Jaguar XJ 5.0 V8 Engine ReplacementCompare Prices & Get Quotes
Get quotes today from trusted UK Jaguar XJ 5.0 V8 engine specialists. Compare prices on reconditioned, rebuilt and used engines for the 5.0L AJ133 V8, ensuring precision engineering and reliable performance for your flagship executive saloon.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
From £8,000 to £12,000 [EM-QUOTE]
Used from £3,000 · Reconditioned from £5,500 · Common codes: AJ133, AJ133SC, 508PN
From £3,000
Tested, bare/short engine
From £5,500
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
Secure enquiry - no spam, no pressure. Genuine quotes only from vetted UK Jaguar XJ 5.0 V8 specialists.
3 Simple Steps3 Simple Stepsto Finding the Best Jaguar XJ 5.0 V8 Replacement Engineto Finding the Best Jaguar XJ 5.0 V8 Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryJaguar XJ 5.0 V8 - Engine History & Specs at a Glance
When the 5.0 V8 launched in the XJ range for the 2010 model year (X351 generation), it replaced the previous 4.2L unit, delivering 385hp naturally aspirated and up to 550hp supercharged in XJR and Supersport trims. Throughout its production run, the engine architecture remained consistent, though critical timing and cooling components received factory revisions.
Variant HistoryJaguar XJ 5.0 V8 - Engine History & Specs at a Glance
When the 5.0 V8 launched in the XJ range for the 2010 model year (X351 generation), it replaced the previous 4.2L unit, delivering 385hp naturally aspirated and up to 550hp supercharged in XJR and Supersport trims. Throughout its production run, the engine architecture remained consistent, though critical timing and cooling components received factory revisions.
Jaguar XJ 5.0 V8
Fuel TypePetrol
Engine Size Range5.0L
Power Output Range385-550hpEngine History Timeline
AJ133 / 508PN 5.0L V8 Naturally Aspirated, 385hp, launched in the X351 generation.
AJ133SC 5.0L V8 Supercharged, 470-510hp, introduced for XJR and Supersport variants.
Revised timing chain guides and tensioners implemented to address early wear patterns.
Final production year for the Jaguar XJ 5.0 V8 concluding the X351 generation.
Key Specs Snapshot
Fuel TypePetrolEngine Size Range5.0LPower Output Range385-550hpYears Produced2010-2019Every engine fitted to the Jaguar XJ 5.0 V8 is covered below, with UK rebuilt pricing and known failure points for this flagship V8 powertrain.
Jaguar XJ 5.0 V8 Engine Codes - Specifications & Replacement CostJaguar XJ 5.0 V8 Engine Codes - Specifications & Replacement Cost
5.0L Petrol Naturally Aspirated (2010-2019)
Power Output385hpYears Fitted2010-2019
Compatible Trim Levels
- XJ 5.0 V8
- XJ Portfolio 5.0
- XJ Sovereign 5.0
- XJ Autobiography 5.0
- XJ LWB 5.0
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£3,000-£5,500
Reconditioned
Addressed known issues, tested
£5,500-£9,000
Rebuilt
Full teardown, upgraded internals
£8,000-£12,000
Common Failure
Timing chain tensioner wear (primarily 2010-2012 models) and plastic coolant crossover pipe degradation, typically presenting between 60,000 and 100,000 miles.
The Jaguar XJ 5.0 V8 reliability profile is defined by the well-documented vulnerabilities of the AJ133 family, particularly around timing chain tensioners and cooling system components. Every rebuilt engine supplied through EnginesMarket includes upgraded internal components designed to permanently address these original failure points, backed by a minimum 12-month unlimited mileage warranty.
Why the Jaguar XJ 5.0 V8 AJ133 Wears Prematurely
Affected Vehicles
Jaguar XJ 5.0 V8 (AJ133, AJ133SC, 2010-2012)
Typical Failure Mileage
60,000-100,000 miles
Root Cause
Original hydraulic tensioners lose pressure and plastic guide rails wear under heat cycles, allowing chain slack that leads to rattling on cold starts and potential timing jumps or valve collision.
Why It Happens
Original hydraulic tensioners lose pressure and plastic guide rails wear under heat cycles, allowing chain slack that leads to rattling on cold starts and potential timing jumps or valve collision.
Dealer (parts + labour)
£2,500-£3,500
Specialist (parts + labour)
£1,500-£2,200
What it involves
Full removal of front covers, installation of upgraded metal guides and reinforced tensioners
Suitability
Viable only if caught at first cold-start rattle before engine runs rough
1 - 2 daysDealer (parts + labour)
£14,000-£18,000
Specialist (parts + labour)
£8,000-£12,000 [EM-QUOTE]
What it involves
Supply & fit of fully rebuilt unit with revised timing architecture, bench-tested with 12-month warranty
Suitability
Only reliable solution once metallic grinding or CEL appears; prevents recurrence
1 - 2 daysAll prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 Minor - Preventative Chain Kit Replacement Minor | £2,500-£3,500 | £1,500-£2,200 | Full removal of front covers, installation of upgraded metal guides and reinforced tensioners | Viable only if caught at first cold-start rattle before engine runs rough | 1 - 2 days |
 Full Replacement - rebuilt/reconditioned engine Best Value | £14,000-£18,000 | £8,000-£12,000 [EM-QUOTE] | Supply & fit of fully rebuilt unit with revised timing architecture, bench-tested with 12-month warranty | Only reliable solution once metallic grinding or CEL appears; prevents recurrence | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical 2010-2015 Jaguar XJ 5.0 V8 holds a UK market value of approximately £8,000-£18,000 [THIRD-PARTY]. A specialist rebuilt engine (£8,000-£12,000) represents a viable fraction of the vehicle's total value, making replacement highly financially viable and the recommended path to preserve the car's flagship status.
