What are the signs of coolant or water pump failure in a Range Rover Sport 3.0 SC-

The AJ126 V6 is prone to plastic coolant crossover pipe degradation and water pump failure. Early warning signs include unexplained coolant loss, sweet smells from the engine bay, overheating warnings, or white smoke from the exhaust. - Monitor the coolant reservoir for unexplained drops in level. - Check for external leaks around the water pump and crossover pipes. - Address overheating warnings immediately to prevent catastrophic internal damage.

Range Rover Sport 3.0 SC SPECIALISTS

Range Rover Sport 3.0 SC Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK Range Rover Sport 3.0 SC engine specialists. Compare prices on reconditioned, rebuilt and used engines to ensure a reliable and cost-effective replacement for your premium performance SUV.

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Range Rover Sport 3.0 SC Engine

from£6,000 to £9,500...

Usedfrom £2,500
Reconditionedfrom £4,500
Common codesAJ126

Land Rover range-rover-sport 3.0 SC Used Engine — AJ126

Land Rover range-rover-sportUsed Engine — AJ126

Land Rover range-rover-sport 3.0 SC Reconditioned Engine — AJ126

Land Rover range-rover-sportReconditioned Engine — AJ126

Land Rover range-rover-sport 3.0 SC Rebuilt Engine — AJ126

Land Rover range-rover-sportRebuilt Engine — AJ126

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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

Range Rover Sport 3.0 SC Engine History & Specs at a Glance

When the 3.0 SC (badged Si6) was introduced to the L494 Range Rover Sport, it offered a compelling blend of supercharged V6 performance and everyday usability, serving as the entry-level petrol option before the transition to four-cylinder Ingenium and mild-hybrid architectures.

2015
AJ126 (3.0L SC), 3.0L, 340hp (Introduced as the Si6 petrol option for the L494 Range Rover Sport, featuring a roots-type supercharger for immediate throttle response).
2017
Phased out in favour of the 2.0L Si4 (PT204) and later the 3.0L P400 MHEV to meet stricter emissions targets.

Every engine fitted to the Range Rover Sport 3.0 SC is covered below, with UK rebuilt pricing and known failure points.

Engine Codes & Pricing

Range Rover Sport 3.0 SC Engine Codes Specifications & Replacement Cost

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

AJ126 — 3.0L Supercharged Petrol (2015-2017)

Power Output: 340hp
Years Fitted: 2015-2017

Can’t find your exact engine code?-> Get quotes for AJ126 Range Rover Sport 3.0 SC engine replacement

-> Get quotes for AJ126 Range Rover Sport 3.0 SC engine replacement

Common Problems

Range Rover Sport 3.0 SC Engine Problems Repair Cost vs Replacement

The Range Rover Sport 3.0 SC (Si6) delivers supercharged V6 performance, but its cooling system and supercharger drivetrain introduce specific wear points. The AJ126 engine dominates replacement demand for mid-2010s petrol Sports, primarily due to coolant crossover leaks and timing chain tensioner wear. Rebuilt engines through EnginesMarket include upgraded components addressing these original failure points, plus a minimum 12-month unlimited-mileage warranty.

Common failure points and repair options

Coolant Crossover Pipe Leaks & Water Pump Failure

Affected: Range Rover Sport 3.0 SC (AJ126, 2015-2017)
Typical failure mileage: 60,000-120,000 miles

Root cause

The plastic coolant crossover pipes and water pump impellers degrade under high underbonnet temperatures, leading to sudden coolant loss and potential overheating if not addressed promptly.

Repair options

Repair tier	Dealer price	Specialist price
Water Pump & Crossover Pipe Replacement	£1,200-£2,000	£800-£1,500
Full Replacement - rebuilt/reconditioned engine	£8,000-£11,500	£6,000-£9,500

Our recommendation

For isolated coolant leaks, specialist pipe and water pump replacement with upgraded components is highly cost-effective. However, if the engine has overheated, a rebuilt unit provides a comprehensive, warrantied reset.

-> Compare rebuilt AJ126 Range Rover Sport 3.0 SC engine prices

Timing Chain Tensioner & Supercharger Coupler Wear

Affected: Range Rover Sport 3.0 SC (AJ126, 2015-2017)
Typical failure mileage: 70,000-120,000 miles

Root cause

The timing chain tensioners can wear over time, leading to a distinct cold-start rattle, while the supercharger coupler can degrade, causing a whining noise from the top of the engine and reduced boost efficiency.

