How much does a Jaguar XKR engine replacement cost in the UK?

A reconditioned XKR engine typically costs £4,000–£7,000 supply only, with the 5.0-litre AJ133 variant at the higher end. Fitting adds £1,000–£1,800 depending on the specialist. Customers have reported dealer quotes of around £15,000–£30,000 for engine replacement, while reconditioning or rebuilding is often in the £8,000–£10,000 range. Use our calculator for a figure specific to your XKR.

What are the common problems with the Jaguar XKR?

The 4.0-litre AJ26S: plastic timing chain tensioners that can fail catastrophically. The 4.2-litre AJ34S: rubber coolant valley pipes that degrade with age. The 5.0-litre AJ133: timing chain tensioner failure - pre-2013 cars most at risk. All engines: supercharger coupler wear (rattling at idle - aftermarket coupler costs around £20).

Is it worth replacing an XKR engine, or should I scrap the car?

Depends on the vehicle value and engine era. Against a well-kept X150 worth £20,000–£30,000, a £6,000–£8,000 recon is 20–30% of the car's value - often worth it. Against a tired X100 with significant body issues, the same recon may exceed our 60% Jaguar threshold - get a scrap valuation first. The 4.2-litre cars are generally considered the most reliable and command a premium.

How do I find my Jaguar XKR engine code?

X100 (1998–2002): AJ26S (4.0 SC). X100 (2002–2006): AJ34S (4.2 SC). X150 (2007–2014): AJ133 (5.0 SC). Check the VIN plate or vehicle documentation.

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

The tensioners and guides must be replaced if worn. For the 4.0-litre, upgrading to metal tensioners is essential (£800–£2,000). For the 5.0-litre, a timing chain kit with revised components is required (£2,000–£4,000). A snapped chain almost always destroys the engine. At the first sign of cold-start rattle, book an inspection immediately.

Jaguar XKR1998–20143 Engine Generations

Jaguar XKR Engine Replacement - Compare Prices & Get Quotes

Name: Jaguar XKR UK Engine Enquiry Data 2025
Creator: JaguarEngine.uk

Get quotes today from trusted UK Jaguar XKR specialists. Compare reconditioned, rebuilt and used supercharged V8 engines - from the 4.0-litre AJ26S to the 5.0-litre AJ133 - supply & fit available nationwide.

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Jaguar XKR Engines - from £1,500 to £12,000Common codes: AJ26S, AJ34S, AJ133

Jaguar XKR Engines - from £1,500 to £12,000· Common codes: AJ26S, AJ34S, AJ133

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

The XKR THROUGH TIME Era Map

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

Era Note

370 bhp, 387 lb-ft; plastic timing chain tensioners are the critical weakness - catastrophic if they fail

GenerationYearsEngine CodeReliabilityRecon CostEra Note

1998–2002AJ26S (4.0 SC V8)★★☆☆☆ [NEWLY ASSIGNED - see Data Note]£3,500–£6,000 [PLACEHOLDER - confirm vs cost sheet]370 bhp, 387 lb-ft; plastic timing chain tensioners are the critical weakness - catastrophic if they fail

2002–2006AJ34S (4.2 SC V8)★★★★☆ [NEWLY ASSIGNED - see Data Note]£4,000–£7,000 [PLACEHOLDER - confirm vs cost sheet]390–420 bhp; robust cast-iron sleeved V8; rubber coolant valley pipes are the main watch item

2007–2014AJ133 (5.0 SC V8)★★★☆☆ [NEWLY ASSIGNED - see Data Note]£5,500–£12,000 [PLACEHOLDER - confirm vs cost sheet]510 bhp; timing chain tensioner failure is the critical weakness - pre-2013 cars most at risk

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 XKR Engine Replacement Costs

Supply Only£4,000–£7,000

Fitted (Indie)£5,000–£8,500

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£1,500–£3,500£2,300–£4,7001–6 monthsBudget priority; vehicle under £10,000

Reconditioned Engine£4,000–£7,000£5,000–£8,50012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£6,500–£12,000£7,500–£13,50012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer New£14,000–£18,000£15,500–£20,00024–36 monthsInsurance jobs, warranty claims

Figures above reflect current XKR replacement costs. The AJ133 5.0-litre variant typically sits at the higher end of the range. See the Era Map above for generation-specific pricing.

Labour estimate: Fitting an XKR engine typically takes 14–18 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer).

Compare XKR engine prices from UK specialists

Common Problems

1. Plastic Timing Chain Tensioner Failure (AJ26S 4.0 - X100 1998–2002 - Critical)

2. Rubber Coolant Valley Pipes (AJ34S 4.2 - X100 2002–2006)

3. Timing Chain Tensioner Failure (AJ133 5.0 - X150 2007–2014 - Critical)

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XKR 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.

