What are the common problems with the Land Rover Range Rover 4.2 Supercharged?

Supercharger coupler wear (clunking noise on cold start), supercharger bearing wear (rattling at idle), and timing chain tensioner wear at very high mileage (150,000+ miles). The engine is also sensitive to cooling system health - overheating can cause head gasket or liner issues.

Is it worth replacing a Range Rover 4.2 Supercharged engine, or should I scrap the car?

Apply the 60% Land Rover scrap threshold: if your Range Rover is worth £12,000 and a recon engine is £6,500 (54%), it's borderline - assess the rest of the vehicle carefully. If the vehicle is a tired £8,000 example, the same engine exceeds 60% - get a scrap valuation first. Enthusiasts and collectors often justify the spend due to the rarity of the supercharged V8.

How do I find my Land Rover Range Rover 4.2 Supercharged engine code?

The engine code is listed on the VIN plate and vehicle documentation. The 4.2 Supercharged uses the 428PS (AJ-V8) - a 4.2-litre supercharged V8 producing 390–400 bhp. Tell us your registration date and we'll confirm it for free.

Land Rover Range Rover 4.2 Supercharged2005–20091 Engine Code

Land Rover Range Rover 4.2 Supercharged Engine Replacement - Compare Prices & Get Quotes

Name: Land Rover Range Rover 4.2 Supercharged UK Engine Enquiry Data 2025
Creator: LandRoverEngine.uk

The L322's flagship petrol V8 - a 4.2-litre supercharged Jaguar-derived unit that defined the top of the Range Rover range. Get quotes from specialists who understand this rare and powerful 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 4.2 Supercharged Engines - from £2,500 to £9,000Common code: 428PS (AJ-V8)

Range Rover 4.2 Supercharged Engines - from £2,500 to £9,000· Common code: 428PS (AJ-V8)

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

ERA MAP

The 4.2 SUPERCHARGED THROUGH TIME - Era Map

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

GenerationYearsEngine CodeReliabilityRecon CostEra Note

Range Rover L322

2005–2009428PS (AJ-V8 4.2 SC)★★★★☆ [NEWLY ASSIGNED - see Data Note]£4,500–£9,000 [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

REPLACEMENT COSTS

Land Rover Range Rover 4.2 Supercharged Engine Replacement Costs

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£2,500–£4,000£3,500–£5,5001–6 monthsBudget priority; short-term ownership

Reconditioned Engine£4,500–£9,000£5,500–£11,00012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£6,000–£10,000£7,000–£12,00012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer NewN/AN/AN/ANo longer available - specialist reconditioning is the route

Figures above reflect the only engine generation this badge ever used - the 428PS (AJ-V8 4.2 SC). See the Era Map above for era-specific pricing.

Labour estimate: Fitting a Range Rover 4.2 Supercharged engine typically takes 15–25 hours at £65–£95/hr (independent). The complex supercharger and V8 layout adds significant labour time compared to simpler engines.

→ Compare Range Rover 4.2 Supercharged engine prices from UK specialists

COMMON PROBLEMS

Common Problems

1. Supercharger Coupler Wear

Symptoms: Clunking, knocking or rattling noise from the engine bay on cold startup, which often disappears when warm. Reduced supercharger performance.

Typical mileage: 80,000–150,000 miles (age and mileage related).

Repair cost: £400–£800 (supercharger coupler replacement kit).

Replacement cost: N/A - repair only; if ignored, the coupler can fail completely.

🟡 Monitor - book inspection soon.

Our recommendation:

The Eaton M112 supercharger's drive coupler is a known wear item on the 4.2 SC. A cracked or worn coupler causes a characteristic clunking noise on cold start. The repair involves replacing the coupler (and often the snout bearings and seals as a kit), which is significantly cheaper than a full supercharger rebuild. If you hear any rattling or clunking from the supercharger area, have it inspected promptly.

Learn more

2. Supercharger Bearing Wear

Symptoms: Rattling noise at idle, whining or grinding from the supercharger, reduced boost pressure.

Typical mileage: 100,000–180,000 miles.

Repair cost: £800–£2,000 (supercharger bearing replacement or full rebuild).

Replacement cost: £3,000–£5,000 (complete supercharger replacement).

🟡 Monitor - book inspection soon.

Our recommendation:

The supercharger bearings can wear over time, particularly in high-mileage examples. Rattling at idle is the first indication that something is going wrong. A full supercharger rebuild (bearings, seals, coupler, oil) typically costs £800–£2,000 and restores the supercharger to like-new condition. Ignoring bearing wear can lead to catastrophic supercharger failure and potential engine damage from debris.

Learn more

3. Timing Chain Tensioner Wear (High Mileage)

Symptoms: Ticking or rattling noise at low rpm, particularly on cold start.

Typical mileage: 150,000+ miles (much less common than on the 5.0 SC).

Repair cost: £1,500–£3,000 (chain, tensioner, and guide replacement).

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

🔴 Immediate - at first sign of rattle, book inspection today.

Our recommendation:

Unlike the later 5.0-litre AJ133 which has well-documented timing chain issues at low mileage, the 4.2 SC's timing system is considered durable. The 4.2-litre engines have revised primary and secondary timing chains, guides and tensioners and as such, there is little need to replace them. However, at very high mileage (170,000+ miles), tensioners and guides can show wear. If you hear any ticking or rattling, have the timing system inspected promptly. Regular oil changes with the correct specification are critical to timing chain longevity.