Repair options

Repair tier	Dealer price	Specialist price
Tensioner & Supercharger Coupler Replacement	£1,500-£2,500	£1,000-£1,800
Full Replacement - rebuilt/reconditioned engine	£8,000-£11,500	£6,000-£9,500

Our recommendation

If the cold-start rattle is minor and boost pressure is unaffected, specialist tensioner and coupler replacement is cost-effective. For significant noise, performance loss, or high mileage, a rebuilt engine with upgraded components provides a comprehensive, warrantied reset.

-> Compare rebuilt AJ126 Range Rover Sport 3.0 SC engine prices

Don't Let Engine Failure Write Off Your Range Rover Sport 3.0 SC

Protect your premium investment with a rebuilt engine that addresses the AJ126's known cooling and supercharger weaknesses. Every engine supplied through our network features upgraded components, comes with a minimum 12-month unlimited mileage warranty, and is available with nationwide supply and fit to get your Range Rover Sport back on the road.

Compare Range Rover Sport 3.0 SC Engine Replacement Prices Now ->

FAQ

Range Rover Sport 3.0 SC Engine ReplacementFrequently Asked Questions

Everything Range Rover Sport 3.0 SC owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

A fully rebuilt Range Rover Sport 3.0 SC AJ126 engine typically costs between £6,000 and £9,500 for supply only, with supply and fit packages ranging from £8,000 to £11,500 depending on the specialist.

Supply-only rebuilt: £6,000-£9,500 [EM-QUOTE]
Supply & fit: £8,000-£11,500 [ESTIMATED]
Always ensure the quote includes a minimum 12-month warranty.

-> Compare Range Rover Sport 3.0 SC engine replacement quotes today.

The AJ126 V6 is prone to plastic coolant crossover pipe degradation and water pump failure. Early warning signs include unexplained coolant loss, sweet smells from the engine bay, overheating warnings, or white smoke from the exhaust.

Monitor the coolant reservoir for unexplained drops in level.
Check for external leaks around the water pump and crossover pipes.
Address overheating warnings immediately to prevent catastrophic internal damage.

-> If you notice these symptoms, get a Range Rover Sport 3.0 SC engine quote immediately.

Yes, the 3.0 SC AJ126 is generally considered more reliable than the 5.0L AJ133 V8. While both share some supercharger and cooling system characteristics, the AJ126 avoids the severe timing chain tensioner and oil consumption issues that plague the high-output 5.0L V8 at higher mileages.

The AJ126 has fewer catastrophic bottom-end failure reports.
Cooling system maintenance is critical for both engines.
Rebuilt AJ126 units include upgraded preventative components.

-> Check Range Rover Sport 3.0 SC rebuilt engine prices now.

Yes, investing in a rebuilt engine is financially sound. With Range Rover Sport 3.0 SC values currently ranging from £12,000 to over £25,000 depending on condition, a £6,000-£9,500 replacement is well within the vehicle's value band and preserves this premium asset.

Premium Range Rover Sport values easily absorb rebuild costs.
A rebuilt engine resets the mechanical lifespan with upgraded components.
Upgraded cooling and supercharger parts prevent repeat failures.

-> Get quotes for direct-fit Range Rover Sport 3.0 SC engines here.

A standard supply and fit service for a Range Rover Sport 3.0 SC typically takes 3 to 5 days at a specialist workshop. The complex supercharger system and tight engine bay require meticulous removal and calibration.

Removal and installation: 2-3 days.
Fluid top-up, system bleeding, and ECU calibration: 1-2 days.
Always confirm turnaround times with your chosen specialist.

-> Book your Range Rover Sport 3.0 SC supply and fit service today.

Why Choose Us

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Comparing quotes is completely free and carries no obligation. By entering your registration, you ensure that the quotes you receive are specifically matched to your exact Range Rover Sport 3.0 SC and its unique AJ126 engine code, connecting you directly with vetted UK specialists who understand premium performance SUVs.

500+500+ Premium Range Rover Sport engines supplied through our network

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