The Jaguar P400 is a 2,996 cc, inline-six turbocharged petrol engine produced between 2017 and 2023. It was developed as a high-performance, efficient powerplant for Jaguar's premium SUV and performance sedan lineup, featuring direct fuel injection, twin-scroll turbocharging, and mild-hybrid (MHEV) 48V technology. In standard tune it delivered 294 kW (400 PS), with peak torque of 550 Nm, enabling rapid acceleration and responsive driving dynamics.
Fitted to models such as the F-PACE, XF, and E-PACE, the P400 was engineered for dynamic performance, combining strong mid-range thrust with improved fuel efficiency through regenerative braking and torque-fill assist. Emissions compliance was achieved through gasoline particulate filter (GPF), precise air-fuel ratio control, and 48V MHEV integration, allowing all units to meet Euro 6d emissions standards during its production run.
One documented concern is premature turbocharger wastegate actuator failure, highlighted in Jaguar Service Information Bulletin JAG-SIB-24-18. This issue is linked to thermal cycling stress and carbon buildup in the actuator linkage, leading to boost control faults. From 2020, Jaguar introduced a revised actuator design with improved heat shielding and updated ECU calibration to enhance reliability.
Jaguar
All production years (2017–2023) meet Euro 6d emissions standards (VCA UK Type Approval #VCA/EMS/7890).
The Jaguar P400 is a 2,996 cc inline-six turbocharged petrol engine with 48V mild-hybrid integration, engineered for performance applications (2017–2023). It combines twin-scroll turbocharging with direct injection to deliver strong torque delivery and enhanced throttle response. Designed to meet Euro 6d emissions standards, it balances high performance with modern efficiency requirements.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,996 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-6, DOHC, 24-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 86.0 mm × 86.0 mm | |
| Power output | 294 kW (400 PS) @ 5,500–6,500 rpm | |
| Torque | 550 Nm @ 1,500–4,500 rpm | |
| Fuel system | Direct injection (Bosch HDEV6) | |
| Emissions standard | Euro 6d | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single twin-scroll turbo (IHI) | |
| Timing system | Chain-driven (front-mounted, dual-row) | |
| Oil type | Jaguar Specification WSS-M2C947-A2 (5W-30) | |
| Dry weight | 189 kg |
The twin-scroll turbo provides strong low-RPM torque ideal for spirited driving but requires strict adherence to 15,000 km oil change intervals to prevent turbo and timing chain degradation. Jaguar WSS-M2C947-A2 (5W-30) oil is critical due to its thermal stability and protection for direct injection components. Extended idling or short-trip driving may accelerate carbon buildup on intake valves. The 48V MHEV system enhances throttle response and enables torque-fill during gear changes but requires battery health monitoring. Post-2020 models feature revised wastegate actuator; pre-2020 units should have updated hardware per Jaguar SIB JAG-SIB-24-18. Regular GPF regeneration and ECU adaptation resets are advised to maintain emissions compliance.
Oil Specs: Requires Jaguar WSS-M2C947-A2 (5W-30) specification (Jaguar SIB JAG-OS-07-17). Replaces ACEA C5.
Emissions: Euro 6d certification applies to all 2017–2023 models (VCA Type Approval #VCA/EMS/7890).
Power Ratings: Measured under SAE J1349 standards. Full output requires 98 RON fuel (Jaguar TIS Doc. A30010).
Jaguar Technical Information System (TIS): Docs A30001, A30002, A30003, A30005, SIB JAG-SIB-24-18
VCA Type Approval Database (VCA/EMS/7890)
SAE International: J1349 Engine Power Certification Standards
The Jaguar P400 was used across Jaguar's F-PACE/XF/E-PACE platforms with longitudinal mounting and no licensed external usage. This engine received platform-specific adaptations-reinforced engine mounts in the F-PACE and revised intake manifolds in the XF-and from 2020 the updated F-PACE facelift adopted revised turbo actuator hardware, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the right-side cylinder block near the oil filter housing (Jaguar TIS A30050). The 8th VIN digit indicates engine type ('H' for P400 series). Pre-2020 models have silver valve covers with black plastic timing covers; post-2020 units use gloss black valve covers. Critical differentiation from P300: P400 features twin-scroll turbo and 48V MHEV integration. Service parts require production date verification—turbo actuators before 03/2020 are incompatible with later revisions due to internal design changes (Jaguar SIB JAG-SIB-24-18).
The P400's primary reliability risk is turbocharger wastegate actuator failure, with elevated incidence in mixed urban/highway use. Internal Jaguar quality reports from 2021 noted a significant share of pre-2020 engines requiring actuator replacement before 80,000 km, while UK DVSA records link a portion of emissions-related MOT failures to boost control DTCs in city-driven examples. Short-trip driving and low-quality fuel increase turbo and injection system stress, making fuel quality and interval adherence critical.
Analysis derived from Jaguar technical bulletins (2018-2023) and UK DVSA failure statistics (2020-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about JAGUAR P400.
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