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 engineered for refined cruising and linear power delivery in executive sedans and estates. Emissions compliance was achieved through a three‑way catalytic converter and closed-loop lambda control, allowing the engine to meet Euro 2 standards across its production run.
One documented concern is coolant leakage from the plastic thermostat housing, particularly in high‑mileage units. This issue, referenced in Vauxhall Technical Service Bulletin TIS‑24‑02‑01, is attributed to thermal cycling fatigue in the nylon composite housing. From 1998, revised housings with glass‑fiber reinforcement were introduced to mitigate this failure mode.
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 inline‑six layout provides inherent balance and smoothness ideal for executive driving but requires adherence to 15,000 km or 12‑month oil change intervals using GM‑LL‑A‑025 oil to protect the timing chain and valve train. The plastic thermostat housing is prone to cracking with age; replacement with the reinforced 1998+ unit (P/N 90478912) per TIS‑24‑02‑01 is recommended during cooling system service. No turbo or DPF simplifies long‑term ownership, though catalytic converter efficiency must be monitored for emissions compliance.
Oil Specs: Requires GM‑LL‑A‑025 specification (Vauxhall SIB TIS‑24‑02‑01). ACEA A3/B3 oils are acceptable if GM‑LL‑A‑025 is unavailable.
Emissions: Euro 2 certification applies to all A24XE production (1995–2002) (VCA Type Approval #VCA/EMS/3421). No market variants deviate from this standard.
Power Ratings: Measured under ISO 1585 standards. Power output verified on dynamometer per Vauxhall PT‑1996 test protocol.
Vauxhall Technical Information System (TIS): Docs TIS‑24‑01‑03, TIS‑24‑02‑09, TIS‑24‑02‑01
VCA Type Approval Database (VCA/EMS/3421)
ISO 1585: Road vehicles — Engine test code
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.
Locate the engine code stamped on the front face of the cylinder block near the timing cover (Vauxhall TIS TIS‑24‑02‑01). The 8th VIN digit indicates engine displacement ('4' for 2.4L). All A24XE units feature black plastic cam covers with '24V' embossed. Critical differentiation from C25XE: A24XE has 2.4L displacement and inline‑6 layout; C25XE is a V6. ECU part numbers beginning with '1227345' denote A24XE; post‑1998 models use updated ECU '1227890' with revised idle maps (Vauxhall SIB TIS‑24‑04‑03).
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.
Find answers to most commonly asked questions about VAUXHALL A-24-XE.
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
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VCA Certification Portal
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