How much does a Jaguar S-TYPE 2.5 V6 engine rebuild cost?

Our S-TYPE 2.5 V6 (AJ25) engine rebuilds cost £5,600–£6,100, including fitment, ECU reset, road test, and 12-month unlimited mileage warranty. This covers all labor, OEM-spec parts including thermostat housing LR012345 and timing chain kit LR096682, with no hidden fees. The process takes 5-7 working days at our Billericay workshop.

Is the AJ25 engine reliable for daily executive use?

Yes, with proper maintenance. The AJ25 engine in the S-TYPE 2.5 V6 is known for smooth operation but has specific weak points like thermostat housing cracks. We've rebuilt over 150+ AJ25 engines since 2009 with reinforced components. For daily executive use, our rebuilds include upgraded thermostat housing LR012345 and complete gasket renewal, ensuring reliable performance for urban commuting from our Billericay workshop.

What's the most common cause of overheating in S-TYPE 2.5 V6?

Thermostat housing cracks are the most common cause of overheating in S-TYPE 2.5 V6 models. The plastic housing (part LR012345) degrades over time due to thermal cycling. Our solution includes replacing it with a reinforced unit, performing a complete cooling system flush, and pressure testing to JLR specifications. This addresses 95% of overheating issues we see in X200/X202 chassis codes at our Billericay workshop.

Can I get ECU coding for my S-TYPE 2.5 V6?

Yes - we use Autologic and JLR SDD tools for full ECU coding on S-TYPE 2.5 V6 engines. This includes proper adaptation of the updated thermostat housing, ignition coil parameters, and timing chain tensioner settings. Our technicians at Unit A5 Windsor Road, Ramsden Heath, Billericay are certified in Jaguar diagnostics and can perform complete immobilizer sync and system adaptation for your AJ25 engine.

Are S-TYPE 2.5 V6 engines different from 3.0 or 4.2 variants?

Yes - the 2.5 V6 (AJ25) has specific differences from larger variants. It uses a different thermostat housing (LR012345 vs LR072310), unique ignition coil configuration, and distinct timing chain components. The AJ25 also lacks certain emissions systems found on later engines. Our rebuilds address these AJ25-specific requirements with precision metrology (<0.05mm tolerance) at our Billericay workshop, ensuring compatibility with your X200/X202 chassis.

How long does a typical S-TYPE 2.5 V6 engine rebuild take?

Our standard rebuild takes 5-7 working days at our Billericay workshop. This includes complete disassembly, precision metrology, machining where needed, component upgrades (like thermostat housing LR012345), and rigorous validation including a 45-minute dyno run and 15-mile road test. For urgent cases, we offer a priority service with 3-4 day turnaround, though this depends on parts availability for your specific AJ25 engine.

Jaguar S-TYPE R-Derived Performance Packs Engine Specialists – Rebuilt In-House | 12-Month Warranty

Q: How long does a typical S-TYPE 2.5 V6 engine rebuild take?

Our standard rebuild takes 5-7 working days at our Billericay workshop. This includes complete disassembly, precision metrology, machining where needed, component upgrades (like thermostat housing LR012345), and rigorous validation including a 45-minute dyno run and 15-mile road test. For urgent cases, we offer a priority service with 3-4 day turnaround, though this depends on parts availability for your specific AJ25 engine.

Expert rebuilds for every Jaguar S-TYPE R-Derived Performance Packs. In-house, OEM-spec, 12-month warranty.

Jaguar S-TYPE R-Derived Performance Packs - Professional Engine Rebuild

✓ In-House Rebuilds - Not sourced or exchanged | ✓ OEM-Spec Components - Mahle, Elring, Jaguar Genuine Parts (e.g., turbo actuator LR072310) | ✓ 12-Month Unlimited Mileage Warranty - Issued by us | 👉 Get Your Jaguar S-TYPE R-Derived Performance Packs Engine Quote ✓ In-House Rebuilds - Not sourced or exchanged | ✓ OEM-Spec Components - Mahle, Elring, Jaguar Genuine Parts (e.g., turbo actuator LR072310) | ✓ 12-Month Unlimited Mileage Warranty - Issued by us | 👉 Get Your Jaguar S-TYPE R-Derived Performance Packs Engine Quote

Expert rebuilds for every Jaguar S-TYPE R-Derived Performance Packs. In-house, OEM-spec, 12-month warranty.

Jaguar S-TYPE R-Derived Performance Packs Engine Replacement – Rebuilt In-House | 12-Month Warranty

At JLR Engine Specialists Ltd, every S-TYPE R-Derived Performance Packs engine is rebuilt in our dedicated workshop using only Jaguar-approved components. The S-TYPE R-Derived Performance Packs spans the classic S-Type era (2002-2008), and we support all factory-fitted engines. With over 120 S-TYPE R-Derived Performance Packs engines restored since 2017, we provide transparent, all-in pricing and a 12-month unlimited mileage warranty - backed by our specialist team.

Common S-TYPE R-Derived Performance Packs Engine Problems

These are the most frequent S-TYPE R-Derived Performance Packs engine issues we diagnose and repair in our workshop. Our solutions address the root cause, not just the symptoms.

Symptom	Likely Cause	Our Solution
Engine hesitation during acceleration	4.2L V8 Supercharged throttle body issues (LR000721)	Updated throttle body assembly + ECU recalibration per JLR TSB-2005-014
Oil leaks around engine block	Valve cover gasket failure in high-mileage S-TYPE R-Derived Performance Packs	Complete gasket replacement with upgraded silicone seals + torque specification verification
Overheating during extended drives	Coolant system degradation in S-TYPE R-Derived Performance Packs V8 engines	Full cooling system overhaul including thermostat, water pump, and hoses with OEM-spec components
Rough idle at cold start	Fuel injector clogging in S-TYPE R-Derived Performance Packs 4.2L V8	Ultrasonic fuel injector cleaning and flow testing to factory specifications

Why Choose JLR Engine Specialists Workshop?

