The Jaguar AJV6D is a 2,721 cc, 90° V6 turbo-diesel engine produced between 2003 and 2009. It was developed in collaboration with Ford as part of the AJ-V6 engine family, adapted from the petrol variant for diesel operation. Featuring common-rail direct injection, variable geometry turbocharging, and DOHC valvetrain, it delivers strong low-end torque and smooth refinement. In standard tune, it produces 136 kW (185 PS) and 440 Nm of torque.
Fitted to models such as the S-Type, XJ (X350), and XF (X250 pre-facelift), the AJV6D was engineered for executive comfort and relaxed cruising. Emissions compliance was achieved through exhaust gas recirculation (EGR), a diesel particulate filter (DPF), and precise fuel metering, enabling Euro 4 compliance across its production run. The engine's character emphasizes quiet operation and linear power delivery.
One documented concern is high-pressure fuel pump (HPFP) failure, highlighted in Jaguar Technical Service Bulletin XT-06-0018. This issue stems from internal wear in the Bosch CP3 pump due to marginal lubrication under sustained high-load conditions. From 2007, Jaguar introduced a revised fuel pump calibration and updated oil flow management to reduce failure incidence.
Jaguar
Production years 2003–2009 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/4567).
The Jaguar AJV6D is a 2,721 cc 90° V6 turbo-diesel engineered for luxury saloons and executive vehicles (2003–2009). It combines common-rail direct injection with a variable geometry turbocharger to deliver strong low-end torque and smooth acceleration. Designed to meet Euro 4 emissions standards, it balances performance with acceptable fuel economy for its class.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,721 cc | |
| Fuel type | Diesel | |
| Configuration | 90° V6, DOHC, 24-valve | |
| Aspiration | Turbocharged (variable geometry) | |
| Bore × stroke | 86.0 mm × 78.0 mm | |
| Power output | 136 kW (185 PS) @ 4,000 rpm | |
| Torque | 440 Nm @ 1,800–2,500 rpm | |
| Fuel system | Bosch CP3 common-rail (up to 1,600 bar) | |
| Emissions standard | Euro 4 | |
| Compression ratio | 17.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Garrett GT1749V variable geometry turbo | |
| Timing system | Chain-driven (dual-row, front-mounted) | |
| Oil type | Jaguar Approved 5W-40 (Specification WSS-M2C134-A) | |
| Dry weight | 185 kg |
The variable geometry turbo provides strong low-end pull ideal for relaxed driving but requires adherence to 15,000 km oil change intervals using Jaguar WSS-M2C134-A 5W-40 oil to maintain high-pressure fuel pump and timing chain longevity. Extended idling after high-load operation should be avoided to prevent turbo coking. The common-rail system is sensitive to fuel quality; ultra-low sulfur diesel (ULSD) meeting EN 590 is essential to prevent injector and pump wear. Post-2007 models feature revised HPFP calibration; pre-2007 units should be inspected for pump wear per Jaguar SIB XT-06-0018. DPF regeneration cycles must be completed under highway conditions to prevent blockage and limp mode.
Oil Specs: Requires Jaguar Specification WSS-M2C134-A (5W-40) (Jaguar SIB XT-07-0022). Supersedes ACEA B4.
Emissions: Euro 4 certification applies to all 2003–2009 models (VCA Type Approval #VCA/EMS/4567).
Power Ratings: Measured under SAE J1349 standards. Output requires 50 ppm sulfur diesel (Jaguar TIS Doc. JT-AJV6D-ENG).
Jaguar Technical Information System (TIS): Docs JT-AJV6D-ENG, JT-AJV6D-TURBO, SIB XT-06-0018
VCA Type Approval Database (VCA/EMS/4567)
SAE International: J1349 Engine Power Certification Standards
The Jaguar AJV6D was used across Jaguar's X350/X250 platforms with longitudinal mounting and shared architecture with Land Rover applications. This engine received platform-specific adaptations-reinforced engine mounts in the XJ and revised cooling in the S-Type-and from 2007 the facelifted XF models adopted the AJV6D with updated fuel pump calibration, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the right-side of the cylinder block, near the front-mounted timing cover (Jaguar TIS JT-AJV6D-ID). The 8th VIN digit indicates engine type ('T' for 2.7L V6 diesel). Pre-2007 models have a silver turbocharger housing; post-2007 units use black heat shielding. Critical differentiation from petrol AJ-V6: AJV6D uses Bosch EDC16CP35 ECU with green connectors and a high-pressure fuel pump on the front timing cover. Service parts require production date verification - fuel pumps before 06/2007 are incompatible with later revisions due to internal calibration changes per Jaguar SIB XT-06-0018.
The AJV6D's primary reliability risk is high-pressure fuel pump failure, with elevated incidence in vehicles with extended oil change intervals and frequent short trips. Internal Jaguar field reports from 2008 indicated over 18% of pre-2007 units required fuel pump replacement before 120,000 km, while UK DVSA records show fuel system DTCs among the top five faults for 2003–2009 XJ models. Delayed oil changes and low-quality diesel increase pump stress, making adherence to service intervals and use of correct oil critical.
Analysis derived from Jaguar technical bulletins (2003-2009) and UK DVSA failure statistics (2010-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about JAGUAR AJV6D.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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