Jaguar XKRS Engine Replacement - Compare Prices & Get Quotes
Get quotes today from trusted UK Jaguar XKR-S engine specialists. Compare prices on reconditioned, rebuilt and used engines to find the most cost-effective supply and fit solution for your high-performance grand tourer.
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12-Month Warranty
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From £5,900 to £8,500
Used from £3,500 · Reconditioned from £5,500 · Common codes: AJ34S, AJ133
From £3,500
Tested, bare/short engine
From £5,500
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
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3 Simple Steps3 Simple Stepsto Finding the Best Jaguar XKR-S Replacement Engineto Finding the Best Jaguar XKR-S Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryJaguar XKR-S - Engine History & Specs at a Glance
When the Jaguar XKR-S launched, it served as the limited-run, track-focused pinnacle of the X150 generation, featuring significantly upgraded cooling, suspension, and supercharger components over the standard XKR to handle extreme performance demands.
Variant HistoryJaguar XKR-S - Engine History & Specs at a Glance
When the Jaguar XKR-S launched, it served as the limited-run, track-focused pinnacle of the X150 generation, featuring significantly upgraded cooling, suspension, and supercharger components over the standard XKR to handle extreme performance demands.
Jaguar XKR-S
Fuel TypePetrol
Engine Size Range4.2L - 5.0L
Power Output Range420-550hpEngine History Timeline
XKR-S 4.2 introduced. AJ34S 4.2L supercharged V8 420hp. Limited production run (e.g., 200 UK coupes) with identical power output to the standard XKR but distinct aerodynamic and chassis tuning.
XKR-S 5.0 launched. AJ133 5.0L supercharged Gen III V8 550hp. Featured revised ECU mapping, upgraded supercharger cooling, and a significant power increase over the previous generation.
XKR-S GT 5.0 introduced as the ultimate ultra-limited variant, retaining the 550hp AJ133 engine but with further track-focused aerodynamic and chassis refinements.
Key Specs Snapshot
Fuel TypePetrolEngine Size Range4.2L - 5.0LPower Output Range420-550hpYears Produced2008-2009 (4.2L), 2011-2014 (5.0L)Every engine fitted to the Jaguar XKR-S is covered below, with UK rebuilt pricing and known failure points specific to these high-performance variants.
Jaguar XKR-S Engine Codes - Specifications & Replacement CostJaguar XKR-S Engine Codes - Specifications & Replacement Cost
4.2L Supercharged Petrol (2008-2009)
Power Output420hpYears Fitted2008-2009
Compatible Trim Levels
- XKR-S 4.2 Coupe
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£3,500-£5,000 [EM-QUOTE]
Reconditioned
Addressed known issues, tested
£5,500-£7,500 [EM-QUOTE]
Rebuilt
Full teardown, upgraded internals
£5,900-£7,900 [EM-QUOTE]
Common Failure
Supercharger coupler wear causing progressive boost loss and rattling, alongside timing chain tensioner degradation typical of the 4.2L AJ-V8 family.
The Jaguar XKR-S reliability profile is heavily influenced by the inherent stresses of its supercharged AJ-V8 architecture. Supercharger coupler degradation, timing chain tensioner wear, and (on the 5.0L) oil pump drive failure are the most frequently reported issues. Every rebuilt Jaguar XKR-S engine supplied through EnginesMarket includes upgraded internal components specifically designed to address these original factory failure points, backed by a minimum 12-month unlimited mileage warranty.
Why the Jaguar XKR-S Loses Boost
Affected Vehicles
Jaguar XKR-S (AJ34S 4.2L & AJ133 5.0L, 2008-2014)
Typical Failure Mileage
40,000-70,000 miles
Root Cause
The Eaton supercharger uses a nylon/plastic coupler between the snout shaft and rotor pack. Heat cycling and torsional stress cause the coupler to wear down, creating a rattle at idle and progressive boost loss.
Why It Happens
The Eaton supercharger uses a nylon/plastic coupler between the snout shaft and rotor pack. Heat cycling and torsional stress cause the coupler to wear down, creating a rattle at idle and progressive boost loss.
Dealer (parts + labour)
£9,000-£13,000
Specialist (parts + labour)
£6,500-£8,500
What it involves
Supply & fit of rebuilt engine including fully serviced supercharger with upgraded coupler, new timing components, bench tested
Suitability
100k+ miles. The only option if coupler failure caused debris ingestion or secondary engine damage.
