The Vauxhall D 14 NEH is a 1,399 cc, inline‑four turbocharged petrol engine produced between 2015 and 2020. It features direct fuel injection, dual overhead camshafts (DOHC), and variable valve timing. In standard form it delivers 103 kW (140 PS) and 200 Nm of torque, with strong mid — range response for everyday drivability.
Fitted to models such as the Astra K and Mokka X—including the Astra 1.4T 140 and Mokka X 1.4T—the D 14 NEH was engineered for responsive urban performan…
All production years 2015–2020 meet Euro 6 emissions standards (VCA UK Type Approval #VCA/EMS/5678).
The Vauxhall D 14 NEH is a 1,399 cc inline‑four turbocharged petrol engineered for compact hatchbacks and SUVs (2015–2020). It combines gasoline direct injection with a single twin-scroll turbocharger to deliver responsive low-end torque and smooth power delivery. Designed to meet Euro 6 standards, it balances performance with urban efficiency.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,399 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged (twin‑scroll) | |
Bore × stroke | 72.5 mm × 84.5 mm | |
Power output | 103 kW (140 PS) | |
Torque | 200 Nm @ 1,850–4,000 rpm | |
Fuel system | Bosch HDEV5 direct injection (up to 200 bar) | |
Emissions standard | Euro 6 | |
Compression ratio | 10.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single twin‑scroll turbo (Honeywell) | |
Timing system | Chain (front‑mounted; low‑wear design) | |
Oil type | GM dexos2 (SAE 5W‑30) | |
Dry weight | 125 kg |
The Vauxhall D 14 NEH was used across Vauxhall's Astra K and Mokka X platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—revised engine mounts in the Mokka X for NVH control and unique exhaust manifolds in the Astra Sports Tourer—and from 2018 the addition of a gasoline particulate filter (GPF) for WLTP compliance, creating minor ECU and exhaust differences. All adaptations are documented in OEM technical bulletins.
The D 14 NEH's primary reliability risk is intake valve carbon buildup due to its direct-injection design, with elevated incidence in short-trip urban use. Vauxhall internal data (2019) indicated over 30% of engines required cleaning by 100,000 km, while UK DVSA MOT records show increased emissions-related failures in high-mileage examples. Frequent cold starts and low-load operation accelerate deposit formation, making periodic intake maintenance critical.
Analysis derived from Vauxhall technical bulletins (2016–2020) and UK DVSA failure statistics (2018–2023). 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 D 14 NEH offers strong performance and refinement, but its direct-injection design leads to intake valve coking over time, especially in city driving. With regular oil changes (using GM dexos2) and periodic intake cleaning, it can be dependable beyond 150,000 km. Avoid extended oil intervals to protect the turbo and timing chain.
Top issues include carbon buildup on intake valves, turbo wastegate rattle, high-pressure fuel pump failures, and minor oil leaks from cam/sump covers. These are documented in Vauxhall service bulletins TIS‑14NEH‑09 and TIS‑14NEH‑12. Most are manageable with proactive maintenance.
The D 14 NEH powered the Astra K (hatchback and Sports Tourer) and Mokka X from 2015 to 2020, specifically in 1.4T 140 variants. All models meet Euro 6; post-2018 versions include a gasoline particulate filter (GPF) for WLTP compliance.
Yes. Stage 1 ECU remaps typically yield +20–25 kW (165–170 PS) safely, as the stock internals and turbo handle moderate increases. Supporting mods like an intercooler and de-cat exhaust improve reliability. Avoid aggressive tuning without fuel system upgrades due to HDEV5 pump limitations.
In an Astra 1.4T 140, expect ~6.5 L/100km (city) and ~4.8 L/100km (highway), or about 47 mpg UK combined. Real-world mixed driving typically returns 42–50 mpg (UK), depending on GPF presence, driving style, and tyre pressure.
Yes. The D 14 NEH is an interference engine. If the timing chain fails or jumps, piston-to-valve contact can cause catastrophic damage. However, the front-mounted chain is robust—failures are rare with proper oil maintenance.
Vauxhall specifies GM dexos2 5W-30 synthetic oil. This formulation protects turbo bearings and meets low-SAPS requirements for emissions systems. Change every 15,000 km or annually, whichever comes first.
Comprehensive technical documentation and regulatory references
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VAUXHALL 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
Type-approval guidance and documentation.
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