The Jaguar AJD4 is a 2,720 cc, inline — four turbo — diesel engine produced between 2004 and 2010. It features dual overhead camshafts (DOHC), 16 — valve architecture, and high — pressure common rail direct injection. In standard tune, it delivers 130 kW (177 PS) and 400 Nm of torque, providing strong low — end pulling power ideal for compact executive vehicles.
Fitted to models such as the X — Type (X400), S — Type (X204), and early XF (X250), the AJD4 was engineered for responsiv…
Jaguar
Production years 2004–2010 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/5678).
The Jaguar AJD4 is a 2,720 cc inline-four turbo-diesel engineered for executive sedans and estates (2004–2010). It combines common-rail direct injection with a variable geometry turbocharger to deliver strong mid-range torque and responsive driving dynamics. Designed to meet Euro 4 standards, it balances performance with regulated emissions control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,720 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged (VGT) | |
Bore × stroke | 85.0 mm × 94.6 mm | |
Power output | 130 kW (177 PS) @ 4,000 rpm | |
Torque | 400 Nm @ 1,750–2,500 rpm | |
Fuel system | Bosch CRS 2000 common-rail (up to 1,600 bar) | |
Emissions standard | Euro 4 | |
Compression ratio | 16.8:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single variable-geometry turbo (Garrett GT1749V) | |
Timing system | Chain-driven (double-row, front-mounted) | |
Oil type | Jaguar Specification WSS-M2C913-C (5W-30) | |
Dry weight | 175 kg |
The Jaguar AJD4 was used across Jaguar's X400/X204 platforms with longitudinal mounting and shared design lineage with later Land Rover units. This engine received platform-specific adaptations-fuel mapping revisions in the X-Type and enhanced cooling in the S-Type-and from 2007, updated HPFP calibration improved reliability. All adaptations are documented in OEM technical bulletins.
The AJD4's primary reliability risk is high-pressure fuel pump (HPFP) degradation, with elevated incidence in urban-driven vehicles with frequent low-fuel operation. Internal Jaguar field reports from 2011 indicated a significant share of pre-2007 units required HPFP replacement before 120,000 km, while UK DVSA MOT data shows DPF-related failures are common in short-trip usage. Extended oil intervals and low fuel levels increase pump and injector stress, making adherence to service schedules and fuel management critical.
Analysis derived from Jaguar technical bulletins (2004–2010) and UK DVSA failure statistics (2011–2023). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The AJD4 delivers strong torque and refinement, but pre-2007 models had reliability concerns, particularly HPFP failures. Later revisions (post-2007) improved pump durability through updated calibration. Well-maintained examples with regular servicing, proper oil (5W-30 WSS-M2C913-C), and consistent fuel levels above quarter-tank can achieve high mileage.
Key issues include high-pressure fuel pump failure (especially when run low on fuel), DPF clogging from short trips, EGR valve fouling, and turbo actuator sticking. These are documented in Jaguar service bulletins and field reports. Regular maintenance and proper driving cycles help prevent most issues.
The AJD4 engine was used in the Jaguar X-Type (X400, 2004–2010), S-Type (X204, 2004–2008), and early XF (X250, 2007–2010) as the 2.7 Diesel. It was also used in the Land Rover Freelander 2 (L359, 2006–2010) as the 2.7 TDV6. All models meet Euro 4 emissions standards.
Yes, the AJD4 is moderately tunable. ECU remaps can safely increase output by +20–30 kW on stage 1, leveraging the robust VGT turbo and common-rail system. However, over-tuning can strain the HPFP and DPF. Supporting modifications like upgraded intercooling and exhaust are recommended for higher stages.
In an X-Type 2.7 Diesel (2006), typical consumption is ~8.1 L/100km (city) and ~5.8 L/100km (highway), or about 40 mpg UK combined. Real-world figures vary, but 38–42 mpg (UK) is achievable with mixed driving and proper maintenance.
Yes. The AJD4 is an interference engine, meaning piston-to-valve contact occurs if the timing chain fails. The front-mounted chain is generally robust, but any signs of rattle or tensioner wear should be addressed immediately to prevent catastrophic internal damage.
Jaguar specifies 5W-30 synthetic oil meeting WSS-M2C913-C specification. This oil is critical for EGR/DPF compatibility and thermal stability. Change intervals should not exceed 15,000 km or 12 months, with more frequent changes advised for severe driving conditions.
Comprehensive technical documentation and regulatory references
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JAGUAR Official Site
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
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