The Vauxhall B14NET is a 1,399 cc, inline‑four turbocharged petrol engine produced between 2015 and 2021. It features a dual overhead camshaft (DOHC) 16‑valve layout with direct fuel injection and variable valve timing, delivering 103 kW (140 PS) and 200 Nm of torque. The use of a low-inertia turbocharger and high-pressure gasoline direct injection (GDI) enables responsive performance with improved fuel efficiency compared to naturally aspirated predecessors.
Fitted to models such as the Corsa E, Astra K, and Mokka X, the B14NET was engineered for compact hatchbacks and crossovers requiring brisk acceleration and urban efficiency. Emissions compliance was achieved through a three‑way catalytic converter, cooled exhaust gas recirculation (EGR), and precise lambda control, allowing the engine to meet Euro 6 standards across its production run.
One documented concern is carbon buildup on intake valves due to the portless direct injection design, which deprives valves of fuel-washing action. This issue, referenced in Vauxhall Technical Service Bulletin TIS‑14‑07‑03, can lead to rough idle and misfires in high‑mileage or short‑trip applications. From 2018, revised intake geometry and updated ECU maps were introduced to mitigate deposit formation.
All production years (2015–2021) meet Euro 6 emissions standards (VCA UK Type Approval #VCA/EMS/9876).
The Vauxhall B14NET is a 1,399 cc inline‑four turbocharged petrol engine engineered for compact hatchbacks and crossovers (2015–2021). It combines gasoline direct injection with a low-inertia turbocharger to deliver responsive mid-range torque and efficient urban driving. Designed to meet Euro 6 emissions standards, it balances performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,399 cc | |
| Fuel type | Petrol (Unleaded) | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 74.0 mm × 81.3 mm | |
| Power output | 103 kW (140 PS) @ 4,900 rpm | |
| Torque | 200 Nm @ 1,850–4,000 rpm | |
| Fuel system | Bosch HDEV5 gasoline direct injection (up to 200 bar) | |
| Emissions standard | Euro 6 | |
| Compression ratio | 10.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single low-inertia turbo (BorgWarner) | |
| Timing system | Chain‑driven DOHC | |
| Oil type | GM‑LL‑A‑025 (SAE 5W‑30) | |
| Dry weight | 112 kg |
The turbocharged GDI layout provides brisk low-to-mid range response ideal for city and motorway use but requires adherence to 15,000 km or 12‑month oil change intervals using GM‑LL‑A‑025 oil to protect the timing chain and turbo bearings. The portless direct injection system lacks fuel-washing of intake valves, leading to carbon accumulation—especially with frequent short trips. Periodic intake valve cleaning or walnut blasting may be required beyond 80,000 km. Post-2018 models feature revised intake ports and updated ECU maps per TIS‑14‑07‑03 to reduce deposit formation.
Oil Specs: Requires GM‑LL‑A‑025 specification (Vauxhall SIB TIS‑14‑07‑03). ACEA C3 oils are acceptable if GM‑LL‑A‑025 is unavailable.
Emissions: Euro 6 certification applies to all B14NET production (2015–2021) (VCA Type Approval #VCA/EMS/9876). No market variants deviate from this standard.
Power Ratings: Measured under ISO 1585 standards. Power output verified on dynamometer per Vauxhall PT‑2016 test protocol.
Vauxhall Technical Information System (TIS): Docs TIS‑14‑01‑09, TIS‑14‑02‑11, TIS‑14‑07‑03
VCA Type Approval Database (VCA/EMS/9876)
ISO 1585: Road vehicles — Engine test code
The Vauxhall B14NET was used across Vauxhall's K/Small platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—revised engine mounts in the Mokka X and modified exhaust manifolds in the Astra K—and from 2018 minor ECU updates improved cold‑start emissions and valve deposit mitigation, creating minor software interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front face of the cylinder block near the timing cover (Vauxhall TIS TIS‑14‑02‑01). The 8th VIN digit indicates engine displacement ('4' for 1.4L). All B14NET units feature black plastic cam covers with '1.4T' embossed. Critical differentiation from B10XFT: B14NET is turbocharged with direct injection; B10XFT is a 1.0L turbo with port injection. ECU part numbers beginning with '1232456' denote B14NET; post‑2018 models use updated ECU '1232890' with revised valve deposit mitigation maps (Vauxhall SIB TIS‑14‑07‑05).
The B14NET's primary reliability risk is carbon buildup on intake valves, with elevated incidence in urban-driven or short-trip vehicles. Vauxhall internal data from 2019 indicated a measurable uptick in intake cleaning interventions beyond 80,000 km, while UK DVSA MOT records show secondary failures linked to misfire-related emissions faults. Extended oil change intervals and low-quality oil significantly accelerate wear, making adherence to GM‑LL‑A‑025 oil specs and service schedules critical.
Analysis derived from Vauxhall technical bulletins (2015–2021) and UK DVSA failure statistics (2018–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VAUXHALL B-14-NET.
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