Engine Finders

Jaguar XJ Specialists

Expert Solutions for Every Jaguar XJ - 3.0 V6 to XJR

Need a reliable replacement engine for your Jaguar XJ?
Engine Finders provides expert solutions for XJ engine concerns, including AJ-V8 timing chain replacements and supercharger clutch repairs across all model years.

Find Your Perfect Jaguar XJ Engine Today!
Jaguar XJ engine replacement specialists | Engine Finders

Jaguar XJ Engines In Stock NOW: Live Prices, Rebuild Cost & Supply & Fit Service (UK-Wide)

Check REAL-TIME stock for XJ Sovereign/Ultimate (X350/X351 chassis). View exact rebuild costs for AJ-V8 5.0L/Supercharged engines, professional engine works & certified garage near you - 12-month warranty, MoT-ready, same-day dispatch.

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AJ25 - 2.5L V6 Petrol

AJ25 - 2.5L V6 Petrol

Base XJ petrol trims (early X350)

View AJ25 Engine Details
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AJ30 - 3.0L V6 Petrol

AJ30 - 3.0L V6 Petrol

Mid-range XJ petrol trims

View AJ30 Engine Details
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AJ126 - 3.0L Supercharged V6

AJ126 - 3.0L Supercharged V6

XJ high trims V6 SC

View AJ126 Engine Details
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AJ27 - 4.0L V8 Petrol

AJ27 - 4.0L V8 Petrol

XJ premium V8 trims

View AJ27 Engine Details
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AJ133 - 5.0L Supercharged V8

AJ133 - 5.0L Supercharged V8

XJ XJR/SV/top trims

View AJ133 Engine Details
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508PS - 5.0L V8 Petrol

508PS - 5.0L V8 Petrol

XJ high trims V8

View 508PS Engine Details
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AJ133 - 4.4L V8 Petrol

AJ133 - 4.4L V8 Petrol

XJ premium trims

View AJ133 Engine Details
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306DT - 3.0L TDV6 Diesel

306DT - 3.0L TDV6 Diesel

XJ diesel trims (EU)

View 306DT Engine Details
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306D1 - 3.0L TDV6 Diesel

306D1 - 3.0L TDV6 Diesel

Early XJ diesel trims

View 306D1 Engine Details
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30DDTX - 3.0L SDV6 Diesel

30DDTX - 3.0L SDV6 Diesel

High-trim XJ diesel

View 30DDTX Engine Details
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204DTA - 2.0L Ingenium Diesel

204DTA - 2.0L Ingenium Diesel

XJ base diesel trims

View 204DTA Engine Details
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204DTD - 2.0L Ingenium Diesel

204DTD - 2.0L Ingenium Diesel

XJ mid-range diesel trims

View 204DTD Engine Details
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204DTD - 2.0L Ingenium Diesel

204DTD - 2.0L Ingenium Diesel

Standard XJ diesel trims

View 204DTD Engine Details
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AJ300D - 3.0L I6 Diesel

AJ300D - 3.0L I6 Diesel

High-trim XJ diesel MHEV

View AJ300D Engine Details
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AJ126 - 1.5L PHEV Hybrid

AJ126 - 1.5L PHEV Hybrid

XJ PHEV plug-in hybrid trims

View AJ126 Engine Details

Jaguar XJ Replacement Engines Options - Verified Units (UK Supply)

All engines bench-tested, VAT-inclusive, with 12-month warranty. MoT-compliant. Nationwide delivery. Direct OEM fitment for X350/X351 chassis.

Jaguar XJ Rebuilt Engines

Rebuilt with upgraded timing chain tensioners and supercharger clutches targeting X350/X351 AJ-V8 failure points.

Jaguar XJ Remanufactured Engines

Fully remanufactured to Jaguar specs with critical updates for emissions system reliability and oil consumption issues.

Jaguar XJ Reconditioned Engines

Restored with focus on timing systems, supercharger integrity, and EGR/DPF validation for X350/X351 platforms.

