The Vauxhall Y25TD is a 2,464 cc, inline‑five turbo‑diesel engine produced between 2001 and 2006. It features a single overhead camshaft (SOHC), 20‑valve layout with common rail direct injection and a fixed-geometry turbocharger. In standard form it delivered 100 kW (136 PS) and 300 Nm of torque, providing strong low‑rpm pull suitable for estate and commercial applications.
Fitted primarily to the Vectra C and Signum models—including the 2.5 TD and 2.5 CDTi variants—the Y25TD was engineered for torque‑focused drivability and long‑distance refinement. Emissions compliance was achieved through exhaust gas recirculation (EGR) and oxidation catalysts, meeting Euro 3 standards across all production years.
One documented concern is premature failure of the crankshaft position sensor due to heat exposure from the exhaust manifold, highlighted in Vauxhall Technical Service Bulletin TSB 03‑025. The sensor’s location near the turbo downpipe leads to thermal degradation, causing intermittent stalling or no‑start conditions. Later service replacements relocated the sensor or used a heat‑shielded variant.
All production years (2001–2006) meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/5678).
The Vauxhall Y25TD is a 2,464 cc inline‑five turbo‑diesel engineered for mid‑size sedans and estates (2001–2006). It combines Bosch common‑rail injection with a fixed‑geometry turbocharger to deliver robust low‑end torque and highway stability. Designed to meet Euro 3 emissions standards, it balances load‑carrying capability with fuel efficiency.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,464 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑5, SOHC, 20‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 81.5 mm × 94.6 mm | |
| Power output | 100 kW (136 PS) | |
| Torque | 300 Nm @ 1,900 rpm | |
| Fuel system | Bosch CP1 common‑rail (up to 1,350 bar) | |
| Emissions standard | Euro 3 | |
| Compression ratio | 17.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Fixed‑geometry (Garrett GT1749V) | |
| Timing system | Belt‑driven camshaft | |
| Oil type | GM Dexos2 (SAE 5W‑30) | |
| Dry weight | 192 kg |
The inline‑five layout provides smooth power delivery and strong towing torque but requires strict 20,000 km timing belt replacement intervals to prevent catastrophic failure. GM Dexos2 (5W‑30) oil is essential to protect high‑pressure fuel components and reduce soot accumulation. The crankshaft position sensor is prone to heat damage from the turbo downpipe—symptoms include intermittent stalling; replacement with a heat‑shielded unit per TSB 03‑025 is recommended. Use only ultra‑low‑sulfur diesel (EN 590) to prevent CP1 pump wear.
Oil Specs: Requires GM Dexos2 (5W‑30) specification (Vauxhall SIB 02‑018). Supersedes ACEA B4 requirements.
Emissions: Euro 3 certification applies to all Y25TD production (2001–2006) (VCA Type Approval #VCA/EMS/5678). No Euro 4 variants exist.
Power Ratings: Measured under ISO 1585 standards. Output consistent across all model applications (Vauxhall TIS Doc. VEC‑ENG‑025).
Vauxhall Technical Information System (TIS): Docs VEC‑ENG‑025, SIB 03‑025, SIB 02‑018
VCA Type Approval Database (VCA/EMS/5678)
ISO 1585: Road vehicles — Engine test code
The Vauxhall Y25TD was used across Vauxhall's Vectra C and Signum platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—reinforced subframes in the Vectra Estate and revised engine mounts in the Signum—and from 2004 the 2.5 CDTi variant introduced a revised ECU and exhaust manifold, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front timing cover near the crankshaft pulley (Vauxhall TIS VEC‑ENG‑025). The 7th VIN digit is 'Y' for Y25TD engines. Pre-2004 models use a silver Bosch ECU with round diagnostic port; post-2004 CDTi variants feature black Siemens ECU with rectangular port. Critical differentiation from Z25XE petrol engine: Y25TD has visible turbocharger and EGR valve on the exhaust manifold. Timing belt kits are not interchangeable between early and late CDTi revisions due to tensioner redesign (Vauxhall SIB 04‑011).
The Y25TD's primary reliability risk is crankshaft position sensor failure due to thermal stress, with elevated incidence in high-mileage or stop-start urban use. Vauxhall internal data from 2005 indicated over 15% of pre-2004 engines required sensor replacement before 100,000 km, while UK DVSA MOT records show EGR-related smoke failures in 12% of Vectra C diesels from this era. Extended idling and hot underbonnet conditions accelerate sensor degradation, making heat shielding and correct oil specification critical.
Analysis derived from Vauxhall technical bulletins (2002–2006) and UK DVSA failure statistics (2010–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VAUXHALL Y-25-TD.
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)
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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
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VCA Certification Portal
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