The Vauxhall A20NFT is a 1,995 cc, inline‑four turbocharged diesel engine produced between 2017 and 2022. It features dual overhead camshafts (DOHC), 16 valves, and high-pressure common‑rail direct fuel injection with a variable geometry turbocharger. In standard form it delivered 132 kW (180 PS) at 3,750 rpm with 400 Nm of torque at 1,750 rpm, offering strong low‑end pull for mid‑size SUVs and estates.
Fitted to models such as the Insignia B and Grandland X, the A20NFT was engineered for Euro 6d‑TEMP emissions compliance through advanced aftertreatment including a diesel oxidation catalyst (DOC), diesel particulate filter (DPF), and selective catalytic reduction (SCR) with AdBlue injection. This allowed the engine to meet stringent urban NOx limits while maintaining drivability and fuel efficiency.
One documented concern is premature failure of the high-pressure fuel pump, particularly in vehicles subjected to frequent short trips that prevent full DPF regeneration cycles. This issue, highlighted in Vauxhall Technical Service Bulletin TSB‑18‑09‑22, stems from fuel contamination and lubricity loss in low-temperature operating conditions. From 2019 onward, revised pump calibration and updated fuel filtration were introduced to reduce failure rates.
All production years 2017–2022 meet Euro 6d-TEMP emissions standards (VCA UK Type Approval #VCA/EMS/2017/1458).
The Vauxhall A20NFT is a 1,995 cc inline‑four turbocharged diesel engineered for mid‑size SUVs and estates (2017–2022). It combines DOHC 16‑valve architecture with common‑rail direct injection and a variable geometry turbocharger to deliver strong low‑rpm torque and smooth power delivery. Designed to meet Euro 6d-TEMP emissions standards, it integrates SCR/AdBlue and DPF systems for compliance in urban and highway driving.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,995 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 86.0 mm × 85.8 mm | |
| Power output | 132 kW (180 PS) @ 3,750 rpm | |
| Torque | 400 Nm @ 1,750 rpm | |
| Fuel system | Bosch CP4.2 common‑rail (up to 2,500 bar) | |
| Emissions standard | Euro 6d-TEMP | |
| Compression ratio | 16.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single variable geometry turbo (Honeywell VNT) | |
| Timing system | Chain (front‑mounted, maintenance‑free design) | |
| Oil type | Vauxhall GM‑LL‑B‑025 (SAE 5W‑30) | |
| Dry weight | 158 kg |
The variable geometry turbo provides responsive torque across the rev range but requires consistent long-distance driving to maintain DPF and SCR system health. Vauxhall GM‑LL‑B‑025 oil (5W‑30) is essential due to its low-SAPS formulation for Euro 6 aftertreatment compatibility. The Bosch CP4.2 pump is highly sensitive to fuel quality—only EN 590 ultra-low-sulfur diesel should be used. Pre-2019 units are at higher risk of fuel pump failure; updated filtration and pump calibration from 2019 (per TSB 18‑09‑22) improve reliability. AdBlue consumption averages 1.5–2.0 L per 1,000 km and must never be allowed to run dry.
Oil Specs: Requires Vauxhall GM‑LL‑B‑025 specification (Vauxhall TSB 18‑09‑22). Equivalent to ACEA C2/C3.
Emissions: Euro 6d-TEMP certification applies to all A20NFT production years (VCA Type Approval #VCA/EMS/2017/1458). No Euro 6c or Euro 6d variants exist.
Power Ratings: Measured under ISO 1585 standards. Power output consistent across all applications (Vauxhall TIS Doc. VTIS‑A5210).
Vauxhall Technical Information System (TIS): Docs VTIS‑A5210, VTIS‑A5215
Vauxhall Technical Service Bulletin TSB 18‑09‑22
VCA Type Approval Database (VCA/EMS/2017/1458)
ISO 1585: Road vehicles — Engine test code
The Vauxhall A20NFT was used across Vauxhall's Insignia B and Grandland X platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—reinforced engine mounts in the Grandland X SUV and unique exhaust routing in the Insignia Sports Tourer—and from 2019 the updated Insignia B LCI models retained the same engine but with revised fuel pump calibration, creating minor ECU differences. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front left side of the cylinder block near the timing cover (Vauxhall TIS VTIS‑A5210). The 8th digit of the VIN indicates engine type ('N' for A20NFT). Pre-2019 models use silver cam covers with black intake manifolds; post-2019 Insignia/Grandland models feature black cam covers and updated AdBlue dosing units. Critical differentiation from A20NHT: A20NFT is 180 PS with SCR/AdBlue; A20NHT is 136 PS without SCR. ECU part numbers differ—A20NFT uses Bosch EDC17C74. Service parts for fuel pumps changed in 2019 per TSB 18‑09‑22.
The A20NFT's primary reliability risk is high-pressure fuel pump failure, with elevated incidence in vehicles used primarily for short urban journeys. Vauxhall internal service data from 2021 indicated a measurable increase in pump replacements in engines with over 60,000 km and fewer than 20 long-distance trips per year, while UK DVSA MOT records show elevated emissions failures in Insignia/Grandland 2.0 CDTi models with neglected AdBlue or DPF maintenance. Short-trip driving prevents full regeneration cycles, accelerating fuel system wear and aftertreatment clogging.
Analysis derived from Vauxhall technical bulletins (2018–2022) and UK DVSA failure statistics (2020–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VAUXHALL A20NFT.
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