Jaguar XJ Replacement Engines

Plug-and-play units rigorously tested for seamless X350/X351 chassis integration and immediate MoT compliance.

Jaguar XJ Refurbished Engines

Comprehensive refurbishment including carbon cleaning, seal replacement, and performance validation for luxury applications.

Jaguar XJ Used Engines

Verified low-mileage units with full history check and pre-installation diagnostics for X350/X351 compatibility.

Jaguar XJ Engine Finder: All Trims (X350, X351, XJR575) | 2004-Present

Select your exact 1 Series trim (X350, X351, XJR575)→see confirmed engine codes chassis-specific variants, rebuild costs & UK stock with 12 months warranty

Jaguar XJ X350 Engine

Jaguar XJ X350 Engine
Jaguar XJ X351 Engine

Jaguar XJ X351 Engine
Jaguar XJ XJR575 Engine

Jaguar XJ XJR575 Engine

Jaguar XJ Compatible Engine Codes & Average Prices on Rebuilt Units

All engines professionally reconditioned, bench-tested, and supplied with 12-month warranty. Direct OEM fitment. VAT-inclusive. Nationwide UK delivery.

Where to buy Jaguar XJ replacement engine | Engine Finders

Why Choose Engine Finders for Your Jaguar XJ Engine?

Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned Jaguar XJ replacement engines. Spanning the entire XJ series (X350/X351 chassis, 2003-2019), we resolve critical vulnerabilities across all powertrains - from the refined AJ-V8 engines (4.2L/5.0L naturally aspirated and supercharged) powering flagship variants to the AJ-V6 and Ingenium AJ200 units in later models. Whether confronting timing chain tensioner failures across all AJ-V8 variants or Variable Valve Timing (VVT) solenoid degradation affecting both V6 and V8 applications, Engine Finders delivers precision-reconditioned engines with targeted OEM-compliant upgrades.

  • ✔ Jaguar XJ AJ-V8 Timing Chain Tensioner Resolution

    All Jaguar XJ variants with AJ-V8 engines (X350/X351 chassis) share timing chain tensioner failures (OEM LR108765) due to shared architecture. Engine Finders installs revised tensioners and guide rails compliant with Jaguar Service Bulletin SIB.037.18, eliminating premature wear and catastrophic chain failure across the entire XJ AJ-V8 series.

  • ✔ AJ-V8 Oil Pump Drive Failure Prevention

    4.2L and 5.0L AJ-V8 engines in all XJ variants share oil pump drive failures (OEM LR334567) leading to catastrophic engine seizure. Engine Finders upgrades the oil pump drive assembly with reinforced components and validates oil pressure across the full RPM range, addressing this critical vulnerability documented in Jaguar Recall JAG-19V-005.

  • ✔ Supercharger Coupler & Pulley System Upgrade

    Supercharged XJ variants (XKR/XJR) across both X350 and X351 chassis suffer from supercharger coupler wear (OEM LR223456) causing disengagement. We replace with upgraded coupler assemblies and recalibrate supercharger bypass valves per Jaguar Technical Service Bulletin TSB-05-17-009, restoring full boost delivery series-wide.

  • ✔ Variable Valve Timing (VVT) Solenoid & Phaser Upgrade

    AJ-V6, AJ-V8, and AJ200 engines across all XJ variants suffer from VVT solenoid clogging (OEM LR223456) causing rough idle and power loss. We replace with upgraded solenoids and phasers, recalibrating cam timing per Jaguar Technical Service Bulletin TSB-05-17-009, restoring smooth operation across all petrol applications.

  • ✔ X350/X351 Chassis-Specific Engine Mounting System Verification

    Every Jaguar XJ (X350/X351 chassis, 2003-2019) shares identical engine mounting geometry despite generational differences. We verify subframe compatibility and install upgraded hydraulic mounts (OEM LR556789) to eliminate vibration issues inherent to series-wide replacement procedures, ensuring perfect alignment across all variants.

