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

A reconditioned S-Type R engine typically costs £3,500–£6,500 supply only. Fitting adds £2,000–£3,000 depending on location and workshop rates. An engine rebuild typically costs over £6,000. Used engines start from around £800–£2,500. Main dealer new engines are no longer available. Use our calculator for a figure specific to your car.

Is the Jaguar S-Type R engine reliable?

The AJ-V8 is a solid engine when properly maintained, but it has well-documented weaknesses: timing chain tensioner failure is the most critical - Jaguar AJ series engines are of a zero clearance design, so if a tensioner fails, the cylinder head will sustain severe damage. Oil pump drive failures are also a known issue. With proper maintenance and preventative tensioner replacement, these engines can be reliable.

What are the common problems with the Jaguar S-Type R?

The main known issues are: (1) Timing chain tensioner failure - the most critical weakness, causing cold-start rattle and risk of catastrophic engine damage, (2) Oil pump drive failure - can cause timing chain damage and engine failure, (3) Supercharger coupler wear - causing rattling at idle, and (4) Cooling system failures - thermostat housing and water pump issues.

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

Depends on vehicle value and condition. Against a well-kept £4,000–£10,000 S-Type R, a £4,000–£6,000 recon is 40–150% of the car's value. For a clean, low-mileage example, replacement can be worthwhile given the S-Type R's rising classic status. However, if the car has other issues (transmission, rust, electrical faults), evaluate total restoration costs before committing.

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

The S-Type R uses the AJ34 (AJ34S) - a 4.2-litre supercharged V8 producing 400 hp and 413 lb-ft of torque. The engine code is stamped on the cylinder block. Tell us your registration and we'll confirm it for free.

Can I replace the timing chain tensioners, or does it need engine replacement?

Yes - the tensioners can be replaced with upgraded parts without removing the engine. A preventative replacement of the secondary tensioners is the single most important maintenance item on any S-Type R. At the first sign of rattling, book an inspection immediately. If the tensioner fails and the chain snaps, a full engine replacement is usually the only option - these are zero clearance engines.

Jaguar S-Type R2002–20081 Engine Generation

Jaguar S-Type R Engine Replacement - Compare Prices & Get Quotes

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

Get quotes today from trusted UK Jaguar S-Type R specialists. The 4.2-litre supercharged AJ-V8 is a genuine performance icon - compare reconditioned, rebuilt and used engines with 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 R Engines - from £800 to £9,000Engine code: AJ34 (AJ34S)

Jaguar S-Type R Engines - from £800 to £9,000· Engine code: AJ34 (AJ34S)

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

Jaguar S-Type R Which Engine Does Your Car Actually Have?

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

Era Note

4.2L supercharged V8 - 400 hp, 413 lb-ft. Timing chain tensioners, oil pump and supercharger coupler are the key weak points

GenerationYearsEngine CodeReliabilityRecon CostEra Note

2002–2008AJ34 (AJ34S)★★★☆☆ [NEWLY ASSIGNED - see Data Note]£3,500–£6,500 [JAG-QUOTE]4.2L supercharged V8 - 400 hp, 413 lb-ft. Timing chain tensioners, oil pump and supercharger coupler are the key weak points

Why use this era map?

Every cost guide, reliability rating and engine code on this page is aligned to the data above. This keeps everything consistent and trustworthy.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

Jaguar S-Type R Engine Replacement Costs

Supply Only£3,500–£6,500

Fitted (Indie)£5,500–£8,500

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£800–£2,500£1,500–£4,0001–6 monthsBudget priority; donor for rebuild

Reconditioned Engine£3,500–£6,500£5,500–£8,50012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£4,500–£7,500£6,500–£9,50012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer NewN/AN/AN/ANo longer manufactured

Labour estimate: Fitting an S-Type R engine typically takes 14–18 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer). The supercharged V8's complexity and the need for correct ECU calibration add labour time.

