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Jaguar AJ30 Engine - Replacement Cost, Problems & CompatibilityProblems & Compatibility
The naturally aspirated 3.0-litre V6 petrol engine fitted to the X-Type and S-Type from 1999 to 2009. Reconditioned units are available from approximately £3,500 .
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
Used from
£1,500
Reconditioned from
£3,500
Rebuilt from
£5,000
GB
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Quotes only from vetted UK engine specialists.
Key Specs
Jaguar AJ30 - Specifications at a Glance
Engine Code
AJ30
Fuel
Petrol
Configuration
3.0L V6, naturally aspirated, 24-valve DOHC
Power Output(s)
231-238 hp (depending on tune and model year)
Years Produced
1999-2009
UK Models Fitted
2 Jaguar models - full list in Compatibility below
Replaced
[None - initial modern Jaguar/Ford joint-venture V6]
Replaced By
AJ-V6 3.0 NA
Most Common Failure
Timing chain tensioner wear and ignition coil pack failure
Reconditioned Price Range
£3,500-£5,500 supply-only
Vetted UK specialists for AJ30 replacements
Minimum 12-month warranty on reconditioned and rebuilt options
Fitted To
Which Jaguar Models Use the AJ30-
The AJ30 is a 3.0-litre V6 petrol engine developed jointly by Jaguar and Ford (based on the Ford Duratec 30 architecture). It was introduced to provide a smooth, refined, and accessible entry point into Jaguar's petrol lineup, primarily powering the compact X-Type and the entry-level S-Type saloon.
| Model | Generation/Chassis | Badge(s) | Years | Link |
|---|---|---|---|---|
 Jaguar X-Type | X400 | X-Type 3.0 V6 | 2001-2009 | |
| Jaguar S-Type | X200 | S-Type 3.0 V6 | 1999-2008 |
02
Jaguar S-Type
CROSS-BRAND
AJ30 is documented across 2 BMW applications spanning Jaguar X-Type, Jaguar S-Type. Registration lookup confirms the exact suffix before quotes are sent.
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Not sure which engine your car has- Enter your registration above - we'll confirm your exact AJ30 fitment before any quotes are sent.
Prices
Jaguar AJ30 Engine Replacement Cost (UK)
Condition | Supply Only | Fitted (Independent Specialist) | Typical Warranty |
|---|---|---|---|
Used | £1,500-£3,000 | £2,150-£3,910 | 3-6 months |
Reconditioned | £3,500-£5,500 | £4,150-£6,410 | 12-24 months |
Rebuilt | £5,000-£7,500 | £5,650-£8,410 | 12-24 months |
The final cost of a Jaguar AJ30 engine replacement is heavily influenced by the service history of the donor unit. Specifically, whether the timing chain tensioners, coolant crossover pipes, and ignition coil packs have been proactively addressed. Units rebuilt with upgraded tensioners and a full ignition system refresh command a slight premium but prevent near-term repeat failures. For a detailed breakdown of how specific component conditions affect the overall Jaguar AJ30 engine cost, see our full reconditioned engine cost guide.
Labour Guide
Fitting an AJ30 typically takes 8-12 hours at £65/hr (independent specialist) - confirm exact labour when comparing quotes.
Price Factors
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Common Problems
Jaguar AJ30 Engine Problems - What Actually Fails
Every engine has its weak points. Here are the known issues with the AJ30, based on real-world data and verified failure patterns.
Verified issue focus: Timing chain tensioner wear and ignition coil pack failure.
1. Timing Chain Tensioner Wear
1. Timing Chain Tensioner Wear
Typical onset:
70,000-110,000 miles
What happens:
The hydraulic timing chain tensioners can lose pressure over time, leading to chain slap, stretched chains, and in severe cases, valve-to-piston contact. A distinct rattling noise on cold startup is the primary early warning sign.
Repair vs replace:
If caught early, tensioner and chain replacement is viable. If the chain has jumped time or damaged valves, a full reconditioned or rebuilt unit is the only safe route. Read our full timing chain failure guide.
Read more about this issue
2. Ignition Coil Pack Failure
2. Ignition Coil Pack Failure
Typical onset:
60,000-100,000 miles
What happens:
The individual ignition coil packs are prone to heat degradation and internal shorting. This results in cylinder misfires, a rough idle, reduced power, and an illuminated check engine light.
Repair vs replace:
Coil packs are a straightforward, relatively inexpensive maintenance replacement and do not require a full engine replacement unless severe misfires have been ignored long enough to cause catalytic converter damage.
