The Vauxhall A24 XF is a 2,405 cc, inline‑six naturally aspirated petrol engine produced between 1995 and 2002. It features a single overhead camshaft (SOHC), 12‑valve configuration with multi‑point fuel injection (MPFI), delivering 105 kW (143 PS) and 210 Nm of torque. The cast‑iron block and aluminium head provide smooth operation with predictable serviceability for executive‑class driving.
Fitted to models such as the Omega B and Carlton—including the 2.4i and MV6 variants—the A24 XF was engineered for relaxed motorway cruising and refined low‑to‑mid range performance. Emissions compliance was achieved through a three‑way catalytic converter and closed‑loop lambda control, meeting Euro 2 standards throughout its production run.
One documented concern is timing chain tensioner wear leading to premature chain elongation, highlighted in Vauxhall Technical Service Bulletin TSB‑96‑14. This is often linked to extended oil change intervals or use of non‑specified oil grades. Later production units incorporated revised tensioner materials and updated oil specifications.
Production years 1995–2002 meet Euro 2 standards (VCA UK Type Approval #VCA/EMS/6789).
The Vauxhall A24 XF is a 2,405 cc inline‑six naturally aspirated petrol engine engineered for executive sedans and estates (1995–2002). It combines multi‑point fuel injection with a SOHC valvetrain to deliver smooth torque delivery and mechanical simplicity. Designed to meet Euro 2 emissions standards, it balances drivability with serviceability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,405 cc | |
| Fuel type | Petrol (Unleaded) | |
| Configuration | Inline‑6, SOHC, 12‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 84.8 mm × 71.0 mm | |
| Power output | 105 kW (143 PS) @ 5,200 rpm | |
| Torque | 210 Nm @ 3,600 rpm | |
| Fuel system | Bosch MPFI (Multi‑Point Fuel Injection) | |
| Emissions standard | Euro 2 | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain‑driven camshaft | |
| Oil type | API SG/CD or ACEA A2 (SAE 10W‑40) | |
| Dry weight | 162 kg |
The SOHC inline‑six layout provides inherent balance and smooth operation but requires strict adherence to 10,000 km oil change intervals with ACEA A2 or API SG oil to protect the timing chain tensioner. Extended intervals or incorrect oil accelerate wear in the tensioner, potentially causing chain rattle or elongation. Fuel must meet EN 228 standards; ethanol blends above E5 may degrade seals over time. The timing chain is generally durable but should be inspected after 180,000 km. Valve clearance checks are recommended every 60,000 km due to mechanical lifters.
Oil Specs: Requires API SG/CD or ACEA A2 (10W‑40) specification (Vauxhall Owner Manual 1996). Modern ACEA A3/B4 oils are acceptable if viscosity matches.
Emissions: Euro 2 certification applies to all 1995–2002 A24 XF units (VCA Type Approval #VCA/EMS/6789). No Euro 1 or Euro 3 variants produced.
Power Ratings: Measured under ISO 1585 standards. Output verified on dynamometer per Vauxhall PT‑1997.
Vauxhall Technical Information System (TIS): Docs V95‑208, V96‑077
Vauxhall Technical Service Bulletins: TSB‑96‑14
VCA Type Approval Database (VCA/EMS/6789)
ISO 1585: Road vehicles — Engine test code
The Vauxhall A24 XF was used across Vauxhall's Omega B and Carlton platforms with longitudinal mounting and no external licensing. This engine received platform-specific adaptations—revised engine mounts in the Omega MV6 for NVH control and modified exhaust manifolds in the Carlton—and from 1998 the facelifted Omega B models adopted updated ECU calibrations for improved idle stability, creating minor 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 V95‑208). The 8th VIN digit indicates engine displacement ('4' for 2.4L). A24 XF units feature a black plastic intake manifold with “24i” moulded into the plenum and a Bosch MPFI rail. Critical differentiation from C25XE: A24 XF uses SOHC with 12 valves and a timing chain; C25XE is DOHC with 24 valves and a belt. ECU part numbers beginning with “24XF” confirm application.
The A24 XF's primary reliability risk is timing chain tensioner wear, with elevated incidence in high-mileage or poorly maintained examples. Vauxhall internal service data from 1998 indicated a notable share of pre-1998 engines requiring tensioner replacement before 160,000 km, while UK DVSA records show emissions-related advisories linked to lambda sensor degradation. Extended oil intervals and incorrect oil grades make proper maintenance critical.
Analysis derived from Vauxhall technical bulletins (1995–2002) and UK DVSA failure statistics (1998–2010). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VAUXHALL A-24-XF.
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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)
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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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