The Vauxhall Z24XE is a 2,405 cc, inline‑four naturally aspirated petrol engine produced between 2000 and 2005. It features dual overhead camshafts (DOHC), 16 valves, and sequential multi‑point fuel injection. In standard form it delivered 103 kW (140 PS) at 5,200 rpm and 220 Nm of torque at 4,000 rpm, providing smooth and linear power delivery suited to mid‑size applications.
Fitted to models such as the Vectra B, Signum, and early Zafira A, the Z24XE was engineered for re…
All production years (2000–2005) meet Euro 3 standards .
The Vauxhall Z24XE is a 2,405 cc inline‑four naturally aspirated petrol engine engineered for mid‑size family vehicles (2000–2005). It combines DOHC architecture with sequential multi‑point fuel injection to deliver smooth power and strong mid‑range torque. Designed to meet Euro 3 emissions standards, it balances drivability with moderate fuel consumption.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,405 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 87.5 mm × 99.5 mm | |
Power output | 103 kW (140 PS) @ 5,200 rpm | |
Torque | 220 Nm @ 4,000 rpm | |
Fuel system | Sequential multi‑point injection (Bosch Motronic M7.9.7) | |
Emissions standard | Euro 3 | |
Compression ratio | 10.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain (front‑mounted, maintenance‑free design) | |
Oil type | GM‑LL‑A‑025 (SAE 10W‑40 or 5W‑40) | |
Dry weight | 152 kg |
The Vauxhall Z24XE was used across Vauxhall's Vectra B and Signum platforms with longitudinal mounting and shared with Opel under GM’s global ECOTEC strategy. This engine received platform-specific adaptations—reinforced engine mounts in the Zafira A and revised intake manifolds in the Signum—and from 2003 the Z22XE direct-injection successor introduced aluminium-silicon block changes, creating interchange limits. All adaptations are documented in OEM technical bulletins.
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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 Z24XE offers smooth performance but has a known risk of cylinder head cracking if overheated. Early models (2000–2002) are more susceptible; later units saw minor casting improvements. With strict cooling system maintenance and timely oil changes using GM‑LL‑A‑025 oil, many engines exceed 200,000 km reliably.
Top issues include cylinder head cracking between exhaust valves, ignition coil pack failures, oil sludge from infrequent changes, and plastic thermostat housing leaks. These are documented in Vauxhall TSB‑01‑04‑09 and recurring MOT advisories related to cooling system integrity.
The Z24XE powered the Vectra B (2000–2002), Signum (2003–2005), and Zafira A (2001–2005) in 2.4i variants. It was also used in Opel equivalents (Vectra, Signum, Zafira) across Europe under GM’s shared ECOTEC platform.
Aftermarket ECU tuning is common on the Z-24-XE 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 B 2.4i, expect ~10.2 L/100km (city), ~6.5 L/100km (highway), or ~28 mpg UK combined. Real-world mixed driving typically yields 26–30 mpg UK. Economy suffers if ignition or fuel trims are out of calibration.
Yes. The Z24XE is an interference engine. If the timing chain fails (rare but possible), pistons can contact open valves, causing catastrophic damage. However, the chain is robust and designed to last the engine’s lifetime with proper oil maintenance.
Vauxhall specifies SAE 10W‑40 or 5W‑40 synthetic oil meeting GM‑LL‑A‑025 standard. Always use a quality ACEA A3/B4‑compliant oil and change every 10,000 km or 12 months to prevent sludge and ensure valve train protection.
Comprehensive technical documentation and regulatory references
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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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