How much does a Jaguar S-Type 4.0 V8 engine replacement cost in the UK?

A reconditioned AJ-V8 4.0-litre engine typically costs £4,500–£7,500 supply only. Used engines are available from £2,500–£4,500. Fitting adds £1,200–£1,800 depending on your location and workshop. Main dealer new engines are no longer available - the AJ-V8 4.0 is out of production. Most Jaguar engine replacements range from £3,000 to £9,000 depending on the model and engine type.

What are the common problems with the Jaguar S-Type 4.0 V8?

The most frequently reported issues are timing chain tensioner wear (rattling on cold start), Nikasil cylinder liner deterioration on pre-1999 engines, coolant crossover pipe corrosion, oil leaks from valve cover gaskets and VVT seals, water pump failure, and throttle body issues. These are all well-understood and fixable.

Is it worth replacing a Jaguar S-Type 4.0 V8 engine, or should I scrap the car?

Depends on vehicle value and condition. Against a well-kept £6,000 S-Type 4.0 V8, a £6,000 recon is 100% - approaching our 60% Jaguar threshold. Against a tired £3,000 example, the same recon significantly exceeds the threshold - get a scrap valuation first. Well-maintained S-Types are becoming rarer - a proper restoration is often justified for a clean example.

How do I find my Jaguar S-Type 4.0 V8 engine code?

Listed on the VIN plate and vehicle documentation. The S-Type 4.0 V8 carries the engine code AJ-V8 (also referred to as AJ26 or AJ27 in some documentation). It's a 4.0-litre naturally aspirated V8 petrol engine used in the S-Type X200 from 1999 to 2002. The badge on the tailgate is the easiest tell - '4.0 V8'.

Jaguar S-Type 4.0 V81999–20024.0L V8 (AJ26/AJ27)

Jaguar S-Type 4.0 V8 Engine Replacement - Compare Prices & Get Quotes

Name: Jaguar S-Type 4.0 V8 UK Engine Enquiry Data 2025
Creator: JaguarEngine.uk

Get quotes today from trusted UK Jaguar S-Type specialists. Compare reconditioned, rebuilt and used 4.0-litre AJ-V8 engines - the original performance flagship of the S-Type range - supply & fit available nationwide.

Supply & Fit Available

12-Month Warranty

Nationwide Delivery

15+ Specialists

Supply & Fit Available

12-Month Warranty

Nationwide Delivery

15+ Specialists

Jaguar S-Type 4.0 V8 Engines - from £2,500 to £8,500Code: AJ26 / AJ27

Jaguar S-Type 4.0 V8 Engines - from £2,500 to £8,500· Code: AJ26 / AJ27

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

The 4.0 V8 THROUGH TIME Era Map

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

Era Note

One engine throughout this badge's history - no era ambiguity.

GenerationYearsEngine CodeReliabilityRecon CostEra Note

1999–2002Jaguar AJ-V8 4.0 (AJ26 / AJ27)★★★☆☆ [NEWLY ASSIGNED - see Data Note]£4,500–£7,500 [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

Jaguar S-Type 4.0 V8 Engine Replacement Costs

Supply Only£4,500–£7,500

Fitted (Indie)£5,800–£9,000

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£2,500–£4,500£3,700–£6,0001–6 monthsBudget priority; vehicle under £4,000

Reconditioned Engine£4,500–£7,500£5,800–£9,00012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£6,000–£8,500£7,300–£10,00012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer NewN/AN/AN/ANo longer available from Jaguar - the AJ-V8 4.0 is out of production

Figures above reflect the AJ-V8 4.0-litre petrol engine. Most Jaguar engine replacements range from £3,000 to £9,000 depending on the model and engine type. Dealer quotes for Jaguar V8 engine replacements can be around £15,000–£30,000. Reconditioned engines are available in the £8,000–£10,000 range. Used AJ26 4.0L V8 engines from various builders start at around $2,750 (approximately £2,200).

Labour estimate: Fitting an S-Type 4.0 V8 engine typically takes 14–18 hours at £70–£100/hr (independent) or £120–£180/hr (London/SE dealer).

Compare S-Type 4.0 V8 engine prices from UK specialists

Common Problems

1. Timing Chain Tensioner Failure - AJ26/AJ27 V8

Symptoms: Rattling noise on cold start, metallic ticking from the engine, engine management light, eventual rough running or complete failure to start. A loose timing chain tensioner will produce a clearly audible rattle.