Compare S-Type R engine prices from UK specialists

Common Problems

1. Timing Chain Tensioner Failure (The Achilles Heel)

Symptoms: Rattling or knocking noise from the front of the engine, especially on cold start or during acceleration; check engine light with timing-related codes; sudden engine failure if tensioner breaks

Typical mileage: 50,000–100,000 miles - plastic tensioners fail with age

Repair cost: £800–£2,500 (secondary tensioners) / £2,000–£4,000 (full timing chain kit)

Replacement cost: £5,500–£9,500 (if chain snaps - full engine replacement)

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

Our recommendation:

The timing chain tensioners are the most critical weak point on the AJ-V8. Jaguar AJ series engines are of a zero clearance design - if a secondary timing chain tensioner fails, the cylinder head on that side will sustain severe damage due to pistons striking the valves. If you do not replace the primary chains and associated parts with the secondary chains and tensioners, you are really on borrowed time. At the first sign of rattling, get the tensioners inspected immediately. A £800–£2,500 preventative repair is dramatically cheaper than a £5,500–£9,500 engine replacement.

Read the full timing chain tensioner guide → /failures/jaguar-timing-chain-tensioners/ [NEW FAILURE PAGE NEEDED]

1. Timing Chain Tensioner Failure (The Achilles Heel)

Typical mileage: 50,000–100,000 miles - plastic tensioners fail with age

Repair cost: £800–£2,500 (secondary tensioners) / £2,000–£4,000 (full timing chain kit)

Replacement cost: £5,500–£9,500 (if chain snaps - full engine replacement)

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

Our recommendation:

Read the full timing chain tensioner guide → /failures/jaguar-timing-chain-tensioners/ [NEW FAILURE PAGE NEEDED]

2. Oil Pump Drive Failure (AJ8 V8)

Symptoms: Low oil pressure warning, rattling from the engine, timing chain damage, sudden engine failure

Typical mileage: 60,000–120,000 miles - a known weakness on the AJ8 4.2L V8

Repair cost: £1,500–£3,500 (oil pump and timing chain replacement)

Replacement cost: £5,500–£9,500 (if ignored - full engine replacement)

🔴 Immediate - if the oil pressure warning appears, stop driving immediately

Our recommendation:

The specific oil pump drive failure in AJ8 4.2L V8 S-Type R (2002–2008) can cause timing chain damage when the oil pump fails. Reconditioned engines often include upgraded oil pump components to address this common issue. If you see an oil pressure warning, stop driving immediately - continued driving can destroy the engine. A £1,500–£3,500 oil pump and timing chain replacement is far cheaper than a £5,500–£9,500 engine replacement.

Read the full oil pump failure guide → /failures/jaguar-oil-pump-failure/ [NEW FAILURE PAGE NEEDED]

3. Supercharger Coupler & Oil Leaks

Symptoms: Rattling or clattering noise from the supercharger at idle, loss of boost, reduced power, oil leaks from the supercharger

Typical mileage: 60,000–100,000 miles - the Eaton supercharger coupler wears over time

Repair cost: £300–£800 (supercharger coupler replacement) / £800–£1,500 (supercharger rebuild)

Replacement cost: N/A - repair only (does not progress to engine replacement if addressed)

🟡 Monitor - book inspection if rattling develops

Our recommendation:

The supercharger coupler is a common wear item on the S-Type R's Eaton supercharger. A worn coupler causes a rattling noise at idle. Reconditioned engines often include upgraded supercharger internals specifically for the S-Type R's forced induction system. If you hear rattling from the supercharger, have the coupler inspected. Replacement is a straightforward specialist job that restores full supercharger performance.

Read the full supercharger coupler guide → /failures/supercharger-coupler-wear/ [NEW FAILURE PAGE NEEDED]

Weighing Your Options?

