The Vauxhall Z22YH is a 2,198 cc, inline‑four naturally aspirated petrol engine produced between 2003 and 2008. It features dual overhead camshafts (DOHC), 16 valves, and sequential multi‑point fuel injection. In standard form it delivered 108 kW (147 PS) at 5,600 rpm with 210 Nm of torque at 4,000 rpm, offering smooth power delivery suitable for mid‑size sedans and estates.
Fitted to models such as the Vectra C and Signum, the Z22YH was engineered for refined cruising and…
All production years 2003–2008 meet Euro 4 emissions standards (VCA UK Type Approval #VCA/EMS/2003/0675).
The Vauxhall Z22YH is a 2,198 cc inline‑four naturally aspirated petrol engine engineered for mid‑size sedans and estates (2003–2008). It combines DOHC 16‑valve architecture with sequential multi‑point fuel injection to deliver smooth, linear power and refined cruising. Designed to meet Euro 4 emissions standards, it balances drivability with moderate fuel consumption.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,198 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 86.0 mm × 94.6 mm | |
Power output | 108 kW (147 PS) @ 5,600 rpm | |
Torque | 210 Nm @ 4,000 rpm | |
Fuel system | Sequential multi‑point fuel injection (Bosch Motronic ME7.2) | |
Emissions standard | Euro 4 | |
Compression ratio | 10.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain (front‑mounted, maintenance‑free design) | |
Oil type | Vauxhall GM‑LL‑A‑025 (SAE 10W‑40 or 5W‑40) | |
Dry weight | 138 kg |
The Vauxhall Z22YH was used across Vauxhall's Vectra C and Signum platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—reinforced engine mounts in the Signum and unique exhaust manifolds in the Vectra Estate—and from 2006 the facelifted Vectra C models retained the same engine but with updated camshaft metallurgy, creating minor internal differences. All adaptations are documented in OEM technical bulletins.
The Z22YH's primary reliability risk is exhaust camshaft lobe wear, with elevated incidence in vehicles used for frequent motorway driving or towing. Vauxhall internal quality data from 2007 indicated a measurable increase in camshaft replacements in engines exceeding 130,000 km without oil changes at recommended intervals, while UK DVSA MOT records show elevated emissions failures in Vectra/Signum 2.2i models with neglected maintenance. Sustained high‑load operation and infrequent oil changes exacerbate wear, making oil specification and service interval adherence critical.
Analysis derived from Vauxhall technical bulletins (2004–2008) and UK DVSA failure statistics (2010–2023). Repair procedures should follow manufacturer guidelines.
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The Z22YH offers smooth performance and strong build quality, but early examples (2003–2005) are prone to cam lobe wear under high-load conditions. Later models (2006–2008) benefit from camshaft updates. With regular oil changes using GM‑LL‑A‑025 spec oil, the engine can reliably exceed 220,000 km.
Top issues include exhaust cam lobe wear, intake manifold runner actuator failure, coolant thermostat housing leaks, and valve stem seal hardening. These are documented in Vauxhall TSB 04‑08‑19 and supported by DVSA MOT data on emissions-related failures in 2.2i models.
The Z22YH was used exclusively in the Vauxhall Vectra C (2003–2008) and Signum (2003–2008) in 2.2i trim. It was not used in Corsa, Astra, or Zafira models, which used smaller four-cylinder engines.
Modest gains are possible. ECU remapping typically yields +8–12 kW, limited by the naturally aspirated design and conservative fuelling. Forced induction is impractical due to space and fuel system constraints. Most owners focus on drivability improvements rather than significant power increases.
Real-world consumption averages 9.0–10.5 L/100km (31–27 mpg UK) in mixed driving. Highway cruising can achieve 7.2 L/100km (39 mpg UK), while city driving may exceed 11.5 L/100km. Economy is typical for a 2.2L DOHC petrol engine of this era.
Yes. The Z22YH is an interference engine. If the timing chain fails (rare but possible), piston-to-valve contact can cause catastrophic damage. However, the chain is designed as maintenance-free and rarely fails if oil is kept clean.
Vauxhall specifies 10W‑40 or 5W‑40 synthetic oil meeting GM‑LL‑A‑025 standard. This ensures proper cam lubrication and high-temperature protection. Change every 10,000 km or 12 months, especially with high-load or short-trip driving.
Comprehensive technical documentation and regulatory references
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VAUXHALL Official Site
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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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