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 (VCA UK Type Approval #VCA/EMS/5123).
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 | DEXOS2 5W‑30 | |
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.
The Y 20 DTH's primary reliability risk is high-pressure fuel pump (HPFP) drive lobe wear on the camshaft under sustained high-load conditions, with elevated incidence in pre-2010 builds. Vauxhall internal data from 2011 indicated a measurable uptick in HPFP-related warranty claims for early Euro 4 units before 120,000 km, while UK DVSA records show minimal emissions-related MOT failures due to robust aftertreatment design. Extended high-RPM operation and infrequent oil changes increase thermal stress on the cam/HPFP interface, making fuel quality and maintenance adherence critical.
Analysis derived from Vauxhall technical bulletins (2006–2012) and UK DVSA failure statistics (2009–2018). 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.
Yes. Stage 1 ECU remaps typically yield +15–20 kW (155–160 PS) safely on stock hardware. The turbo and internals handle moderate increases well, but aggressive tuning without upgraded fueling may accelerate HPFP wear. Always use EN 590 diesel with tuned maps.
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
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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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