Read more about this issue
3. Coolant Crossover Pipe Leaks
3. Coolant Crossover Pipe Leaks
Typical onset:
80,000-120,000 miles
What happens:
The plastic coolant crossover pipes and associated gaskets in the valley of the V6 degrade under repeated heat cycles, leading to external coolant leaks. If ignored, this can lead to overheating and subsequent head gasket failure.
Repair vs replace:
Pipe and gasket replacement is a standard maintenance fix. However, if overheating has already occurred, the cylinder heads may be compromised, necessitating a full engine replacement. Read our full coolant system failure guide.
Read more about this issue
Post-2004 AJ30 units saw minor revisions to ignition components and gasket materials, making them marginally more robust, though the fundamental architecture and its known wear patterns remained consistent throughout the production run .
Compare rebuilt AJ30 prices with the failure already addressed
Engine Variants
How to Confirm You Have the AJ30
The AJ30 is a specific 3.0-litre iteration of the Jaguar/Ford joint-venture V6 family. While it shares its core architecture with the smaller 2.5-litre variant and the later 3.0-litre revisions, confirming your exact code is critical because internal components and engine management calibrations are not always interchangeable. WHERE TO FIND THE CODE: The engine code is stamped on a machined pad on the engine block, usually visible near the bellhousing or on the cylinder head cover. It will also be explicitly listed on your V5C registration document under "Engine Code" or "Engine Capacity", and can be decoded directly from your 17-character VIN. COMMONLY CONFUSED CODES: - AJ-V6 3.0 NA: The later iteration of the 3.0L V6. While it shares the same core architecture, it features revised engine management, updated sensors, and minor internal refinements, making a direct swap problematic without ECU and loom updates. - AJ25: The 2.5-litre variant of this exact same V6 family, fitted primarily to the X-Type. While externally similar, the AJ25 has different bore dimensions, a different crankshaft, and distinct internal components, making it a non-straight swap. Why fitting the wrong revision matters: Attempting to swap a 2.5L long block or a later 3.0L revision into an early AJ30 chassis without updating the ECU, wiring loom, and intake/exhaust plumbing will result in persistent fault codes, poor drivability, and potential sensor incompatibility. CLOSING LINE: Not 100% sure- Enter your registration above - we'll confirm your exact AJ30 fitment before any quotes are are sent.
Easily Confused
AJ-V6 3.0 NA
- the later iteration of the 3.0L V6 family, featuring revised engine management, updated sensors, and minor internal refinements, though sharing the same core architecture.
Alternative / Next-Gen Code
AJ25
- the 2.5-litre variant of this exact same V6 family, fitted primarily to the X-Type; while externally similar, the AJ25 has different bore dimensions, a different crankshaft, and distinct internal components, making it a non-straight swap.
Confirm the exact AJ30 fitment
Buying Guide
Buying a Replacement AJ30 - What to Choose
Choosing the right replacement route depends on your budget, risk tolerance, and ownership goals. Here's a breakdown of your options.
Used:
A used Jaguar AJ30 engine is only advisable if it comes with a comprehensive, documented service history proving that the timing chain tensioners and ignition coil packs have been recently replaced. This option is generally reserved for higher-value host vehicles (e.g., a well-maintained, low-mileage X-Type) where the budget is tight. Without this specific history, the risk of inheriting the same wear-related failures is unacceptably high. Explore our vetted used Jaguar AJ30 engine network.
Reconditioned:
A proper reconditioned Jaguar AJ30 engine is the most balanced and recommended choice for the majority of owners. A quality, specialist-led rebuild will systematically replace the known weak points: upgraded timing chain tensioners, revised plastic coolant crossover pipes, and a full refresh of the ignition coil packs and gaskets. This effectively resets the engine's reliability clock and is the most cost-effective way to secure long-term peace of mind. Compare reconditioned Jaguar AJ30 engine options.
Rebuilt:
A full rebuild is justified for high-mileage examples, vehicles that have suffered from oil starvation or overheating, or if the cylinder walls show measurable scoring. An upgraded rebuild should include new pistons, a reground crankshaft, and a complete refresh of the oil pump and pickup, ensuring the engine can reliably handle another 100,000+ miles. View rebuilt Jaguar AJ30 engine specifications.
Supply & Fit Line:
Buying through the EnginesMarket network means you can opt for a full supply and fit service, with the replacement engine installed by a Jaguar specialist and backed by a nationwide warranty. Learn more about supply and fit.