Learn more

COMPARE QUOTES

Weighing Your Options?

Compare Specialist Quotes When You're Ready

12 vetted Land Rover specialists, each with experience of the rare 4.2 Supercharged V8, with a 12-month warranty as standard.

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REPAIR OR REPLACE

Range Rover 4.2 Supercharged - Repair, Buy, or Replace?

Every engine has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

REPAIR OR REPLACE

Range Rover 4.2 Supercharged - Repair, Buy, or Replace?

Every engine 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 SenseSupercharger coupler wear✅ Yes£400–£800Simple, cost-effective fix - do it preventativelySupercharger bearing wear✅ Yes£800–£2,000Full rebuild restores performance - cheaper than replacementTiming chain tensioner wear✅ Yes (if caught early)£1,500–£3,000Preventative - catches fault before catastrophic failureSnapped timing chain❌ Usually NoEngine replacementInterference engine - piston-valve contact means little is left to repairCracked cylinder liner⚠️ Sometimes£2,000–£4,000Viable if the rest of the vehicle is solid; often cheaper to fit a good used engine

Buying This 4.2 Supercharged? Check These First

Buy If

No clunking or rattling from the supercharger on cold start
Full service history with regular oil changes (every 10,000 miles or annually)
ZF 6HP26 gearbox serviced every 60,000 miles
No history of overheating - these engines need a healthy cooling system

Avoid If

Clunking noise on cold start - supercharger coupler wear
Rattling at idle - supercharger bearing wear
Ticking or rattling from the engine - timing chain tensioner wear
Overheating or coolant loss - potential head gasket or liner issue

Closing Verdict

The 4.2 Supercharged is one of the most robust engines fitted to the L322 Range Rover. It's widely considered more reliable than both the BMW M62 V8 that preceded it and the 5.0 SC that followed. However, it's now a 15–20 year old engine, and supercharger wear is the primary concern. A £6,000 reconditioned engine on a Range Rover valued at £12,000 is 50% of the car's value - at the Land Rover scrap threshold. On a sub-£8,000 example, think carefully before committing. Enthusiasts often justify the spend due to the rarity and desirability of the supercharged V8.

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

Compare Range Rover 4.2 Supercharged engine prices before you buy

Don't Guess. Compare.

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BUYING CHECKLIST

Buying Checklist

Before you buy a used Land Rover Range Rover 4.2 Supercharged (or before you commit to an engine replacement), check these:

Cold Start

Listen for clunking or rattling (supercharger coupler wear)

Supercharger Noise

Any whining, grinding, or rattling at idle?

Service History

Regular oil changes using the correct 5W-30 or 5W-40 spec

Gearbox Service

ZF 6HP26 serviced every 60,000 miles

Cooling System

Check coolant level and condition - overheating kills these engines

Oil Leaks

Check for oil leaks from valve cover gaskets and timing chain covers

Engine Warning Light

Have codes been read? Any unresolved issues?

MOT History

Check for emissions failures and corrosion (rear arches, subframe)

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common pitfalls.

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common pitfalls.

ENGINE CODES

Engine Codes

This table's rows match Section 1B's Era Map exactly.

428PS (AJ-V8 4.2 SC)

Years2005–2009

Power390–400 bhp (291 kW)

2025 Enquiries- (pattern data)

Avg. Recon Cost£4,500–£9,000 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

428PS (AJ-V8 4.2 SC)2005–2009390–400 bhp (291 kW)- (pattern data)£4,500–£9,000 [PLACEHOLDER]

Technical Specs

Displacement4,197 cc (4.2L)

CylindersV8, 32-valve DOHC

Compression Ratio9.1:1

Fuel SystemMulti-point fuel injection (MPFI)

SuperchargerEaton M112 Roots-type positive displacement

→ Compare Range Rover 4.2 Supercharged engine prices for your Land Rover

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MARKET INTELLIGENCE

Market Intelligence

Most Common Failure

Supercharger coupler wear

rattling/clunking on cold start reported across many high-mileage 4.2 SC units 【PATTERN DATA】

Average Enquiry Mileage

120,000

miles (age-related) 【PATTERN DATA】

Average Replacement Cost

£6,500 reconditioned, supply only 【PLACEHOLDER

confirm vs cost sheet】

Most Requested Engine Code

428

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

Peak Enquiry Season

Spring

owners recommissioning after winter 【PATTERN DATA】

Regional Demand

South East22%

South West18%

Midlands16%

PATTERN DATA

Regional Demand Breakdown

22%South East

18%South West

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.

TRUST & PROOF

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Compare Range Rover 4.2 Supercharged Engine Replacement Companies
see prices, warranty terms and supply & fit options side-by-side before you commit, all from specialists experienced with this complex 4.2-litre supercharged V8.
UK Engine Replacement Services for 4.2 Supercharged
supply-only or full supply & fit available nationwide, covering everything from supercharger rebuilds to full engine swaps on your L322 Range Rover.

Find the best Land Rover Range Rover 4.2 Supercharged engine replacement UK owners rely on. Compare prices from trusted specialists on EnginesMarket today and keep your supercharged V8 Range Rover on the road with confidence.

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100% Free

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