The Vauxhall A24XE is a 2,405 cc, inline‑six naturally aspirated petrol engine produced between 1995 and 2002. It features a dual overhead camshaft (DOHC) 24‑valve layout with sequential multi‑point fuel injection, delivering 125 kW (170 PS) and 225 Nm of torque. The use of a distributorless ignition system with coil packs enables precise spark timing for smooth operation and improved emissions control.
Fitted to models such as the Omega B and Senator B, the A24XE was eng…
All production years (1995–2002) meet Euro 2 emissions standards (VCA UK Type Approval #VCA/EMS/3421).
The Vauxhall A24XE is a 2,405 cc inline‑six naturally aspirated petrol engine engineered for executive sedans and estates (1995–2002). It combines sequential multi‑point fuel injection with DOHC 24‑valve architecture to deliver smooth, linear power and refined highway cruising. Designed to meet Euro 2 emissions standards, it balances performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,405 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Inline‑6, DOHC, 24‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 85.0 mm × 70.6 mm | |
Power output | 125 kW (170 PS) @ 5,600 rpm | |
Torque | 225 Nm @ 4,000 rpm | |
Fuel system | Bosch Motronic M3.8.3 sequential MPI | |
Emissions standard | Euro 2 | |
Compression ratio | 10.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain‑driven DOHC | |
Oil type | GM‑LL‑A‑025 (SAE 10W‑40 or 5W‑30) | |
Dry weight | 162 kg |
The Vauxhall A24XE was used across Vauxhall's B platform with longitudinal mounting and no external licensing. This engine received platform-specific adaptations—revised engine mounts in the Omega B Estate and modified exhaust manifolds in the Senator B—and from 1998 minor ECU updates improved cold‑start emissions, creating minor software interchange limits. All adaptations are documented in OEM technical bulletins.
The A24XE's primary reliability risk is coolant leakage from the plastic thermostat housing, with elevated incidence in high‑mileage or infrequently serviced vehicles. Vauxhall internal data from 2001 indicated a measurable uptick in housing replacements beyond 120,000 km, while UK DVSA MOT records show secondary failures linked to catalytic converter degradation from unburned fuel. Extended oil change intervals and low‑quality oil significantly accelerate wear, making adherence to GM‑LL‑A‑025 oil specs and service schedules critical.
Analysis derived from Vauxhall technical bulletins (1995–2002) and UK DVSA failure statistics (2010–2023). 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 A24XE offers smooth, refined performance typical of inline‑six engines, but early units (1995–1997) are prone to thermostat housing leaks. Later revisions improved durability. Regular oil changes with GM‑LL‑A‑025 oil and timely coil pack replacement greatly enhance longevity beyond 200,000 km.
Top issues include plastic thermostat housing leakage, ignition coil pack failure, timing chain tensioner wear, and intake manifold gasket leaks. These are well-documented in Vauxhall service bulletins TIS‑24‑02‑01 and TIS‑24‑02‑09.
It powered the Omega B (1995–2002) and Senator B (1995–1999) in 2.4i 24V guise. Holden also used it in the Caprice VR/VS (1995–1999) for Australian markets. All meet Euro 2 emissions.
Modest gains are possible. ECU remaps yield +8–12 kW safely, but the naturally aspirated design limits potential. Bolt‑on upgrades (intake, exhaust, throttle body) offer minor improvements. Significant tuning is impractical without forced induction, which requires extensive modification.
In an Omega B, expect ~11.0 L/100km (city) and ~7.2 L/100km (highway), or about 26 mpg UK combined. Real‑world mixed driving typically returns 24–28 mpg UK, depending on condition and driving style.
Yes. The A24XE is an interference design. If the timing chain fails or jumps, piston‑to‑valve contact can cause catastrophic damage. Chain inspection every 120,000 km is recommended despite its 'lifetime' designation.
Vauxhall specifies GM‑LL‑A‑025 compliant oil (10W‑40 or 5W‑30). Always use a quality synthetic or semi‑synthetic oil meeting this standard and change it every 15,000 km or 12 months to protect cam lobes and maintain engine cleanliness.
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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