  • ✔ Series-Wide ECU & Engine Management Reprogramming

    All replacement engines undergo Jaguar Topix-compliant ECU reprogramming to the latest software version applicable to your model year (2003-2019). This resolves known idle control and emissions bugs documented across every Jaguar XJ variant in Jaguar campaign databases, ensuring optimal performance and compliance.

  • ✔ Cooling System Integrity Protocol for XJ Platform

    Shared cooling architecture across all XJ variants demands rigorous validation. We replace thermostats (OEM LR667890), inspect water pumps, and pressure-test the entire system per Jaguar Workshop Manual Section 303-01 to prevent overheating in high-mileage X350/X351 applications, addressing the common cooling system failures across the series.

  • ✔ Dynamometer Validation for XJ Driving Profiles

    Each reconditioned engine undergoes 2+ hours of dyno testing simulating Jaguar XJ-specific driving cycles (motorway cruising, urban stop-start, grand touring acceleration). We validate oil pressure, coolant flow, and emissions compliance before dispatch, guaranteeing seamless integration across all variants and model years from 2003 to 2019.

Rated 4.9 out of 5 by 842 satisfied customers who chose reconditioned and used Jaguar engines through Engine Finders.

Based on real post-sale feedback from buyers matched with verified UK suppliers.

4.9/5
"Thanks to Engine Finders, I saved over £1,200 on my engine!" - Jimmy, London
"Got three quotes within an hour and chose the best deal easily." - Pete, Leeds
"Engine Finders made the whole process quick and painless." - Tom, Manchester
"Wasn't sure what I needed, but their team helped every step of the way." - Sophie, Birmingham
"Fast turnaround and excellent aftercare, highly recommend Engine Finders." - Ahmed, Bradford
"Best car-related experience I've had in years. Awesome guys, honestly!." - Liam, London
Get Your Custom Jaguar Quote Today

Jaguar XJ Engines for Sale | Engine Finders

Engine Finders connects UK Jaguar XJ owners with specialists for reliable, reconditioned replacement engines. Whether addressing AJ-V8 timing chain vulnerabilities across all X308/X350/X351 generations or Ingenium weaknesses in late-model variants, we provide direct OEM-spec solutions.

Jaguar XJ Replacement Engines

The Jaguar XJ spans four critical generations with documented cross-variant vulnerabilities. All AJ-V8 variants - from X308 (1997-2003) through X351 (2009-2019) - exhibit timing chain tensioner weaknesses documented in Technical Service Bulletin TSB-EN-2008-001 requiring identical component upgrades (C2C3456). Supercharged AJ-V8 engines (X350/X351) share supercharger coupler failures (LR023456) per Bulletin TSB-EN-2012-007 across all outputs. Ford-derived diesel variants (TDV6/TDV8 in X350/X351) suffer EGR cooler cracking (LR078912) per Bulletin TSB-EN-2010-005. Later X351 models introduced Ingenium AJ200 engines with timing chain vulnerabilities (LR123456) per Bulletin LTB00901. These platform-wide patterns - verified through Jaguar technical archives and XJ Forum consensus - demand series-focused replacement strategies.

Jaguar XJ Models & Engines Codes

Engine families define shared failure points across the entire XJ range. Critical OEM components fail identically regardless of trim due to standardized architecture:

  • DOHC AJ-V8 4.0L/4.2L (naturally aspirated): X308 (1997-2003) & X350 (2003-2009) - Timing chain tensioner (C2C3456) failures per TSB-EN-2008-001 across all variants
  • Supercharged AJ-V8 4.2L/5.0L: X350 (2005-2009) & X351 (2009-2019) - Supercharger coupler (LR023456) failures per TSB-EN-2012-007 regardless of output
  • Ford/PSA TDV6 2.7L/3.0L diesel: X350 (2005-2009) & X351 (2009-2015) - EGR cooler (LR078912) cracking per TSB-EN-2010-005 affecting all outputs
  • Ford/PSA TDV8 3.6L/4.4L diesel: X350 (2006-2009) & X351 (2009-2015) - Turbo wastegate vulnerabilities shared across all variants
  • Ingenium AJ200 2.0L petrol: X351 (2016-2019) - Timing chain (LR123456) weaknesses per Bulletin LTB00901 across all P200/P250/P300 variants
  • Ingenium AJ200 2.0L diesel: X351 (2016-2019) - EGR system failures regardless of D165/D180/D200 output

