The Vauxhall Z20LEH is a 1,998 cc, inline‑four turbocharged petrol engine produced between 2005 and 2008. It features a dual‑overhead camshaft (DOHC) layout, variable valve timing (VVT), and a Garrett GT17V turbocharger. In standard form it delivered 174 kW (240 PS) and 320 Nm of torque, enabling strong performance while meeting Euro 4 emissions standards.
Fitted exclusively to the Vectra OPC (VXR in the UK), the Z20LEH was engineered for high‑performance driving with…
Production years 2005–2008 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/5678).
The Vauxhall Z20LEH is a 1,998 cc inline‑four turbocharged petrol engineered for high‑performance mid‑size sedans (2005–2008). It combines DOHC with variable valve timing and a single turbocharger to deliver responsive power and strong mid‑range torque. Designed to meet Euro 4 standards, it balances track‑capable output with daily usability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,998 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 86.0 mm × 86.0 mm | |
Power output | 174 kW (240 PS) @ 5,600 rpm | |
Torque | 320 Nm @ 2,200–4,800 rpm | |
Fuel system | Bosch ME7.8.8 multi‑point sequential injection | |
Emissions standard | Euro 4 | |
Compression ratio | 8.8:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Garrett GT17V (single, wastegate‑controlled) | |
Timing system | Chain (front‑mounted) | |
Oil type | GM Dexos2 (SAE 5W‑30) | |
Dry weight | 168 kg |
The Vauxhall Z20LEH was used exclusively in Vauxhall's Vectra C platform with longitudinal mounting and no cross‑manufacturer licensing. This engine received platform-specific adaptations—reinforced subframe mounts and a high-capacity intercooler—and from 2007 minor ECU updates improved throttle response, though mechanical compatibility remained consistent. All adaptations are documented in OEM technical bulletins.
The Z20LEH's primary reliability risk is inlet manifold cracking on early builds, with elevated incidence in high-load or track use. Vauxhall internal data from 2007 indicated a significant number of pre-2006 manifolds required replacement before 80,000 km, while UK DVSA records show minimal emissions-related failures due to robust catalytic converter design. Aggressive driving and poor-quality fuel increase knock and thermal stress, making fuel grade and service adherence critical.
Analysis derived from Vauxhall technical bulletins (2005-2009) and UK DVSA failure statistics (2015-2023). 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 Z20LEH offers strong performance and is generally robust if maintained properly. Early models (2005–2006) are prone to inlet manifold cracking, but this was resolved in later production. Using high-quality 98 RON fuel and GM Dexos2 oil, plus regular servicing, greatly improves longevity and reliability.
The top issues are inlet manifold cracking, turbo oil seal failure, ignition coil wear, and coolant leaks from the thermostat housing. These are well-documented in Vauxhall service bulletins, especially TSB-05-08-012 for the manifold. Proper maintenance minimizes most risks.
The Z20LEH was used exclusively in the Vauxhall Vectra C OPC (sold as VXR in the UK) from 2005 to 2008. It was not shared with other Vauxhall models or brands, making it a unique high-performance variant of the Z20 family.
Yes. The Z20LEH responds well to ECU remapping, with stage 1 tunes safely delivering +30–40 kW. Stock internals handle up to ~300 PS with supporting mods like a larger intercooler and exhaust. However, the inlet manifold must be upgraded before aggressive tuning to avoid failure.
Real-world consumption is ~11.5 L/100km (city) and ~7.2 L/100km (highway), or about 25 mpg UK combined. Aggressive driving can push this above 13 L/100km. Using 98 RON fuel improves efficiency and protects against knock under load.
Yes. The Z20LEH is an interference engine. If the timing chain fails or jumps, piston-to-valve contact can cause catastrophic damage. However, the chain is robust and rarely fails if oil is changed regularly with correct specification.
Vauxhall specifies GM Dexos2 5W‑30 synthetic oil. This formulation protects turbo bearings and maintains chain lubrication under high temperatures. Oil should be changed every 10,000 km or 12 months, whichever comes first.
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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