliability and protects your premium asset.

How long does a Land Rover Defender 110 P425 engine supply and fit take-

A straightforward supply and fit replacement for a Land Rover Defender 110 P425 typically takes 3 to 5 days at a premium specialist workshop. - This allows time for the engine to be delivered, mounted, and thoroughly calibrated and tested. - Complex cases requiring additional cooling system upgrades may take slightly longer.

Can I upgrade my Land Rover Defender 110 to a P425 engine-

While the L663 chassis was designed with multiple powertrain options, a retrofit is not straightforward. - The P425 3.0L MHEV requires extensive ECU mapping, bespoke wiring harnesses, and upgraded cooling systems to function correctly and pass MOT. - We strongly recommend sticking to a like-for-like replacement to ensure guaranteed compatibility, reliability, and warranty coverage.

Land Rover Defender 110 P425 Specialists

Land Rover Defender 110 P425 Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK Land Rover Defender 110 P425 engine specialists. Compare prices on reconditioned, rebuilt and used engines to find the best value for your high-performance 4x4.

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Land Rover Defender 110 P425 Engine

from£6,500 to £10,00...

Usedfrom £2,500
Reconditionedfrom £4,500
Common codes306PS, AJ20P6

Land Rover defender-110 P425 Used Engine — 306PS / AJ20P6

Land Rover defender-110Used Engine — 306PS / AJ20P6

Land Rover defender-110 P425 Reconditioned Engine — 306PS / AJ20P6

Land Rover defender-110Reconditioned Engine — 306PS / AJ20P6

Land Rover defender-110 P425 Rebuilt Engine — 306PS / AJ20P6

Land Rover defender-110Rebuilt Engine — 306PS / AJ20P6

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How it works

3 Simple Steps to Finding the Right Replacement Engine

Clear information first, then the right engine and specialist for your exact vehicle.

Variant History

Land Rover Defender 110 P425 Engine History & Specs at a Glance

When the P425 was introduced to the L663 Defender 110 lineup, it represented the sweet spot of modern JLR performance, pairing a refined 3.0-litre inline-six mild-hybrid petrol engine with the iconic 110 chassis for exceptional on-road dynamics and robust off-road capability.

2020
306PS (2996cc), 425hp, launched alongside the new L663 Defender 110, featuring an integrated starter-generator (ISG) 48V mild-hybrid system for seamless stop-start and torque fill.
2023
Present - Continued production with minor calibration updates and the introduction of new special editions (e.g., 75th Edition), maintaining the same robust 3.0L Ingenium petrol architecture.

Every engine fitted to the Land Rover Defender 110 P425 is covered below, with UK rebuilt pricing and known failure points.

Engine Codes & Pricing

Land Rover Defender 110 P425 Engine Codes Specifications & Replacement Cost

Find your exact engine code, specs and UK replacement cost guide.

306PS / AJ20P6 — 3.0L Petrol MHEV (2020-present)

Power Output: 425hp
Years Fitted: 2020-present

Can’t find your exact engine code?-> Get quotes for 306PS Land Rover Defender 110 P425 engine replacement

-> Get quotes for 306PS Land Rover Defender 110 P425 engine replacement

Common failure points and repair options

Cooling System Leaks & Water Pump Wear

Affected: Land Rover Defender 110 P425 (306PS, 2020-present)
Typical failure mileage: 60,000-100,000 miles

Root cause

Plastic coolant fittings and water pump seals can degrade under high under-bonnet temperatures, leading to slow coolant loss and potential overheating if ignored.

Repair options

Repair tier	Dealer price	Specialist price
Minor/Preventative	£1,200-£2,000	£800-£1,500
Full Replacement - rebuilt/reconditioned engine	£8,000-£12,000	£6,500-£10,000

Our recommendation

If the engine is fundamentally sound, addressing cooling components or the timing chain as preventative maintenance is highly cost-effective and preserves the original unit. However, if the vehicle has suffered severe overheating or exhibits deep mechanical knocking, a full reconditioned replacement is the only reliable path to protect your investment.

Timing Chain Tensioner Stretch

Affected: Land Rover Defender 110 P425 (306PS, 2020-present)
Typical failure mileage: 80,000+ miles

Root cause

High cylinder pressures and thermal cycling can cause premature wear on the timing chain guides and tensioners, resulting in a rattling noise at cold start.

Repair options

Repair tier	Dealer price	Specialist price
Chain Kit Replacement	£2,000-£3,500	£1,500-£2,500
Full Replacement - rebuilt/reconditioned engine	£8,000-£12,000	£6,500-£10,000

Our recommendation

-> Compare rebuilt 306PS Land Rover Defender 110 P425 engine prices

Don't Let Engine Failure Write Off Your Land Rover Defender 110 P425

Protect your high-performance investment with a rebuilt engine that features upgraded components and a comprehensive 12-month unlimited-mileage warranty. By comparing quotes from our vetted UK specialist network, you avoid main dealer premiums while securing nationwide supply and fit options tailored to your exact Land Rover Defender 110 P425.

Compare Land Rover Defender 110 P425 Engine Replacement Prices Now ->

FAQ

Land Rover Defender 110 P425 Engine ReplacementFrequently Asked Questions

Everything Land Rover Defender 110 P425 owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

A reconditioned or rebuilt Land Rover Defender 110 P425 engine typically costs between £4,500 and £10,000 for the supply-only unit, depending on the level of rebuild and specialist documentation provided.

Rebuilt units include upgraded cooling components and timing chain checks.
Supply and fit packages are available through our premium specialist network.

-> Compare Land Rover Defender 110 P425 engine replacement prices

Early detection is critical to preventing catastrophic damage to your Land Rover Defender 110 P425 engine.

Look for unexplained coolant loss, sudden overheating warnings, or a distinct rattling noise from the front of the engine at cold start.
Sweet-smelling exhaust smoke or oil contamination are also strong indicators of internal failure.

-> Get a diagnostic quote for your Land Rover Defender 110 P425

Yes, given the strong retained values of the L663 Defender, replacing the engine is a highly sound financial decision.

A typical 2020+ model is valued between £55,000 and £85,000+, making a £6,500-£10,000 rebuild a small percentage of the vehicle's worth.
A rebuilt engine with a 12-month warranty adds reliability and protects your premium asset.

-> Check Land Rover Defender 110 P425 rebuild viability

While the L663 chassis was designed with multiple powertrain options, a retrofit is not straightforward.

The P425 3.0L MHEV requires extensive ECU mapping, bespoke wiring harnesses, and upgraded cooling systems to function correctly and pass MOT.
We strongly recommend sticking to a like-for-like replacement to ensure guaranteed compatibility, reliability, and warranty coverage.

-> Get quotes for a compatible Land Rover Defender 110 P425 engine

Why Choose Us

Compare Land Rover Defender 110 P425 Engine Prices Today

Comparing quotes is completely free and carries no obligation. By entering your registration, you ensure that every quote you receive is precisely matched to your Land Rover Defender 110 P425 and its specific 306PS engine code, connecting you directly with vetted UK premium Land Rover specialists.

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