The Vauxhall D 14 NET is a 1,399 cc, inline‑four turbo‑petrol engine produced between 2018 and 2023. It features direct fuel injection, a single twin‑scroll turbocharger, and dual overhead camshafts (DOHC) with variable valve timing. In standard form it delivers 110 kW (150 PS) and 235 Nm of torque, providing brisk low‑end response for compact hatchbacks and crossovers.
Fitted to models such as the Astra K, Corsa F, and Crossland, the D 14 NET was engineered for responsive…
Production years 2018–2019 meet Euro 6d TEMP standards; 2020–2023 models comply with Euro 6d (VCA UK Type Approval #VCA/EMS/5678).
The Vauxhall D 14 NET is a 1,399 cc inline‑four turbo‑petrol engineered for compact hatchbacks and crossovers (2018–2023). It combines direct injection with a twin‑scroll turbocharger to deliver responsive low‑rpm torque and refined high‑rpm power. Designed to meet Euro 6d TEMP and Euro 6d standards, it balances performance with stringent emissions control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,399 cc | |
Fuel type | Petrol (RON 95 min) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged (twin‑scroll) | |
Bore × stroke | 74.0 mm × 81.3 mm | |
Power output | 110 kW (150 PS) @ 5,000–6,000 rpm | |
Torque | 235 Nm @ 1,750–4,000 rpm | |
Fuel system | Bosch HDP6 high‑pressure direct injection (up to 200 bar) | |
Emissions standard | Euro 6d TEMP (2018–2019); Euro 6d (2020–2023) | |
Compression ratio | 10.0:1 | |
Cooling system | Water‑cooled with electric auxiliary pump | |
Turbocharger | Single twin‑scroll (Honeywell/ Garrett) | |
Timing system | Chain (front‑mounted, maintenance‑free design) | |
Oil type | DEXOS2 5W‑30 (ACEA C3) | |
Dry weight | 128 kg |
The Vauxhall D 14 NET was used across Vauxhall's Astra K, Corsa F, and Crossland platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—revised engine mounts in the Crossland for NVH control and compact exhaust manifolds in the Corsa F—and from 2020 the updated Astra MY21 models adopted revised engine control calibration for GPF management, creating minor ECU interchange limits. All adaptations are documented in OEM technical bulletins.
The D 14 NET's primary reliability risk is high-pressure fuel pump (HPFP) wear in early builds, with elevated incidence in sustained high-load or hot-climate use. Vauxhall internal data from 2021 indicated a measurable uptick in HPFP replacements before 80,000 km for 2018–2019 units, while UK DVSA records show GPF-related warning lights as the second-most common emissions fault in urban-driven examples. Extended oil intervals and low-quality fuel amplify HPFP and turbo stress, making adherence to DEXOS2 oil and RON 95+ fuel critical.
Analysis derived from Vauxhall technical bulletins (2019–2023) and UK DVSA failure statistics (2020–2024). Repair procedures should follow manufacturer guidelines.
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The D 14 NET is generally robust when maintained properly, but early models (2018–2019) had HPFP reliability concerns. Post-2020 revisions improved fuel system durability. Using DEXOS2 5W-30 oil, RON 95+ fuel, and adhering to service intervals greatly enhances longevity.
Top issues include high-pressure fuel pump wear, GPF saturation from short trips, turbo actuator faults, and minor oil consumption via the PCV system. These are documented in Vauxhall service bulletins like PI0917 and supported by DVSA MOT data.
The D 14 NET powers the Astra K (2018–2023), Corsa F (2019–2023), and Crossland (2018–2023) in 150 PS form. Earlier Crossland models used a 1.2 Turbo, but 1.4 Turbo variants exclusively use the D 14 NET. All are transverse-mounted Euro 6d-compliant petrol engines.
Yes. Stage 1 ECU remaps typically yield +20–25 kW (175–180 PS) safely on stock hardware. The turbo and internals handle moderate increases, but HPFP and fuel quality become critical above 180 PS. Always pair tuning with DEXOS2 oil and quality fuel.
In an Astra 1.4 Turbo 150 PS, expect ~7.2 L/100km (city), ~5.1 L/100km (highway), or ~40 mpg UK combined. Real-world mixed driving typically returns 38–44 mpg UK. GPF regeneration cycles can temporarily increase consumption during short trips.
Yes. Like all modern DOHC engines, the D 14 NET is an interference design. If the timing chain fails (rare but possible), piston-to-valve contact can cause catastrophic damage. However, the chain is front-mounted and designed for life-of-engine service under proper maintenance.
Vauxhall specifies DEXOS2 5W-30 (ACEA C3) synthetic oil. This low-SAPS formulation protects the GPF and turbo. Never use DEXOS1 or non-approved oils, as they can accelerate GPF clogging and HPFP wear. Change every 20,000 km or 12 months.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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