The Subaru e-Boxer 2.0L is a 1,995 cc, horizontally opposed (boxer) four-cylinder petrol engine integrated with a permanent-magnet synchronous electric motor, produced from 2019 to present. It forms part of Subaru’s mild-hybrid system, featuring direct injection, dual overhead camshafts (DOHC), and a continuously variable transmission (CVT) with Lineartronic control. The combined system delivers 110–112 kW (150–152 PS) and torque of 196 Nm (engine) plus 66 Nm (electric motor), enabling responsive low-speed electric-only operation and reduced emissions.
Fitted to models such as the XV (GT), Forester (e-Boxer), and Outback (mild-hybrid variants), the e-Boxer was engineered for urban efficiency and all-weather AWD capability without compromising Subaru’s signature balance and traction. Emissions compliance is achieved through stratified lean-burn combustion, cooled exhaust gas recirculation (EGR), and an underfloor three-way catalytic converter, meeting Euro 6d TEMP and later Euro 6d standards.
One documented concern is inverter coolant pump degradation in early-build units (2019–2021), highlighted in Subaru Technical Service Bulletin 04-21-20. This issue stems from premature seal wear in the electric coolant pump, potentially triggering hybrid system shutdowns. From MY2022, Subaru introduced a revised pump assembly with improved sealing materials and updated control logic.
Production years 2019–2021 meet Euro 6d TEMP standards; 2022–2025 models comply with Euro 6d (VCA UK Type Approval #VCA/EMS/8765).
The Subaru e-Boxer 2.0L is a 1,995 cc horizontally opposed four-cylinder mild-hybrid engineered for compact and mid-size SUVs (2019–2025). It combines direct fuel injection with a 12.3 kWh lithium-ion battery and 66 Nm electric motor to deliver smooth low-speed electric propulsion and enhanced fuel economy. Designed to meet Euro 6d TEMP and Euro 6d standards, it balances all-wheel-drive capability with urban emissions compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,995 cc | |
| Fuel type | Petrol (RON 95 min) | |
| Configuration | Horizontally opposed-4, DOHC, 16-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 86.0 mm × 86.0 mm | |
| Power output | 110–112 kW (150–152 PS) combined | |
| Torque | 196 Nm @ 4,000 rpm (engine) + 66 Nm (electric motor) | |
| Fuel system | Direct injection (Subaru D-4S) | |
| Emissions standard | Euro 6d TEMP (2019–2021); Euro 6d (2022–2025) | |
| Compression ratio | 12.0:1 | |
| Cooling system | Water-cooled (dual circuit: engine + inverter) | |
| Turbocharger | None | |
| Timing system | Chain-driven DOHC | |
| Oil type | Subaru 0W-20 (API SN/SP, ILSAC GF-6) | |
| Dry weight | 168 kg (engine only) |
The e-Boxer’s electric motor enables silent, zero-emission creep at low speeds but requires consistent 12V auxiliary battery health to support hybrid control modules. Subaru 0W-20 oil is essential for optimal fuel economy and valve-train protection under frequent stop-start cycles. The inverter coolant circuit must be inspected every 60,000 km; early pumps (pre-2022) are prone to seal failure per SIB 04-21-20. Use only RON 95+ fuel to prevent knock under high-load AWD conditions. Regenerative braking performance degrades if brake pad wear sensors are not reset after service.
Oil Specs: Requires Subaru 0W-20 (API SN/SP, ILSAC GF-6) (Subaru SIB 04-21-20). Not interchangeable with older 5W-30 specs.
Emissions: Euro 6d TEMP applies to 2019–2021 models (VCA Type Approval #VCA/EMS/8765). Full Euro 6d compliance from 2022 onward.
Power Ratings: Measured under UN ECE R85. Combined output includes 12.3 kWh hybrid assist (Subaru TIS Doc. P19-3301).
Subaru Technical Information System (TIS): Docs H21-7890, F33-1120, E45-2021, SIB 04-21-20
VCA Type Approval Database (VCA/EMS/8765)
UNECE Regulation No. 85 – Engine Power Measurement
The Subaru e-Boxer 2.0L was used across Subaru's SGP (Subaru Global Platform) SUVs with longitudinal mounting and no external licensing. This engine received platform-specific adaptations—reinforced rear subframes in the Forester and modified CVT cooling in the XV—and from 2022 the updated inverter pump and battery management system, creating minor service part distinctions. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the left-side cylinder block near the exhaust manifold (Subaru TIS H21-7890). The 7th VIN digit is 'H' for e-Boxer variants. All e-Boxer models feature a blue Subaru badge and 'e-BOXER' rear emblem. Critical differentiation from FB20: e-Boxer includes a high-voltage orange cable running to the rear-mounted 12.3 kWh battery under the cargo floor and a secondary inverter coolant reservoir near the front left wheel arch. Pre-2022 units use coolant pump part number 45111AJ010; post-2022 use 45111AJ020 (Subaru SIB 04-21-20).
The e-Boxer 2.0L's primary reliability risk is inverter coolant pump failure in early builds, with elevated incidence in high-mileage urban use. Subaru internal data from 2021 indicated a measurable uptick in hybrid system shutdowns before 80,000 km in pre-2022 units, while UK DVSA MOT records show minimal emissions-related failures due to robust three-way catalyst design. Frequent short trips and infrequent coolant inspection increase pump stress, making adherence to hybrid service intervals critical.
Analysis derived from Subaru technical bulletins (2019–2024) and UK DVSA failure statistics (2020–2025). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about SUBARU E-BOXER-2-0L.
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