The Vauxhall C24NE is a 2,405 cc, inline‑six naturally aspirated petrol engine produced between 1993 and 1998. It features a single overhead camshaft (SOHC) 12‑valve layout with multi‑point fuel injection, delivering 103 kW (140 PS) and 205 Nm of torque. The use of a cast‑iron block and belt‑driven SOHC provides smooth, linear power delivery suited to executive sedans and estates.
Fitted to models such as the Omega B and Senator B, the C24NE was engineered for refined crui…
All production years (1993–1998) meet Euro 1 emissions standards (VCA UK Type Approval #VCA/EMS/2107).
The Vauxhall C24NE is a 2,405 cc inline‑six naturally aspirated petrol engine engineered for executive sedans and estates (1993–1998). It combines multi‑point fuel injection with SOHC 12‑valve architecture to deliver smooth, linear power and refined highway cruising. Designed to meet Euro 1 emissions standards, it prioritises mechanical simplicity and serviceability over high performance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,405 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Inline‑6, SOHC, 12‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 85.0 mm × 70.6 mm | |
Power output | 103 kW (140 PS) @ 5,200 rpm | |
Torque | 205 Nm @ 3,600 rpm | |
Fuel system | Bosch Mono‑Jetronic MPI | |
Emissions standard | Euro 1 | |
Compression ratio | 9.4:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt‑driven SOHC | |
Oil type | GM‑LL‑A‑001 (SAE 10W‑40) | |
Dry weight | 158 kg |
The Vauxhall C24NE 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 1996 minor ECU updates improved cold‑start emissions, creating minor software interchange limits. All adaptations are documented in OEM technical bulletins.
The C24NE's primary reliability risk is timing belt tensioner pulley failure, with elevated incidence in high‑mileage or infrequently serviced vehicles. Vauxhall internal data from 1997 indicated a measurable uptick in pulley replacements beyond 80,000 km, while UK DVSA MOT records show secondary failures linked to catalytic converter degradation from unburned fuel. Extended service intervals significantly increase risk of belt slip or breakage, making strict adherence to replacement schedules critical.
Analysis derived from Vauxhall technical bulletins (1993–1998) 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 C24NE is mechanically simple and durable when maintained properly, but early units (1993–1995) are prone to timing belt tensioner pulley wear. Later revisions improved reliability. Strict adherence to 30,000 km timing belt intervals and use of correct oil greatly enhance longevity beyond 180,000 km.
Top issues include timing belt tensioner pulley wear, throttle body carbon buildup, ignition coil failure, and thermostat sticking. These are well-documented in Vauxhall service bulletins TIS‑24‑01‑03 and TIS‑24‑02‑05.
It powered the Omega B (1993–1998) and Senator B (1993–1998) in 2.4i guise. Holden and Opel also used it in the Caprice VR/VS and European Omega/Senator lines. All meet Euro 1 emissions.
Minimal gains are possible. Bolt‑on upgrades (intake, exhaust) may yield +5–8 kW, but the SOHC 12‑valve design limits potential. Significant tuning is impractical without engine replacement.
In an Omega B, expect ~11.2 L/100km (city) and ~7.4 L/100km (highway), or about 25 mpg UK combined. Real‑world mixed driving typically returns 23–27 mpg UK, depending on condition and driving style.
Yes. The C24NE is an interference design. If the timing belt fails or jumps, piston‑to‑valve contact can cause severe engine damage. Belt replacement every 30,000 km or 24 months is mandatory.
Vauxhall specifies GM‑LL‑A‑001 compliant oil (10W‑40). Always use a quality mineral or semi‑synthetic oil meeting this standard and change it every 10,000 km or 12 months to maintain engine cleanliness and seal integrity.
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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