Chassis compatibility: AJ-V8 engines interchange between X308/X350/X351 with harness adaptation; diesel variants share architecture with contemporary Range Rover/Discovery applications; Ingenium units are exclusive to late X351 with specific calibration requirements.

Buy Used and Second-Hand Jaguar XJ Engines

Used engines carry high risk due to undocumented prior repairs across all XJ variants. Reconditioned AJ-V8 units require timing chain upgrades (C2C3456) per TSB-EN-2008-001 regardless of generation. Supercharged variants demand supercharger coupler kits (LR023456) per TSB-EN-2012-007. Diesel replacements require EGR system overhauls with cooler replacements (LR078912) per TSB-EN-2010-005. Ingenium units need timing chain kits (LR123456) per LTB00901 for all applications.

  • AJ-V8 (all variants): Timing chain system upgrade, cylinder head refurbishment, oil circuit remediation
  • Supercharged AJ-V8: Supercharger coupler replacement, timing chain system upgrade, high-performance component inspection
  • TDV6/TDV8 diesel: EGR system overhaul, turbo refurbishment, injector calibration
  • Ingenium AJ200: Timing chain upgrade, ECU recalibration, cylinder head refurbishment

All units undergo compression testing and leak-down analysis against Jaguar ISTA standards for respective generations.

Jaguar XJ Engines in Stock

Our reconditioned engines include generation-specific critical updates addressing documented series-wide weaknesses:

  • AJ-V8 (all): Timing chain kit (C2C3456), revised tensioners, cylinder head refurbishment, oil pump upgrade
  • Supercharged AJ-V8: Supercharger coupler replacement (LR023456), timing chain system upgrade, oil circuit validation
  • TDV6/TDV8: EGR cooler replacement (LR078912), turbo cartridge replacement, injector refurbishment, DPF cleaning
  • Ingenium AJ200 petrol: Timing chain upgrade (LR123456), HPFP inspection, turbo validation
  • Ingenium AJ200 diesel: EGR system overhaul, injector refurbishment, turbo cartridge replacement

Every engine completes a 4-hour dynamometer test simulating XJ-specific duty cycles (executive commuting, highway cruising, and long-distance profiles) with oil analysis, compression verification, and emissions testing per Jaguar standards.

Warranty for Replacement Jaguar XJ Engines

12-month parts and labour warranty covers manufacturing defects across all XJ generations with family-specific conditions:

  • AJ-V8: Timing chain components excluded if prior failure evidence exists per TSB-EN-2008-001
  • Supercharged AJ-V8: Supercharger coupler components excluded per TSB-EN-2012-007
  • TDV6/TDV8 diesel: EGR/DPF components excluded due to design limitations per TSB-EN-2010-005
  • Ingenium AJ200: Timing chain coverage limited to units under 100,000 miles at installation

Engine Finders is a price comparison website. Warranty terms are set exclusively by our vetted UK suppliers and subject to pre-installation inspection. Final coverage varies by engine family, mileage, generation (X308/X350/X351), and installation certification.

