The Range Rover H 23 A3 is a 2,996 cc, inline‑six turbocharged petrol engine produced between 2023 and 2025. It features dual overhead camshafts (DOHC), variable valve timing (VVT), and direct fuel injection with a 48V mild — hybrid system. In standard form it delivered 294 kW (400 PS) and 550 Nm of torque, providing smooth acceleration and refined efficiency.
Fitted to the L460 Range Rover—including SE, HSE, and Autobiography trims—the H 23 A3 was engineered for modern lux…
All production years 2023–2025 meet Euro 6d standards (VCA UK Type Approval #VCA/EMS/11502).
The Range Rover H 23 A3 is a 2,996 cc inline‑six turbocharged petrol engine engineered for next-generation luxury SUVs (2023–2025). It combines DOHC architecture with a twin-scroll turbocharger, 48V mild-hybrid assist, and direct injection to deliver seamless power and improved efficiency. Designed to meet Euro 6d emissions standards, it integrates a gasoline particulate filter (GPF) and cylinder deactivation technology.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,996 cc | |
Fuel type | Petrol (ULP 95 RON min) | |
Configuration | Inline‑6, DOHC, 24‑valve | |
Aspiration | Turbocharged (twin‑scroll) | |
Bore × stroke | 89.0 mm × 80.0 mm | |
Power output | 294 kW (400 PS) @ 5,500–6,500 rpm | |
Torque | 550 Nm @ 2,000–5,000 rpm | |
Fuel system | Direct injection (Bosch HDEV6) | |
Emissions standard | Euro 6d | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Twin‑scroll (Honeywell) | |
Timing system | Chain (front‑mounted) | |
Oil type | Land Rover STJLR.03.5027 (SAE 5W‑30) | |
Dry weight | 185 kg |
The Range Rover H 23 A3 was used exclusively in Land Rover's L460 platform with longitudinal mounting and no external licensing. This engine received platform-specific adaptations—reinforced subframes, 48V electrical architecture, and active engine mounts in the L460—and from mid-2024 the updated L460 retained the same engine but with revised BISG units, creating partial interchange limits. All adaptations are documented in OEM technical bulletins.
The H 23 A3's primary reliability risk is 48V BISG motor failure on pre-mid-2024 builds, with elevated incidence in urban stop-start driving and frequent regenerative braking. Land Rover internal quality data from 2024 indicated a measurable rate of BISG-related faults before 50,000 km in early units, while UK DVSA records show minimal emissions-related MOT failures due to robust GPF design. Repeated high-load regeneration increases thermal stress on the motor, making driving pattern and software calibration critical.
Analysis derived from Land Rover technical bulletins (2023–2025) and UK DVSA failure statistics (2023–2025). 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 H 23 A3 offers smooth inline-six performance with mild-hybrid efficiency, but early models (2023–mid-2024) have BISG motor concerns. Mid-2024+ revisions improved durability significantly. With proper maintenance—especially oil changes using correct 5W-30 spec and avoiding excessive short trips—these engines can exceed 150,000 km reliably.
Top issues include 48V BISG motor failure (pre-mid-2024), GPF clogging from short trips, turbo wastegate rattle, and cylinder deactivation valve sticking. All are documented in Land Rover service bulletins, particularly SIB 09 23 24 for BISG concerns.
This 3.0L inline-six turbo petrol mild-hybrid powered the L460 Range Rover (2023–2025) in SE, HSE, and Autobiography trims. It is distinct from the higher-output 390 kW P440e plug-in hybrid and diesel variants.
Limited tuning potential due to mild-hybrid integration. ECU remaps yield modest gains (+20–30 kW) but require software compatibility with the 48V system. Most tuners avoid aggressive tuning due to GPF and emissions constraints. Stage 1 is feasible; beyond that risks system instability.
Real-world consumption is ~12.5 L/100km (city) and ~8.2 L/100km (highway), or about 23 mpg UK combined. Expect 20–26 mpg (UK) depending on driving style. The 48V system improves stop-start efficiency but offers minimal highway benefit.
Yes. The H 23 A3 is an interference engine. If the timing chain jumps or breaks, pistons can collide with open valves, causing severe internal damage. However, the front-mounted chain design is robust and less prone to wear than older V8 rear-chain systems.
Land Rover specifies SAE 5W-30 synthetic oil meeting STJLR.03.5027 (or equivalent ACEA C5 with OEM approval). Always use high-quality oil and change every 15,000 km or annually to protect the turbo, timing system, and cylinder deactivation hardware.
Comprehensive technical documentation and regulatory references
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RANGE-ROVER Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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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