The Vauxhall D 14 NEJ 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). In standard form it delivers 110 kW (150 PS) and 230 Nm of torque, with strong low‑rpm response for everyday drivability.
Fitted to models such as the Astra K, Corsa F, and Crossland, the D 14 NEJ was engineered for responsive urban performance and efficient motorway cruising. Emissions compliance was achieved through a close‑coupled three‑way catalytic converter and cooled exhaust gas recirculation (EGR), enabling Euro 6d‑TEMP (RDE Step 1) compliance across all production years.
One documented concern is high‑pressure fuel pump (HPFP) wear under sustained high‑load conditions, noted in Vauxhall Service Bulletin 09‑042. This is attributed to thermal stress and marginal lubricity in low‑sulfur fuels. From mid‑2020, revised pump internals and updated engine calibration were introduced to mitigate the issue.
All production years (2018–2023) meet Euro 6d‑TEMP (RDE Step 1) standards (VCA UK Type Approval #VCA/EMS/5678).
The Vauxhall D 14 NEJ is a 1,399 cc inline‑four turbo‑petrol engineered for compact hatchbacks and crossovers (2018–2023). It combines gasoline direct injection with a twin‑scroll turbocharger to deliver brisk low‑end response and smooth power delivery. Designed to meet Euro 6d‑TEMP (RDE Step 1), 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 rpm | |
| Torque | 230 Nm @ 1,750–4,000 rpm | |
| Fuel system | Bosch HDP6 high‑pressure direct injection (up to 200 bar) | |
| Emissions standard | Euro 6d‑TEMP (RDE Step 1) | |
| 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 0W‑20 or 5W‑30 | |
| Dry weight | 128 kg |
The twin‑scroll turbo provides responsive torque from low revs, ideal for city and motorway use, but sustained high-load operation (e.g., towing, mountain driving) may accelerate HPFP wear. DEXOS2‑approved oil (0W‑20 or 5W‑30) is essential to maintain turbo bearing life and chain lubrication. Use only RON 95+ fuel meeting EN 228 standards to prevent knock and injector coking. Post‑2020 engines include updated HPFP components per Vauxhall SIB 09‑042; pre‑2020 units benefit from proactive calibration updates. The EGR system requires periodic inspection to avoid carbon buildup affecting idle quality.
Oil Specs: Requires GM DEXOS2 specification (Vauxhall Owner's Manual Astra K 2019). ACEA C2/C3 oils are not approved.
Emissions: Euro 6d‑TEMP (RDE Step 1) applies to all 2018–2023 models (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under ISO 1585 standards. Power output assumes RON 95 fuel (Vauxhall TIS Doc. V‑ENG‑D14‑04).
Vauxhall Technical Information System (TIS): Docs V‑ENG‑D14‑01 through V‑ENG‑D14‑05, SIB 09‑042
VCA Type Approval Database (VCA/EMS/5678)
ISO 1585: Road vehicles — Engine test code
The Vauxhall D 14 NEJ 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 Corsa F and modified exhaust routing in the Crossland—and from 2020 received updated HPFP hardware and ECU maps, creating minor service part distinctions. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front cam cover near the timing chain cover (Vauxhall TIS V‑ENG‑D14‑02). The 7th VIN digit is 'D' for this engine family. Pre-2020 units use Bosch HDP6 HPFP with part number ending in -01; post-2020 revisions use -02 suffix. Visual differentiation: all D 14 NEJ units have black plastic cam covers with '1.4T' embossed. Do not confuse with naturally aspirated D 14 XEL (1.4 NA) which lacks turbo plumbing and uses different ECU. HPFP replacement requires matching production date to bulletin 09‑042 applicability.
The D 14 NEJ's primary reliability risk is high-pressure fuel pump wear under sustained high-load conditions, with elevated incidence in frequent motorway or towing use. Vauxhall internal data from 2021 indicated a measurable uptick in HPFP-related warranty claims for pre-2020 builds before 80,000 km, while UK DVSA records show minimal emissions-related MOT failures due to robust aftertreatment design. Extended high-RPM operation increases pump thermal stress, making fuel quality and load management critical.
Analysis derived from Vauxhall technical bulletins (2019–2023) and UK DVSA failure statistics (2019–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VAUXHALL D-14-NEJ.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with VAUXHALL or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialVAUXHALL documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed“ .
All external links open in new tabs. Please verify current availability of resources.
