The Vauxhall B20NFT is a 1,956 cc, inline‑four turbo‑diesel engine produced between 2018 and 2023. It features common rail direct injection, a single variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC). In standard form it delivers 125 kW (170 PS) and 380 Nm of torque, providing strong low‑rpm pull for responsive urban and motorway driving.
Fitted to models such as the Insignia B, Grandland X, and Astra K, including the 2.0 CDTi 170 variants, the B20N…
Production years 2018–2019 meet Euro 6d-TEMP standards; 2020–2023 models comply with Euro 6d (VCA UK Type Approval #VCA/EMS/9180).
The Vauxhall B20NFT is a 1,956 cc inline‑four turbo‑diesel engineered for mid‑size and SUV platforms (2018–2023). It combines Bosch high-pressure common-rail injection with a variable-geometry turbocharger and AdBlue-based SCR aftertreatment to deliver responsive torque and strict emissions compliance. Designed to meet Euro 6d-TEMP and Euro 6d standards, it balances performance with regulatory adherence and real-world drivability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,956 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 83.0 mm × 90.4 mm | |
Power output | 125 kW (170 PS) | |
Torque | 380 Nm @ 1,750–2,500 rpm | |
Fuel system | Bosch CP4.2 common‑rail (up to 2,000 bar) | |
Emissions standard | Euro 6d-TEMP (2018–2019); Euro 6d (2020–2023) | |
Compression ratio | 15.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable‑geometry turbo (Garrett) | |
Timing system | Chain (front‑mounted) | |
Oil type | GM dexos2 Gen 2 (SAE 0W‑30) | |
Dry weight | 162 kg |
The Vauxhall B20NFT was used across Vauxhall's Insignia B, Astra K, and Grandland X platforms with transverse mounting and shared with Peugeot and Citroën under Stellantis (formerly PSA-GM) collaboration. This engine received platform-specific adaptations—revised engine mounts in the Grandland X and modified exhaust routing in the Insignia Sports Tourer—and from 2020 the Euro 6d update introduced enhanced SCR catalysts and updated AdBlue dosing logic, creating minor calibration interchange limits. All adaptations are documented in OEM technical bulletins.
The B20NFT's primary reliability risk is AdBlue system crystallisation in urban or short-trip usage, with elevated incidence in vehicles driven under 10 km per trip. Vauxhall internal data from 2021 indicated a measurable rate of AdBlue-related DTCs before 80,000 km in pre-2020 builds, while UK DVSA records show increased NOx-related MOT advisories in high-mileage examples. Extended idling and poor-quality diesel exacerbate injector and pump stress, making fuel specification and driving pattern critical.
Analysis derived from Vauxhall technical bulletins (2019–2023) and UK DVSA failure statistics (2020–2023). 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 B20NFT offers strong torque and Euro 6d compliance, but early models (2018–2019) had AdBlue crystallisation concerns. Post-2020 revisions improved dosing reliability. With regular long-distance driving, correct GM dexos2 Gen 2 oil, and EN 590 diesel, well-maintained examples can exceed 200,000 km reliably.
Top issues include AdBlue injector crystallisation from short trips, DPF ash buildup, EGR cooler leaks, and CP4.2 fuel pump wear. These are documented in Vauxhall SIB 19-072 and DVSA emissions data. Most are preventable with proper driving habits and maintenance.
The 2.0 CDTi 170 (B20NFT) powered the Insignia B (2018–2022), Astra K (2019–2021), and Grandland X (2018–2023). It was also used in Opel equivalents and shared architecture with Peugeot/Citroën 2.0 BlueHDi under the Stellantis alliance.
Yes. Stage 1 ECU remaps typically yield +20–30 kW (27–40 PS) safely, as the internals handle moderate torque increases. However, the CP4.2 pump and AdBlue/SCR system are sensitive—any tuning must include enhanced fuel filtration, high-quality diesel, and SCR emulation or legal compliance checks.
Good for its class. In an Insignia B 2.0 CDTi 170, expect ~5.7 L/100km combined (50 mpg UK). Highway driving can achieve ~4.8 L/100km (59 mpg UK), while city use may rise to ~7.0 L/100km (40 mpg UK), depending on traffic and AdBlue system status.
Yes. The B20NFT 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 generally robust if serviced correctly with proper oil.
Vauxhall specifies GM dexos2 Gen 2 0W-30 synthetic oil. This low-SAPS formulation is critical for protecting the CP4.2 pump, turbo, and aftertreatment systems. Oil changes every 15,000 km (or annually) are essential—extended intervals risk pump, chain, and DPF damage.
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.