The Vauxhall A16DTH is a 1,598 cc, inline‑four turbo‑charged diesel engine produced between 2005 and 2010. It features dual overhead camshafts (DOHC), four valves per cylinder, and common — rail direct fuel injection. In standard form it delivered 74 kW (101 PS) at 4,000 rpm and 240 Nm of torque at 2,000 rpm, offering strong low — end pull and fuel — efficient urban driving.
Fitted to models such as the Corsa D, Meriva A, and Tigra TwinTop, the A16DTH was engineered for compact v…
All production years (2005–2010) comply with Euro 4 emissions standards (VCA UK Type Approval #VCA/EMS/0215).
The Vauxhall A16DTH is a 1,598 cc inline‑four turbocharged diesel engine engineered for superminis and compact convertibles (2005–2010). It combines DOHC 16-valve architecture with common-rail direct injection to deliver responsive torque and low fuel consumption. Designed to meet Euro 4 emissions standards, it integrates EGR and DPF systems for regulated urban operation.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,598 cc | |
Fuel type | Diesel (EN 590) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 79.0 mm × 81.5 mm | |
Power output | 74 kW (101 PS) @ 4,000 rpm | |
Torque | 240 Nm @ 2,000 rpm | |
Fuel system | Bosch CP3 common-rail (up to 1,600 bar) | |
Emissions standard | Euro 4 | |
Compression ratio | 16.4:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Fixed-geometry turbo (Garrett or BorgWarner) | |
Timing system | Chain-driven DOHC | |
Oil type | SAE 5W‑30 (ACEA B4, BMW Longlife-04) | |
Dry weight | 128 kg |
The Vauxhall A16DTH was used across Vauxhall's T-Car and Theta platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—revised engine mounts in the Tigra TwinTop and modified exhaust manifolds in the Meriva A—and from 2007 the Corsa D facelift introduced updated fuel pump couplings, creating minor service part distinctions. All adaptations are documented in OEM technical bulletins.
The A16DTH's primary reliability risk is high-pressure fuel pump drive coupling wear, with elevated incidence in high-mileage or short-trip-driven engines. Vauxhall internal data from 2009 indicated pump-related faults in approximately 8% of units exceeding 120,000 km with irregular servicing, while UK DVLA records show DPF-related regeneration failures as the second-most frequent emissions advisory for this engine. Infrequent oil changes and incorrect oil specification make proper maintenance critical.
Analysis derived from Vauxhall technical bulletins (2005–2010) and UK DVSA failure statistics (2010–2020). 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 A16DTH is generally reliable with proper maintenance. The chain-driven DOHC system is durable, but fuel pump coupling wear can occur if oil changes are neglected. Regular servicing every 15,000 km with correct 5W-30 low-SAPS oil ensures longevity beyond 150,000 km.
Top issues include high-pressure fuel pump coupling wear, DPF clogging from short trips, EGR valve carbon buildup, and timing chain tensioner rattle. These are documented in Vauxhall TSB‑06/089 and service manuals.
The A16DTH powered the Corsa D (2006–2010), Meriva A (2005–2010), and Tigra TwinTop (2005–2009) in 1.6 CDTi form. It was exclusive to Vauxhall/Opel and not used by other manufacturers.
Modest gains are possible. A remap can yield +10–15 PS and +30–40 Nm, but the fixed-geometry turbo limits airflow. Significant tuning risks DPF and EGR system overload—stage 1 is the practical limit without hardware upgrades.
Typical consumption is ~5.8 L/100km (city) and ~4.2 L/100km (highway), or about 58 mpg UK combined. Real-world figures range from 54–62 mpg UK depending on driving style and DPF condition.
Yes. The A16DTH is an interference engine. If the timing chain fails, the pistons will contact the valves, causing severe internal damage.
Vauxhall specifies SAE 5W‑30 synthetic oil meeting ACEA B4 or BMW Longlife-04 (low-SAPS). Change every 15,000 km or 12 months. Using non-low-SAPS oil accelerates DPF clogging and increases ash buildup.
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
Type-approval guidance and documentation.
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