XKR 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 tensioners (4.0 - preventative)✅ Yes£800–£2,000Essential maintenance - upgrade to metal tensionersSnapped timing chain (4.0)❌ Usually NoEngine replacementPiston-valve contact means little is left to repairCoolant valley pipes (4.2 - preventative)✅ Yes£600–£1,200Essential maintenance - catch before overheatingTiming chain tensioners (5.0 - preventative)✅ Yes£2,000–£4,000Essential maintenance - catch before catastrophic failureSnapped timing chain (5.0)❌ Usually NoEngine replacementPiston-valve contact means little is left to repairSupercharger coupler wear (all)✅ Yes£200–£600Catch it early - far cheaper than supercharger replacement

Buying This XKR? Check These First

Buy If

4.2-litre X100 (2002–2006) - considered the most reliable XKR engine
4.0-litre X100 with upgraded metal timing chain tensioners
5.0-litre X150 (2013–2014) with revised timing chain components
Full service history with regular oil changes (critical for chain longevity)
No cold-start rattling (timing chain and tensioner health)
Coolant valley pipes recently replaced (4.2)

Avoid If

4.0-litre X100 with no timing chain tensioner history - assume it's overdue
5.0-litre X150 pre-2013 with cold-start rattle and no chain history - budget for timing chain work
No service history - all XKR engines are sensitive to oil quality
Overheating history or unexplained coolant loss - cooling system damage may have occurred
Any XKR with a history of timing chain failure - walk away

Closing Verdict

The XKR is Jaguar's supercharged V8 grand tourer - a 370–510 bhp masterpiece that delivers effortless performance and distinctive style. The engine choice defines the ownership experience. The 4.0-litre AJ26S (1998–2002) is the riskiest - plastic timing chain tensioners can fail catastrophically. The 4.2-litre AJ34S (2002–2006) is widely considered the most reliable - "very robust" with coolant valley pipes as the only real weakness. The 5.0-litre AJ133 (2007–2014) offers the most power (510 bhp) but suffers from timing chain tensioner issues - pre-2013 cars are most at risk, with a class action settlement reached for 2010-2016 vehicles. With typical XKR values ranging from £10,000 (early X100) to £30,000+ (late X150), an engine replacement is a major financial commitment - the 4.2-litre X100 (2002–2006) with documented maintenance is the safest choice for reliability-focused buyers.

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Buying Checklist

Before you buy a used Jaguar XKR (or before you commit to an engine replacement), check these:

Cold Start

Listen for rattling or ticking (timing chain tensioner warning - all engines) - see the map above

Service History

Including which engine era (AJ26S 4.0, AJ34S 4.2 or AJ133 5.0) and oil-change discipline

Timing Chain Tensioners

For 4.0: confirm upgrade to metal tensioners; for 5.0 pre-2013: check for chain work or cold-start rattle

Coolant Level

Check reservoir when cold; any low or loss may indicate valley pipe leaks (4.2) or water pump issues

Coolant Valley Pipes

For 4.2: check for any history of replacement (age-related failure)

Supercharger Health

Listen for rattling at idle (coupler wear) - aftermarket coupler costs around £20

Oil Leaks

Check around valve covers and oil filter housing for leaks

Engine Warning Light

Have codes read; unresolved issues may indicate timing, cooling or sensor problems

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.

AJ26S (4.0 SC V8)

Years1998–2002 (X100)

Power370 bhp @ 6,150rpm

2025 Enquiries- (pattern data)

Avg. Recon Cost£3,500–£6,000 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

AJ26S (4.0 SC V8)1998–2002 (X100)370 bhp @ 6,150rpm- (pattern data)£3,500–£6,000 [PLACEHOLDER]

AJ34S (4.2 SC V8)2002–2006 (X100)390–420 bhp @ 6,250rpm- (pattern data)£4,000–£7,000 [PLACEHOLDER]

AJ133 (5.0 SC V8)2007–2014 (X150)510 bhp @ 6,500rpm- (within AJ133 family volume)£5,500–£12,000 [PLACEHOLDER]

Technical Specs

AJ34S 4.2 SC V8 - X100 generation

Displacement5,000cc

CylindersV8, 90° - aluminium block and head

Bore × Stroke92.5mm × 93.0mm

Compression Ratio9.5:1

Fuel SystemSpray-guided direct injection (SGDI)

SuperchargerEaton TVS R1900 (Roots-type)

Valves32 valves, DOHC

Torque625 Nm @ 2,500–5,500 rpm

Displacement4,196cc

CylindersV8 - cast-iron sleeved aluminium block

SuperchargerEaton M112

Torque399 lb-ft

→ Compare XKR engine prices for your XK

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Market Intelligence

Most Common Failure

Timing chain tensioner issues (4.0 and 5.0)

the defining risk of the XKR

Average Enquiry Mileage

50,000

–80,000 miles

[PATTERN DATA]

Average Replacement Cost

£5,500

–£7,500 reconditioned, supply only

[PLACEHOLDER]

Most Requested Engine Code

AJ133 (5.0 SC) / AJ34S (4.2 SC)

[PATTERN DATA]

Peak Enquiry Season

Winter

cold starts expose timing chain wear

[PATTERN DATA]

Regional Demand

South East18%

North West16%

Midlands14%

PATTERN DATA

Regional Demand Breakdown

18%South East

16%North West

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 condition, 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 XKR Owners Trust JaguarEngine.uk

Trusted XKR Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real XKR owners, as part of the Engine Finders network, across every generation - AJ26S, AJ34S and AJ133 - covering the X100 and X150 chassis.
Compare XKR Engine Replacement Companies
see prices, warranty terms and supply & fit options side-by-side before you commit. We cover the supercharged V8 specifically, with specialists who understand the timing chain tensioner vulnerabilities, coolant pipe issues, and the unique requirements of the XKR.
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supply-only or full supply & fit available nationwide, covering every generation of this badge since 1998, with a 12-month warranty as standard across our network.

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12-Month Warranty

As standard

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