We're a specialist JLR engine workshop - not a broker or general garage. Every S-TYPE R-Derived Performance Packs engine is rebuilt in-house by our technicians, using only OEM-spec or premium aftermarket parts (Mahle, Elring, Jaguar).

Our service includes:

Full strip-down and precision metrology

Comprehensive valve train inspection for S-TYPE R-Derived Performance Packs high-performance engines
Diagnostics with Autologic and JLR SDD tools

Specialized for Jaguar's AJ-V8 platform in S-TYPE R-Derived Performance Packs
Upgrades for S-TYPE R-Derived Performance Packs-specific stress points

Reinforced oil pump housings for sustained high-RPM operation
12-month unlimited mileage warranty - issued directly by us
UK-wide vehicle collection

Logistics handled from our Unit A5 Windsor Road, Ramsden Heath facility

Since 2017, we've helped classic Jaguar enthusiasts, performance-oriented drivers, and collectors restore reliability - with no hidden diagnostics fees if you proceed.

JLR Engine Specialist working on Jaguar S-TYPE R-Derived Performance Packs

Our In-House Rebuild Process

Every S-TYPE R-Derived Performance Packs engine undergoes our 5-step rebuild process:

Diagnosis

Comprehensive scan for AJ-V8 specific fault codes, focusing on supercharger and high-performance components unique to S-TYPE R-Derived Performance Packs

Metrology

Supercharger health assessment
Valve train inspection
Timing chain tensioner evaluation

Metrology

Measure cylinder wear, bearing clearances (<0.05mm tolerance)

Precision Standards

Crankshaft runout (<0.05mm)
Bearing clearance measurement
Cylinder bore wear assessment

Machining

Block honing, head skimming - all done on-site

On-Site Facilities

CNC cylinder head skimming
Pressure testing
Plateau honing

Upgrades

4.2L V8 → upgraded oil pump housing; complete supercharger system inspection

S-TYPE R-Derived Performance Packs Specific Upgrades

Supercharger complete rebuild with upgraded seals
Upgraded valve cover gaskets LR000721
ECU recalibration

Validation

45-minute dyno run + 15-mile performance road test (high-RPM verification)

Testing Protocol

45-minute dyno run
15-mile performance driving simulation
Supercharger function verification

Diagnosis

Comprehensive scan for AJ-V8 specific fault codes, focusing on supercharger and high-performance components unique to S-TYPE R-Derived Performance Packs

Comprehensive Testing

Supercharger health assessment
Valve train inspection
Timing chain tensioner evaluation

Metrology

Measure cylinder wear, bearing clearances (<0.05mm tolerance)

Precision Standards

Crankshaft runout (<0.05mm)
Bearing clearance measurement
Cylinder bore wear assessment

Machining

Block honing, head skimming - all done on-site

On-Site Facilities

CNC cylinder head skimming
Pressure testing
Plateau honing

Upgrades

4.2L V8 → upgraded oil pump housing; complete supercharger system inspection

S-TYPE R-Derived Performance Packs Specific Upgrades

Supercharger complete rebuild with upgraded seals
Upgraded valve cover gaskets LR000721
ECU recalibration

Validation

45-minute dyno run + 15-mile performance road test (high-RPM verification)

Testing Protocol

45-minute dyno run
15-mile performance driving simulation
Supercharger function verification

Engine Deep Dives

Detailed breakdown of each Jaguar S-TYPE R-Derived Performance Packs engine we rebuild, with our specialist approach to common issues.

4.2L V8 Supercharged (2002-2008) – The Performance Powerhouse

Engine Code: AJ34S

Configuration: V8, 4,196cc, 400 HP, supercharged

Weak Points: Supercharger oil leaks, valve cover gasket failures, throttle body issues

Our Approach: Complete supercharger rebuild, upgraded gaskets, throttle body replacement

Estimated Price:

£6,850–£7,450

4.2L V8 Supercharged – 4.2L Petrol Engine for Jaguar S-TYPE R-Derived Performance Packs

4.2L V8 – 4.2L Petrol

S-TYPE R-Derived Performance Packs Use Case Specialization

The S-TYPE R-Derived Performance Packs was designed for high-performance driving

We tailor rebuilds for:

Classic Performance Enthusiasts: Maintaining original performance characteristics while improving reliability

High-Mileage Owners: Addressing wear patterns specific to aging supercharged V8 engines

Collectors: Preserving authenticity with performance upgrades where needed

Our Engine Specialties:

Remanufactured supercharger assemblies
Upgraded valve cover gaskets LR000721
Precision-balanced crankshafts
Throttle body assemblies LR000721
Supercharger oil cooler system upgrades

Rebuilt vs. Used Engines

Used engines often fail within months due to hidden stress damage. Our rebuilt units include:

Used Engine Risks

Hidden wear from high-performance driving in S-TYPE R-Derived Performance Packs
Supercharger damage not visible during inspection
Incompatible with S-TYPE R-Derived Performance Packs-specific ECU programming
No warranty on supercharger components
£4,200 "bargain" that fails during spirited driving

Our Rebuilt Engines

Complete disassembly and inspection of all performance components
OEM-spec supercharger rebuild with upgraded seals
12-month unlimited mileage warranty covering all components
No hidden diagnostics fees if you proceed
Specialized for S-TYPE R-Derived Performance Packs high-performance requirements