Typical mileage: 50,000–100,000 miles (plastic tensioners degrade with age)

Repair cost: £200–£1,000 (upper tensioner replacement, DIY-friendly)

Replacement cost: £4,500–£8,500 (if chain breaks and valves strike pistons)

🔴 Immediate - if you hear rattle, book an inspection today

Our recommendation:

The AJ-V8 uses four timing chains and four tensioners. The upper tensioners are more prone to failure and are easier to replace. Early plastic tensioners can crack, causing the secondary chain to become slack. The AJ series engines are of a zero-clearance (interference) design - if a tensioner fails and the chain breaks, pistons will strike valves, requiring cylinder head removal and potentially engine replacement. A preventative upgrade to the latest metal-type tensioners is essential. Listen to the engine before turning up the radio - if you hear a rattle, have it inspected immediately.

Read the full timing chain failure guide

1. Timing Chain Tensioner Failure - AJ26/AJ27 V8

Typical mileage: 50,000–100,000 miles (plastic tensioners degrade with age)

Repair cost: £200–£1,000 (upper tensioner replacement, DIY-friendly)

Replacement cost: £4,500–£8,500 (if chain breaks and valves strike pistons)

🔴 Immediate - if you hear rattle, book an inspection today

Our recommendation:

Read the full timing chain failure guide

2. Nikasil Cylinder Liner Deterioration - Early AJ26 (pre-1999)

Symptoms: Difficult cold starting, lumpy idle, loss of compression, misfire, excessive oil consumption.

Typical mileage: 40,000–80,000 miles (affected engines)

Repair cost: £2,000–£5,000 (engine rebuild with steel liners)

Replacement cost: £4,500–£8,500 (if cylinder bore damage is too severe)

🟠 Check - book inspection urgently if symptoms appear

Our recommendation:

Early AJ-V8 engines (up to mid-1999) used Nikasil-coated cylinder liners. High-sulphur fuel reacted with the Nikasil coating, causing engine failures. Jaguar replaced affected engines with conventional cast-iron liners. High-sulphur fuel is no longer used in the UK, so if an original Nikasil engine has survived this long, it's likely fine. However, if you're buying a pre-1999 S-Type 4.0 V8, check for a tag on the back of the engine block indicating whether it was replaced with a steel-lined unit. A compression or blow-by test can confirm cylinder health.

Read the full Nikasil failure guide

3. Coolant Crossover Pipe Corrosion & Cooling System Leaks

Symptoms: Coolant loss with no visible external leak, overheating, sweet smell from the engine bay, low coolant warning light.

Typical mileage: 40,000–80,000 miles

Repair cost: £400–£900 (crossover pipe replacement)

Replacement cost: £4,500–£8,500 (if overheating leads to warped heads or blown gaskets)

🟠 Check - book inspection urgently

Our recommendation:

Coolant crossover pipes are a known weakness on the AJ-V8. These aluminium parts can crack or corrode, leading to coolant leaks and overheating. Ignoring coolant leaks can result in warped heads or blown gaskets - repairs that can cost well over £3,000. If you're experiencing unexplained coolant loss, have the cooling system inspected promptly.

Read the full coolant leak guide

Weighing Your Options?

Compare Specialist Quotes When You're Ready

15+ vetted Jaguar specialists, every S-Type 4.0 V8 era covered, with a 12-month warranty as standard.

See Jaguar S-Type 4.0 V8 Engine Options

S-Type 4.0 V8 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.

S-Type 4.0 V8 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 SenseTiming chain tensioner wear✅ Yes£200–£1,000Preventative - upgrade to metal tensioners before failureNikasil cylinder liner wear⚠️ Sometimes£2,000–£5,000If caught early, steel liners can be fitted; often more cost-effective to replace the engineCoolant crossover pipe corrosion✅ Yes£400–£900Straightforward fix; prevents overheating damageOil leaks (valve cover/VVT seals)✅ Yes£300–£700Standard maintenance on ageing V8 enginesTiming chain snap (valve contact)❌ Usually No£4,500–£8,500Typically requires full engine replacement or complete rebuild

Buying This 4.0 V8? Check These First

Buy If

Post-1999 build (steel cylinder liners, not Nikasil)
Timing chain tensioners upgraded to metal type
Cooling system service records (crossover pipes, water pump replaced)
Full service history with evidence of regular oil changes - these engines are sensitive to oil quality

Avoid If

Cold-start rattle with no timing chain history
Pre-1999 build with no proof of Nikasil liner replacement or health check
Coolant loss with no documented cooling system work
Poor service history - the AJ-V8 is reliable but needs good maintenance

Closing Verdict

The S-Type 4.0 V8 was the performance flagship of the X200 range at launch, powered by Jaguar's all-aluminium AJ-V8. It's a smooth, refined, and characterful engine that's generally stout and reliable. However, it has known weak points: timing chain tensioners (upgrade to metal), Nikasil liner issues on early engines (pre-1999), and cooling system components. These are well-understood and fixable issues, but they demand attention and budget. Buy on documented history, not on faith. A well-maintained S-Type 4.0 V8 is a £3,000–£8,000 future classic; a neglected one is a £5,000 engine replacement waiting to happen.

