The Vauxhall A16XHT is a 1,598 cc, inline‑four turbo‑diesel engine produced between 2013 and 2018. It features common rail direct injection, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC). In standard form it delivers 95 kW (130 PS) and 300 Nm of torque, with strong low — rpm pull for responsive everyday drivability.
Fitted to models such as the Astra J, Insignia B, and Mokka X—including the 1.6 CDTi variants—the A16XHT was engineered for fuel —…
Production years 2013–2014 meet Euro 5 standards; 2015–2018 models comply with Euro 6 depending on market (VCA UK Type Approval #VCA/EMS/5678).
The Vauxhall A16XHT is a 1,598 cc inline‑four turbo‑diesel engineered for compact and mid‑size models (2013–2018). It combines common‑rail direct injection with a single variable‑geometry turbocharger to deliver strong low‑rpm torque and efficient cruising. Designed to meet Euro 5 and Euro 6 standards, it balances everyday performance with economy.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,598 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 79.7 mm × 80.1 mm | |
Power output | 95 kW (130 PS) | |
Torque | 300 Nm @ 1,750–2,500 rpm | |
Fuel system | Bosch CP4.2 common‑rail (up to 1,800 bar) | |
Emissions standard | Euro 5 (2013–2014); Euro 6 (2015–2018) | |
Compression ratio | 16.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable‑geometry turbo (Honeywell) | |
Timing system | Chain (front‑mounted) | |
Oil type | GM Dexos2 (SAE 5W‑30) | |
Dry weight | 138 kg |
The Vauxhall A16XHT was used across Vauxhall's Astra J, Insignia B, and Mokka X platforms with transverse mounting and co-developed with PSA (Peugeot/Citroën) under the joint Euro 6 diesel program. This engine received platform-specific adaptations—revised engine mounts in the Insignia and modified intake manifolds in the Mokka X—and from 2015 the updated HPFP and EGR cooler design improved reliability, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The A16XHT's primary reliability risk is high-pressure fuel pump (HPFP) failure on early builds, with elevated incidence in vehicles using non-EN 590 diesel or exceeding service intervals. Vauxhall internal data from 2016 indicated a notable share of pre-2015 engines requiring HPFP replacement before 100,000 km, while UK DVSA records show increased DPF-related MOT failures in urban-driven examples. Short-trip cycles and poor fuel quality accelerate wear, making fuel specification and oil interval adherence critical.
Analysis derived from Vauxhall technical bulletins (2014–2018) and UK DVSA failure statistics (2016–2023). 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 A16XHT offers good efficiency and torque, but early models (2013–2014) are prone to HPFP failures. Post-2015 revisions improved fuel system durability. With strict adherence to Dexos2 oil, EN 590 diesel, and timely servicing, later examples can be dependable beyond 150,000 km.
Top issues include high-pressure fuel pump wear, DPF regeneration failures from short trips, EGR cooler clogging/leaks, and turbo actuator sticking. These are documented in Vauxhall service bulletins and DVSA MOT data, especially for urban-driven vehicles.
The A16XHT powered the Astra J (1.6 CDTi), Insignia B (1.6 CDTi), and Mokka X (1.6 CDTi) from 2013–2018. It was also used in Opel Astra K and shared with PSA under co-development. All are Euro 5 or Euro 6 compliant depending on year.
Yes. Stage 1 ECU remaps typically yield +15–25 kW safely, as the turbo and internals tolerate moderate torque increases. However, HPFP and DPF reliability may suffer without supporting upgrades. Tuning is not recommended on pre-2015 engines without HPFP replacement.
In an Astra J 1.6 CDTi, expect ~4.8 L/100km combined (59 mpg UK). City driving yields ~5.8 L/100km, highway ~4.1 L/100km. Real-world economy depends heavily on driving style and DPF regeneration frequency—short trips reduce efficiency.
Yes. The A16XHT is an interference engine. If the timing chain fails or jumps, piston-to-valve contact can cause catastrophic damage. While chain failures are rare, any unusual noises should be investigated immediately.
Vauxhall specifies GM Dexos2 5W-30 synthetic oil. This is critical for HPFP lubrication and DPF protection. Never use non-Dexos2 oils, as incorrect additives can accelerate pump wear or cause DPF clogging.
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
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