The Vauxhall Y 20 DTH is a 1,995 cc, inline‑four turbo‑diesel engine produced between 2006 and 2012. It features common‑rail direct injection, a variable‑geometry turbocharger (VGT), and dual overhead camshafts (DOHC). In standard form it delivers 100 kW (136 PS) at 4,000 rpm and 320 Nm of torque at 2,000 rpm, offering strong low‑end response for mid‑size vehicles.
Fitted to models such as the Vectra C and Signum, the Y 20 DTH was engineered for refined performance, fuel ef…
Production years 2006–2008 meet Euro 4 standards; 2009–2012 models meet Euro 5 .
The Vauxhall Y 20 DTH is a 1,995 cc inline‑four turbo‑diesel engineered for executive sedans and MPVs (2006–2012). It combines common‑rail direct injection with a variable‑geometry turbocharger to deliver strong low‑rpm torque and efficient motorway cruising. Designed to meet Euro 4 (early) and Euro 5 (late) standards, it balances performance with emissions control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,995 cc | |
Fuel type | Diesel (EN 590) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged (VGT) | |
Bore × stroke | 83.0 mm × 92.0 mm | |
Power output | 100 kW (136 PS) @ 4,000 rpm | |
Torque | 320 Nm @ 2,000–2,750 rpm | |
Fuel system | Bosch CP3 common‑rail (up to 1,600 bar) | |
Emissions standard | Euro 4 (2006–2008); Euro 5 (2009–2012) | |
Compression ratio | 16.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable‑geometry turbo (BorgWarner) | |
Timing system | Chain (front‑mounted, maintenance‑free design) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 158 kg |
The Vauxhall Y 20 DTH was used across Vauxhall's Vectra C and Signum platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—revised engine mounts in the Signum and modified exhaust routing in the Vectra C—and from 2009 received DPF integration for Euro 5 compliance, creating minor service part distinctions. All adaptations are documented in OEM technical bulletins.
Engine Finders UK Ltd, which operates EngineCode.uk, can pass your enquiry to engine suppliers in the UK. The service is for vehicles in the United Kingdom, with UK delivery or fitting. This is a commercially connected service, and sending an enquiry does not confirm diagnosis or compatibility.
Diagnostic reminder: If a technician has recommended replacing the engine, you can send an enquiry to engine suppliers in the UK. Confirm the diagnosis first: an engine-code record does not diagnose a fault.
Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. 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 Y 20 DTH is generally robust, but early models (2006–2009) had camshaft HPFP drive lobe wear concerns under high-load use. Post-2010 Euro 5 revisions improved camshaft durability significantly. With proper maintenance—using DEXOS2 oil, quality EN 590 diesel, and avoiding excessive short trips—these engines can exceed 200,000 km reliably.
Top issues include camshaft HPFP drive lobe wear (pre-2010), DPF regeneration challenges (Euro 5), EGR valve sticking, and turbo actuator drift. All are documented in Vauxhall service bulletins and repair manuals.
This 2.0L turbo diesel appears in the Vectra C (2006–2012) and Signum (2006–2008), both in the 136 PS variant. It is not used in commercial vehicles or non-Vauxhall GM brands under this code.
Aftermarket ECU tuning is common on the Y-20-DTH platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
In a Vectra 2.0 CDTI 136 PS, expect ~6.4 L/100km (city), ~4.6 L/100km (highway), or ~50 mpg UK combined. Real-world mixed driving typically returns 45–52 mpg UK, depending on conditions and driving style.
Yes. Like all modern DOHC engines, the Y 20 DTH is an interference design. If the timing chain fails (rare but possible), piston-to-valve contact can cause catastrophic damage. However, the chain is designed as maintenance-free for the engine's life under normal conditions.
Vauxhall specifies DEXOS2-approved 5W‑30 synthetic oil. Never use ACEA C2/C3 or non-DEXOS2 oils, as they may not provide adequate protection for the turbo bearings and high-pressure fuel system.
Comprehensive technical documentation and regulatory references
EngineCode.uk is operated by Engine Finders UK Ltd. It provides engine-reference information and an optional commercial enquiry service. It is not an official manufacturer website. Check the record's sources and confirm vehicle-specific details before relying on it for parts, repairs or replacement.
Our editorial standard prioritises relevant manufacturer documentation and official regulatory sources. The sources and verification status for a record should be checked alongside the data.
A statement is not verified merely because a source is listed. Where supporting evidence is missing or conflicting, the record should identify that limitation. Please report unsupported or inconsistent information.
Transparency in gaps
A missing or unverified value does not mean the manufacturer has withheld it. We distinguish information not yet verified, information not available to us, and information explicitly not disclosed by the source.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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.
Records are subject to review and correction. Source links, dates and verification notes should be read with the technical information. Our Editorial and Sourcing Policy explains our standards and review process.
Found an error or missing source? Report a problem with this page. Include the field or statement concerned and a supporting source if available. You can also email corrections@enginecode.uk.
Copyright and permissions
Images and other material may be protected by copyright. Attribution does not by itself grant permission to reuse material. If you believe material on this site infringes your rights, contact copyrights@enginecode.uk with the page URL and details of your claim. We will review the material and take appropriate action.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
Our Privacy Policy explains how Engine Finders UK Ltd uses information from visits, vehicle lookups, enquiries and messages. Our Cookie Policy explains cookies and similar technologies and how to change your choices.
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.
Ownership and commercial services
EngineCode.uk is owned and operated by Engine Finders UK Ltd. Alongside our reference content, we offer an optional replacement-engine enquiry service through Engine Finders and may identify relevant services provided by businesses connected with us. These commercial connections are disclosed. Using an enquiry service is not required to read our reference content.
Engine Finders UK Ltd operates this website. Our optional enquiry service has a commercial purpose. Our Ownership and Commercial Disclosure explains the relationship between the reference website and that service. Participating suppliers pay a fee or subscription to participate on the network and receive quote requests.
Use this record as a starting point for identification. Specifications and vehicle applications may contain errors or omissions. Confirm the exact engine variant and compatibility using vehicle-specific documentation and a qualified supplier or technician.
All external links open in new tabs. Please verify current availability of resources.