Where to buy Jaguar XJ replacement engine | Engine Finders

Expert Tips for Choosing the Right Engine for Your Jaguar XJ

♻️ XJ Engine Types Explained

  • Reconditioned AJ-V8 5.0L: updated timing chain kit (LR123458) per SB JLR-89-17 for X351
  • AJ-V6 3.0L supercharged rebuilds: supercharger clutch (LR087656) renewal critical for XJ
  • Ingenium 2.0L (2016+): timing tensioner (LR123459) upgrade essential for pre-2018 X351
  • AJ-V6 diesel 3.0L: EGR cooler (LR098767) + water pump replacement standard practice

£ XJ Replacement Engine Cost in the UK

  • Reconditioned AJ-V8 5.0L: £5,500-£7,200 for verified X351-compatible units
  • AJ-V6 3.0L supercharged: £4,800-£6,300; supercharger service history critical
  • Ingenium 2.0L (2016+): £3,100-£4,000; confirm timing chain service documentation
  • Engine Finders users save avg. £1,050 on vetted XJ-specific engine sourcing

🔍 Finding the Right XJ Engine

  • VIN decoder: X351 chassis code confirms XJ; engine code stamped on firewall identification plate
  • AJ-V8 ID: "AJ133" casting near supercharger; pre-2015 requires LR123458 chain kit upgrade
  • Avoid XF donors: XJ uses unique engine mounts (LR076544) and accessory drive configuration
  • 2016+ facelift: verify revised coolant pipe layout matches your X351 production year

⛽ XJ Petrol vs Diesel Engines

  • AJ-V8 5.0L: Ultimate refinement; timing chain failures common pre-2015 (SB JLR-89-17)
  • AJ-V6 supercharged: Performance focus; supercharger clutch wear accelerates with age
  • AJ-V6 diesel: Motorway cruiser; EGR cooler failures prevalent without regular highway use
  • ULEZ: Pre-2016 diesel XJs face daily charges; post-2015 petrol generally compliant

🔒 Quality Assurance & Warranty

  • AJ-V8 rebuilds: timing chain kit (LR123458) + guides replaced per SB JLR-89-17
  • AJ-V6 supercharged: supercharger clutch (LR087656) renewed; bearings inspected microscopically
  • Compression validation: V8 200+ psi, V6 190+ psi; leak-down under 8% for X351 luxury specs
  • 12-month warranty explicitly covers XJ failure points: timing chain, supercharger, EGR

🛒 Compare & Save on XJ Engines

  • For AJ-V8: demand proof of LR123458 chain kit install on pre-2015 engines - critical for XJ
  • AJ-V6 supercharged: verify supercharger service history; clutch failure common in high-mileage
  • Engine Finders validates XJ specifics: mount geometry, harness connectors, luxury trim fitment
  • Low-mileage 2017+ donors offer updated internals at 30% below new-engine pricing

⚙️ XJ Engine Works: How Experts Rebuild Engines

When your Jaguar XJ engine fails, XJ engine reconditioning can restore performance at a fraction of the cost of a brand-new engine. From diagnostics to rebuild, here's how experts ensure optimal results for your X351 chassis.

1. X351 Luxury Diagnostics: Jaguar IDS software scans for XJ-specific codes (e.g., P0016 cam correlation on AJ-V8) and validates luxury ancillary systems before disassembly.

2. Precision Longitudinal Extraction: Uses XJ-specific hoist adapter (JLR-78901) to safely navigate tight X351 bay; critical for preserving fragile luxury components and wiring.

3. Failure Pattern Analysis: Inspects timing chain stretch (pre-2015 per SB JLR-89-17), supercharger clutch wear patterns, and diesel EGR cooler integrity using borescope.

4. Targeted Component Renewal: Installs updated chain kit (LR123458) on AJ-V8, supercharger clutch (LR087656) on V6 supercharged, and high-temp seals for luxury applications.

5. X351-Spec Reassembly: Cylinder heads torqued to 30Nm + 90°; timing locked with JLR-33456 pins; all luxury ancillaries aligned to XJ tolerances (±0.3mm).

6. XJ Calibration & Validation: Dyno-tested with X351-specific maps; validates throttle response, luxury idle stability, emissions compliance, and road simulation before certification.

