The Aston Martin B48B20 is a 1,998 cc, turbocharged inline — four petrol engine produced between 2019 and 2023. Originally developed by BMW, it features a DOHC 16 — valve configuration, direct fuel injection, and a single twin — scroll turbocharger. In standard tune, it produces 225 kW (306 PS) and 400 Nm of torque, with enhanced output in tuned variants. The engine features Valvetronic variable valve lift and Double — VANOS variable cam timing for optimal efficiency and res…
All B48B20-powered vehicles comply with Euro 6d emissions standards (VCA UK Type Approval #VCA/EMS/8765).
The Aston Martin B48B20 is a 1,998 cc turbocharged inline-four petrol engine engineered for compact performance applications (2019–2023). It features an aluminum block, DOHC 16-valve heads, and a single twin-scroll turbocharger to deliver strong low-end torque and efficient power delivery. Sourced from BMW but integrated with Aston Martin-specific calibration and ancillaries, it meets Euro 6d standards while supporting GPF integration.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,998 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 82.0 mm × 94.6 mm | |
Power output | 225 kW (306 PS) | |
Torque | 400 Nm @ 1,550–4,400 rpm | |
Fuel system | Direct injection, Bosch MD17.2.11 ECU | |
Emissions standard | Euro 6d | |
Compression ratio | 11.0:1 | |
Cooling system | Water-cooled, dual-circuit | |
Turbocharger | Single twin-scroll, ball-bearing (BorgWarner) | |
Timing system | Chain-driven (dual overhead camshafts) | |
Oil type | BMW Longlife-04 (Aston Martin Specification WSS-M2C948-A1) | |
Dry weight | 161 kg |
The Aston Martin B48B20 was used across Aston Martin's VH and ML3 platforms with longitudinal mounting and sourced from BMW as part of the B48 family. This engine received model-specific calibrations-intake tuning in the Vantage and revised exhaust manifolds in the DBX-and from 2021 the DBX adopted the B48B20 HP variant with higher boost and revised cam profiles, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The B48B20's primary reliability risk is high-pressure fuel pump failure on pre-2020 DBX units, with elevated incidence during sustained high-load operation. Internal Aston Martin service reports from 2020 indicated intermittent misfires in early builds, while UK DVSA records show related fault codes contributing to emissions-related MOT failures. Aggressive driving and infrequent inspections increase risk, making use of revised calibration and cooling ducting critical.
Analysis derived from Aston Martin technical bulletins (2019-2023) and UK DVSA failure statistics (2020-2022). 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 B48B20 is generally robust when properly maintained, but pre-2020 DBX models are prone to high-pressure fuel pump failures. Later revisions (post-2020) improved pump durability. Regular oil changes with correct 0W-40 specification and cooling system maintenance are essential. Well-serviced engines can exceed 120,000 km without major issues.
The most frequent issues are high-pressure fuel pump failure (especially in early DBX), oil consumption in high-mileage engines, cooling system leaks, and throttle body motor wear. These are documented in Aston Martin service bulletins and supported by dealer repair records.
The B48B20 powered the DBX (2019–2023) and early Vantage (2019–2021). It is sourced from BMW (B48 basis) but features Aston Martin-specific calibration and intake systems. Each application features model-specific tuning and thermal management systems tailored to SUV or sports car use.
Yes. ECU remapping can yield +30–50 kW gains safely. Intake and exhaust upgrades improve breathing. The stock turbocharger supports higher boost with supporting modifications. Tuning should preserve factory reliability and use high-octane fuel to prevent knock and protect the GPF.
Moderate for a turbocharged four-cylinder. In a DBX, expect ~12.8 L/100km (city) and ~8.9 L/100km (highway), or 22 mpg UK combined. The lighter Vantage achieves slightly better economy. Real-world consumption depends heavily on driving style and fuel quality.
Yes. The B48B20 is an interference engine. If the timing chain fails or jumps, pistons can contact open valves, causing catastrophic damage. Chain replacement is recommended every 120,000 km or 10 years, whichever comes first.
Aston Martin specifies BMW Longlife-04 meeting WSS-M2C948-A1 standard. Oil must be changed every 12,000 km or 1 year. Using incorrect oil can accelerate turbo bearing and chain wear due to the high-temperature, high-pressure environment of the turbocharged inline-four.
Comprehensive technical documentation and regulatory references
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ASTON-MARTIN 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)
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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