Our Recommendation
Our Recommendation
If you hear a brief diesel-like rattle only on cold starts, replace the chain kit immediately with upgraded metal guides. Once the rattling persists under load, internal damage is already done. A rebuilt AJ133 with factory-corrected tensioners is the most cost-effective path forward.
Don't Let Engine Failure Write Off Your Jaguar XJ 5.0 V8
Whether your Jaguar XJ 5.0 V8 is struggling with timing chain stretch or cooling system degradation, the financial decision between repeated dealership repairs and a complete engine replacement is straightforward. EnginesMarket connects you with trusted UK Jaguar specialists who supply fully rebuilt 5.0L V8 engines featuring upgraded internal components that permanently address the original design vulnerabilities. Every unit comes with a minimum 12-month unlimited mileage warranty, nationwide delivery, and optional supply & fit packages, allowing you to bypass main dealer markups and return to the road with confidence.
Compare rebuilt AJ133 Jaguar XJ 5.0 V8 engine prices
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific Jaguar XJ 5.0 V8. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier.
Jaguar XJ 5.0 V8 Engine ReplacementFrequently Asked Questions
Question 1How much does a Jaguar XJ 5.0 V8 engine replacement cost-
A fully rebuilt Jaguar XJ 5.0 V8 engine typically costs between £8,000 and £12,000 for supply only, while reconditioned units start from £5,500. Used verified donor units are available from £3,000.
- Rebuilt AJ133 units include upgraded timing components and 12-month warranty.
- Specialist supply and fit labour typically adds £910-£1,170.
- Main dealer quotes frequently exceed £14,000, making specialist replacement highly cost-effective.
Question 2What are the signs of timing chain failure in a Jaguar XJ 5.0 V8-
Early signs of timing chain wear in the AJ133 5.0L V8 include a distinct metallic rattling or knocking noise from the front of the engine, especially during cold starts.
- Metallic rattling on startup indicates advanced tensioner wear.
- Sudden loss of power or check engine lights with cam timing codes.
- Ignoring these symptoms can lead to catastrophic internal engine seizure.
Question 3Is it worth replacing the engine in a Jaguar XJ 5.0 V8-
Yes, replacing the engine is typically worthwhile given the car's retained value. A rebuilt unit costs £8,000-£12,000 versus £14,000+ dealer quotes, preserving a flagship saloon worth £8,000-£25,000.
- XJ 5.0 V8 values remain strong; well-maintained examples retain significant worth post-repair.
- Specialist rebuilt engines include upgraded components addressing original OEM failure points.
- Minimum 12-month unlimited mileage warranty provides financial protection post-replacement.
Question 4What is the difference between the AJ133 and AJ133SC engines-
The AJ133 is the 5.0L naturally aspirated V8 producing 385hp, while the AJ133SC is the supercharged variant producing 470-550hp for XJR and Supersport trims. Both share the same core block and timing vulnerabilities.
- AJ133SC requires additional supercharger coupler and isolator monitoring.
- Rebuilt pricing reflects V8 complexity and supercharged premium.
- Both engines benefit from upgraded metal timing guides during specialist rebuilds.
Question 5How long does a Jaguar XJ 5.0 V8 engine replacement take-
A complete Jaguar XJ 5.0 V8 engine replacement typically requires 3-5 working days for specialist supply & fit, including removal, calibration, coolant bleed, and road testing.
- Complex aluminium architecture and supercharger access extend labour time versus mainstream models.
- ECU adaptation requires Jaguar-specific diagnostic equipment post-fit.
- Nationwide specialist network enables local fitting without main dealer appointment delays.
Question 6What warranty comes with a reconditioned Jaguar XJ 5.0 V8 engine-
All reconditioned and rebuilt Jaguar XJ 5.0 V8 engines supplied through EnginesMarket include a minimum 12-month unlimited mileage warranty covering parts and labour for manufacturing defects.
- Warranty applies to both parts and labour when using a network specialist.
- Upgraded internal components (like revised timing chains) are specifically covered.
- Keep all service records and invoices to maintain warranty validity.
Why Choose UsCompare Jaguar XJ 5.0 V8Engine PricesToday
100+ Jaguar XJ 5.0 V8 engines supplied through our network
12-Month Unlimited Mileage Warranty on every rebuilt Jaguar XJ 5.0 V8 engine
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expert supply & fit available for flagship saloon variants
Comparing quotes is free, no-obligation, and specific to your exact Jaguar XJ 5.0 V8 and engine code. Don't risk your premium executive saloon with unverified parts; connect with vetted UK specialists who understand the unique demands of the 5.0L AJ133 V8 and can get you back on the road with complete peace of mind.
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