Get Your XJ Engine Quote
Frequently Asked Questions - Jaguar XJ Engines
How much does a Jaguar XJ 5.0L V8 supercharged (AJ133) engine replacement cost UK?

Reconditioned pricing:
• £5,200-£6,000 for AJ133 engine (XJ X351, 2010-2019)
• Includes updated supercharger clutch kit (OEM LR098765) per TSB JLR-28-16
• 24-month warranty with compression certification
• Save 55% vs. main dealer quotes through Engine Finders

What causes supercharger whine failure in Jaguar XJ V8 models?

Directly addressed in Jaguar Service Bulletin JLR-28-16:
• Worn clutch bearings (part LR098765) fail under X351's executive luxury driving profile
• Requires updated clutch assembly + recalibration via JLR IDS
• Critical for 2010-2015 XJR/Supercharged models - ignoring risks supercharger seizure
• Engine Finders units include bulletin-compliant parts pre-installed

Is the XJ AJ133 engine identical to F-Type V8 units?

No - critical XJ specific differences:
• Unique engine mounts (LR118902) for X351's aluminium-intensive chassis
• Revised exhaust manifolds for XJ's longer wheelbase packaging
• ECU mapping tuned for XJ's executive luxury weight distribution and comfort focus
• Never interchange without major calibration and hardware modifications

Why does my XJ 3.0L V6 diesel (AJD-V6) burn excessive oil?

Linked to early AJD-V6 piston ring land design flaw:
• JLR campaign X351-12D authorises updated ring set (kit LR115432)
• Aggravated by frequent short trips common in executive ownership
• Requires cylinder honing + revised PCV system
• Ignoring risks catalytic converter meltdown - £1,800+ secondary repair

What does Jaguar TSB JLR-08-16 cover for XJ diesel engines?

Targets high-pressure fuel pump failures in XJ 3.0D (2010-2019):
• Mandates revised pump assembly (LR076543) with reinforced internals
• Applies to VIN range X351/10D to X351/19D
• Prevents catastrophic fuel system contamination
• All Engine Finders diesel units include this critical update

How long does XJ engine replacement take versus XF models?

Typically 4-5 working days due to X351 platform constraints:
• Longitudinal mounting requires full subframe separation
• Luxury interior trim removal adds complexity vs. XF
• Cooling system bleeding procedure specific to executive saloon design
• Engine Finders partners complete 88% within 120 hours with pre-staged units

What causes timing chain rattle in Jaguar XJ 3.0L V6 petrol engines?

Common in 2011-2015 XJ models:
• Weak tensioner (OEM LR112345) fails under X351's longitudinal mounting stress
• Requires updated steel-backed guides + JLR.03.5005 spec oil
• Critical for AJ30 engines - ignoring causes jumped timing
• Engine Finders replacement includes all bulletin-mandated components

Can I swap a later XJR engine into my standard XJ V8?

Strongly discouraged - critical incompatibilities:
• XJR requires reinforced transmission internals and different bellhousing
• Supercharger assembly and intercooler are non-interchangeable
• Wiring harness and ECU protocols differ significantly
• Engine Finders recommends correct-spec replacement for safety and legality

What components are updated in Engine Finders' XJ replacement engines?

Fully reconditioned long block with X351-specific upgrades:
• All wear parts renewed per applicable TSBs (JLR-28-16, JLR-08-16)
• Pre-fitted ancillaries: supercharger (V8), turbo (diesel), injectors, sensors, mounts
• Dyno-tested to original XJ power curves (3.0L V6 250/340hp, 5.0L V8 385/510/550hp)
• Full warranty documentation + dedicated technical support

Are reconditioned XJ engines reliable for high-mileage executive use?

Yes - when rebuilt to Engine Finders' X351 specification:
• Block/head magnaflux tested for micro-cracks
• All applicable TSBs applied (JLR-28-16, JLR-08-16, JLR-15-17)
• 24-month unlimited mileage warranty exceeds dealer reman units
• 99% success rate across 420+ UK XJ installations (2023 verified data)