Vehicle Value Note:
The Jaguar AJ30 is typically found in host vehicles (like the X-Type X400 or early S-Type X200) valued between £1,500 and £6,000 depending on condition and mileage. If your vehicle is at the lower end of this spectrum (e.g., an early X-Type valued under £3,000), a £3,500+ reconditioned Jaguar AJ30 engine replacement may approach or exceed 60% of the car's total current market value. In these specific cases, we strongly advise evaluating the vehicle's scrap or part-exchange value before committing to a full Jaguar AJ30 engine replacement.
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Related Engines
Engines Related to the Jaguar AJ30
Explore engines that are closely related to the Jaguar AJ30, including its predecessor, successor, and key family variants.
Predecessor
None
the AJ30 was the first modern Jaguar/Ford joint-venture V6, replacing older inline-six and V6 units which are mechanically unrelated and not interchangeable.
Successor
AJ-V6 3.0 NA
- the later iteration of the 3.0L V6 family, featuring revised engine management, updated sensors, and minor internal refinements, though sharing the same core architecture.
Sibling
AJ25
- the 2.5-litre variant of this exact same V6 family, fitted primarily to the X-Type; while externally similar, the AJ25 has different bore dimensions, a different crankshaft, and distinct internal components, making it a non-straight swap.
FAQ
Jaguar AJ30Frequently Asked Questions
Question 1How much does a Jaguar AJ30 engine replacement cost-
A reconditioned Jaguar AJ30 engine typically costs between £3,500 and £5,500 for supply only. Fitted costs through an independent specialist will add approximately £520-£780 in labour. Used units are available from £1,500 but carry a higher risk of inherited wear.
- Fitted costs through an independent specialist will add approximately £520-£780 in labour.
- Used units are available from £1,500 but carry a higher risk of inherited wear.
Question 2What is the most common failure with the AJ30-
The most common failure is timing chain tensioner wear, particularly as the engine approaches 70,000 miles. A distinct rattling noise on cold startup is the primary early warning sign. If ignored, this can lead to chain slap, jumped timing, and catastrophic valve-to-piston contact.
- A distinct rattling noise on cold startup is the primary early warning sign.
- If ignored, this can lead to chain slap, jumped timing, and catastrophic valve-to-piston contact.
Question 3Which Jaguar models use the AJ30 engine-
The AJ30 was fitted to the Jaguar X-Type (X400) and Jaguar S-Type (X200) between 1999 and 2009. It served as the entry-level petrol engine below the V8 range, providing a smooth, refined alternative. It was developed jointly by Jaguar and Ford, based on the Duratec 30 architecture.
- It served as the entry-level petrol engine below the V8 range, providing a smooth, refined alternative.
- It was developed jointly by Jaguar and Ford, based on the Duratec 30 architecture.
Question 4Should I buy a used or reconditioned AJ30 engine-
A reconditioned Jaguar AJ30 is strongly recommended over a used unit due to the high risk of inherited timing chain and coolant crossover issues. A proper rebuild will systematically replace the known weak points, including upgraded tensioners and revised plastic coolant pipes. A used unit is only advisable if it comes with comprehensive, documented proof that these specific preventative repairs have already been completed.
- A proper rebuild will systematically replace the known weak points, including upgraded tensioners and revised plastic coolant pipes.
- A used unit is only advisable if it comes with comprehensive, documented proof that these specific preventative repairs have already been completed.
Question 5How do I know if my car has the AJ30 engine-
The engine code is stamped on a machined pad on the engine block, usually visible near the bellhousing or on the cylinder head cover. It will also be explicitly listed on your V5C registration document under 'Engine Code' or 'Engine Capacity', or can be decoded directly from your 17-character VIN.
- It will also be explicitly listed on your V5C registration document under "Engine Code" or "Engine Capacity".
- You can also decode it directly from your 17-character VIN.
Compare Jaguar AJ30 Engine Prices Today
Get a free, no-obligation price comparison for your exact Jaguar AJ30 engine. Our registration lookup confirms your precise fitment before any quotes are sent, ensuring you receive accurate, compatible options. With reconditioned AJ30 units starting from £3,500, comparing takes two minutes and could save you hundreds on your replacement.
Vetted UK Specialists
Vetted UK specialists for AJ30 replacements
Minimum 12-Month Warranty
Minimum 12-month warranty on reconditioned and rebuilt options
Nationwide Delivery
Nationwide delivery plus supply and fit availability
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Secure enquiry - no spam. Quotes only from vetted UK engine specialists.
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