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 |
|---|---|---|---|---|---|
 Full Replacement - rebuilt engine Minor | £9,000-£13,000 | £6,500-£8,500 | Supply & fit of rebuilt engine including fully serviced supercharger with upgraded coupler, new timing components, bench tested | 100k+ miles. The only option if coupler failure caused debris ingestion or secondary engine damage. | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical Jaguar XKR-S of relevant age is worth £15,000-£45,000+. In this value band, a reconditioned or rebuilt engine at £5,900-£8,500 usually justifies the premium via warranty and reliability, protecting the vehicle's significant residual value.
Our Recommendation
Our Recommendation
Replace the coupler the moment you hear rattling from the front of the supercharger. At specialist prices (£800-£1,200), it is preventative maintenance that protects a £2,000+ supercharger. If you have already lost boost or hear grinding, opt for the full supercharger rebuild. XKR-S owners who ignore the rattle often face engine replacement when coupler debris circulates.
Don't Let Engine Failure Write Off Your Jaguar XKR-S
Supercharger coupler wear, timing chain failure, and oil pump collapse are the three biggest threats to your XKR-S's AJ-V8. But none of them need to end your ownership. EnginesMarket connects you with UK Jaguar specialists who supply rebuilt engines with upgraded components - addressing every factory weakness at source. All units carry a 12-month unlimited mileage warranty, nationwide delivery is available, and supply & fit options remove the hassle. Compare prices today and get your XKR-S back on the road without the main dealer premium.
Get quotes for XKR-S supercharged engine replacement with upgraded couplers
12-Month Minimum
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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 XKR-S and engine code. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier.
Jaguar XKR-S Engine ReplacementFrequently Asked Questions
Question 1How much does a Jaguar XKR-S engine replacement cost in the UK-
A rebuilt Jaguar XKR-S engine typically costs between £5,900 and £8,500 for supply only, depending on whether it is the 4.2L (AJ34S) or 5.0L (AJ133) variant. Supply and fit packages generally add £1,500-£2,200 for specialist labour, supercharger servicing, and mandatory JLR diagnostic coding.
- 4.2L XKR-S rebuilt supply-only: £5,900-£7,900
- 5.0L XKR-S rebuilt supply-only: £6,500-£8,500
- Specialist labour & coding: £1,500-£2,200
Question 2What are the common signs my Jaguar XKR-S engine is failing-
Rattle on startup points to timing chain tensioner failure. A distinct rattling noise from the front of the engine that changes with revs suggests supercharger coupler wear. Sudden loss of oil pressure or a knocking sound means bottom end bearing failure or oil pump drive failure - stop driving immediately.
- Rattle on cold start (1-2 seconds) = timing chain tensioners failing
- Rattling from engine front with boost loss = supercharger coupler wear
- Persistent knocking or oil pressure warning = rod/main bearing or oil pump failure
Question 3Is the 4.2L or 5.0L XKR-S engine more reliable-
Both share similar vulnerabilities regarding supercharger coupler wear and timing chain tensioner degradation. However, the 5.0L Gen III (AJ133) carries the additional risk of oil pump drive failure (Recall JAG-19V-005). Neither is inherently "unreliable" if preventative maintenance is strictly followed, but the 5.0L requires more vigilant monitoring of its oil pump and cooling systems.
- Both require upgraded timing chain tensioners as preventative maintenance
- 5.0L requires verification of JAG-19V-005 oil pump recall completion
- Regular oil changes every 5,000-7,000 miles are critical for both variants
Question 4Does a replacement Jaguar XKR-S engine need ECU coding-
Yes, this is non-negotiable. All AJ-V8 engines require JLR SDD or Pathfinder diagnostic tool programming to synchronise the immobiliser, recognise the new engine's parameters, and calibrate the supercharger and VVT systems. Specialist fitting services always include this.
- Immobiliser and security system synchronisation required
- Only JLR-certified diagnostic tools can perform the coding
- DIY fitting without coding will prevent the car from starting
Question 5Can I fit a 5.0L XKR-S engine into my standard 4.2L XKR or XK-
Not a direct swap. You would need the XKR-S ECU, complete engine harness, upgraded cooling system (including intercooler pumps), transmission modifications, and different engine mounts and differential. It is prohibitively expensive and complex.
- Different ECU mapping and engine harness architecture
- Cooling system requires significant upgrades for supercharger heat rejection
- Transmission and differential ratios differ between standard and XKR-S models
- Most specialists recommend selling your standard XK and buying an XKR-S instead
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