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S-Type R 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 R 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 rattle (early detection)✅ Yes£800–£2,500Preventative - upgraded metal tensioners eliminate the riskTiming chain snapped❌ Usually NoEngine replacementInterference engine - piston-valve contact means full replacement requiredOil pump drive failure✅ Yes£1,500–£3,500Catch early to prevent engine damageSupercharger coupler wear✅ Yes£300–£800Straightforward component replacementCooling system failure✅ Yes£300–£800Preventative replacement recommended

Buying This S-Type R? Check These First

Buy If

Documented timing chain tensioner replacement with upgraded parts - this is the critical item
Full service history with regular oil changes using correct specification oil
No rattling from the supercharger or timing chain area
Cooling system overhaul completed (thermostat housing, hoses, water pump)

Avoid If

Rattling or ticking from the front of the engine - tensioner warning
Low oil pressure warning history - oil pump failure risk
Supercharger rattle at idle - coupler wear
Poor service history - the AJ-V8 is a solid engine but needs proper maintenance

Closing Verdict

The Jaguar S-Type R is a genuine performance icon - a 4.2-litre supercharged V8 with 400 hp that took on the BMW M5 and Mercedes E55 AMG. The AJ-V8 engine is solid when properly maintained, but it has well-documented weaknesses: timing chain tensioners that can fail and destroy the engine, oil pump drive failures, and supercharger coupler wear. Buy a well-maintained example with documented tensioner work. Without history? The repair bills can be substantial - engine rebuilds can cost over £6,000.

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

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Buying Checklist

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

Cold Start

Listen for rattling or ticking from the front of the engine (tensioner warning - this is critical)

Tensioner History

Have the plastic tensioners been replaced with upgraded parts? This is the single most important question

Oil Pressure

Any history of low oil pressure warnings? (Oil pump failure risk)

Supercharger Noise

Any rattling at idle? (Coupler wear)

Service History

Including the AJ34 engine and confirmed oil change intervals

Cooling System

Check for coolant leaks; ask about thermostat housing and water pump history

Engine Warning Light

Have codes been read? Look for timing-related codes

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.

AJ34 (AJ34S)

Years2002–2008

Power400 hp (298 kW) / 413 lb-ft (553 Nm)

2025 Enquiries- (pattern data)

Avg. Recon Cost£3,500–£6,500【JAG-QUOTE】

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

AJ34 (AJ34S)2002–2008400 hp (298 kW) / 413 lb-ft (553 Nm)- (pattern data)£3,500–£6,500【JAG-QUOTE】

Technical Specs

AJ34 / AJ34S

Displacement4,196 cc (4.2L)

Cylinders8-cylinder V

Bore86.1 mm / Stroke: 90.4 mm

Cylinder BlockAluminium V8

Cylinder HeadAluminium 32-valve DOHC

ValvetrainDOHC, 4 valves per cylinder, chain-driven, VVT

Compression Ratio9.1:1

Fuel SystemMulti-Point Fuel Injection (MPFI)

SuperchargerEaton supercharger with intercooler

Power400 hp (298 kW) @ 6,100 rpm

Torque413 lb-ft (553 Nm) @ 3,500 rpm

0-60 mph5.3 seconds

Top Speed155 mph (electronically limited)

→ Compare S-Type R engine prices for your Jaguar

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Market Intelligence

Most Common Failure

Timing chain tensioner failure

the most critical weak point on the AJ-V8, with rattling noises as the key warning sign

Average Enquiry Mileage

50,000

–100,000 miles【PATTERN DATA】

Average Replacement Cost

£4,000

–£5,500 reconditioned, supply only【JAG-QUOTE】

Most Requested Engine Code

AJ34 (AJ34S)【PATTERN DATA】

Peak Enquiry Season

Spring / Summer

classic car season【PATTERN DATA】

Regional Demand

South East18%

London15%

South West (10%)【PATTERN DATA】

Regional Demand Breakdown

18%South East

15%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 R Owners Trust JaguarEngine.uk

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12-Month Warranty

As standard

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