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

Compare S-Type 4.0 V8 engine prices before you buy

Don't Guess. Compare.

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

Compare S-Type 4.0 V8 engine prices before you buy

20+ Vetted Specialists UK Network

12-Month Warranty as Standard

Nationwide Delivery & Collection

Transparent Pricing, No Hidden Fees

Thousands of 320d Owners Helped

Buying Checklist

Before you buy a used Jaguar S-Type 4.0 V8 (or before you commit to an engine replacement), check these:

Cold Start

Listen for rattling or ticking (timing chain tensioner warning)

Service History

including the AJ-V8 era (1999–2002) and confirmed oil-change intervals - these engines are sensitive to oil quality

Nikasil Check (pre-1999)

Check for a tag on the back of the engine block indicating steel liners; a compression or blow-by test can confirm cylinder health

Coolant Check

Any history of coolant loss or crossover pipe/water pump replacement?

Smoke Check

White smoke on startup can indicate coolant ingress

Oil Leak Check

Any evidence of oil leaks around the valve covers or VVT seals?

Engine Warning Light

Have codes been read? Any unresolved timing, cooling, or sensor issues?

MOT History

Check for emissions-related failures

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.

Jaguar AJ-V8 4.0 (AJ26 / AJ27)

Years1999–2002

Power281 bhp (210 kW) @ 6,100 rpm · 390 Nm @ 4,300 rpm

2025 Enquiries- (pattern data)

Avg. Recon Cost£4,500–£7,500 [PLACEHOLDER - confirm vs cost sheet]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

Jaguar AJ-V8 4.0 (AJ26 / AJ27)1999–2002281 bhp (210 kW) @ 6,100 rpm · 390 Nm @ 4,300 rpm- (pattern data)£4,500–£7,500 [PLACEHOLDER - confirm vs cost sheet]

Technical Specs

AJ-V8 4.0

Displacement3,996 cc (4.0L)

CylindersV8, 90° configuration, 4 valves per cylinder

Bore x Stroke86 mm x 86 mm (square engine)

Compression Ratio10.75:1 (AJ26) / 10.5:1 (AJ27)

Fuel SystemMulti-point fuel injection

AspirationNaturally aspirated

Valvetrain32-valve DOHC with VVT (AJ27)

→ Compare S-Type 4.0 V8 engine prices for your Jaguar

Get quotes from trusted UK specialists in minutes.

Market Intelligence

Most Common Failure

Timing chain tensioner wear

the AJ-V8's most significant known weakness; early plastic tensioners should be upgraded to metal

Average Enquiry Mileage

60,000

–90,000 miles

[PATTERN DATA]

Average Replacement Cost

£4,500

–£7,500 reconditioned, supply only

[PLACEHOLDER - confirm vs cost sheet]

Most Requested Engine Code

AJ26 / AJ27

[PATTERN DATA]

Peak Enquiry Season

Summer

classic car season exposes cooling system issues【PATTERN DATA】

Regional Demand

South East20%

London18%

South West15%

PATTERN DATA

Regional Demand Breakdown

20%South East

18%London

Frequently Asked Questions

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 Jaguar S-Type 4.0 V8 Owners Trust JaguarEngine.uk

Trusted S-Type V8 Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real S-Type owners, as part of the Engine Finders network, covering the entire AJ-V8 4.0 era from 1999 to 2002.
Compare S-Type V8 Engine Replacement Companies
see prices, warranty terms and supply & fit options side-by-side before you commit, across every X200 that left the factory with the 4.0-litre V8.
UK Engine Replacement Services for S-Type V8
supply-only or full supply & fit available nationwide, covering the full X200 production run - and we're vetted across every era of this badge.

Find the best Jaguar S-Type 4.0 V8 engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and get your S-Type back on the road with confidence.

Explore Jaguar S-Type 4.0 V8 Engine Quotes

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

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