The Honda F23A1 is a 2,254 cc, inline‑four naturally aspirated petrol engine produced between 1998 and 2002. It features a single overhead camshaft (SOHC) valvetrain and Honda's VTEC system, engineered for refined torque and reliability in mid — size applications. Peak output is 150 PS (110 kW) at 5,700 rpm and 206 Nm of torque at 4,900 rpm, delivering smooth, linear power ideal for touring.
Fitted primarily to the North American and European — market Honda Accord (CG7, CH6…
Honda
Production years 1998–2002 meet Euro 2 standards .
The Honda F23A1 is a 2,254 cc inline‑four naturally aspirated petrol engine engineered for mid-size sedans and coupes (1998-2002). It combines SOHC architecture with Honda's VTEC system to deliver smooth, torque-rich performance. Designed to meet Euro 2 standards, it prioritizes refinement and drivability while maintaining emissions compliance for its era.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,254 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, SOHC, 16‑valve | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 86.0 mm × 97.0 mm | |
Power output | 110 kW (150 PS) @ 5,700 rpm | |
Torque | 206 Nm @ 4,900 rpm | |
Fuel system | PGM-FI (Programmed Fuel Injection) | |
Emissions standard | Euro 2 | |
Compression ratio | 9.3:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt-driven | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 155 kg |
The Honda F23A1 was used across Honda's CG/CH/UA platforms with transverse mounting. This engine received platform-specific adaptations-reinforced engine mounts in the Acura CL-and featured a unique intake manifold for the Accord V6 trim. All adaptations are documented in OEM technical bulletins.
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The F23A1's primary reliability risk is VTEC oil pressure switch failure, with elevated incidence in vehicles with neglected oil changes. Honda SIB 99-056 identifies the switch as a common failure point, while timing belt neglect remains a critical risk for all interference engines. Extended oil intervals and use of incorrect viscosity make VTEC component longevity and timing belt integrity critical.
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 F23A1 is generally very reliable if maintained correctly. Its main Achilles' heel is the VTEC oil pressure switch and the critical timing belt. With regular oil changes using the correct specification and timely belt replacement, these engines can easily surpass 200,000 km. Neglecting these items is the primary cause of major failures.
The most common issues are VTEC oil pressure switch failure (causing P1259 code), timing belt wear leading to potential engine destruction, distributor bearing wear causing oil leaks and misfires, and cracked exhaust manifolds producing a ticking noise.
The F23A1 was used in the sixth-generation Honda Accord (chassis codes CG7, CH6) for North American and European markets, as well as the first-generation Acura CL (chassis code UA2) from 1998 to 2002.
Yes, the F23A1 can be tuned. Basic modifications like an induction kit and exhaust can yield small gains. More significant power increases come from ECU remapping, performance cams, and head work. Its robust bottom end can handle moderate power increases, but supporting modifications are recommended for reliability.
Fuel economy is respectable for a 2.3L engine. Expect around 9.5 L/100km (30 mpg UK) in mixed driving for a manual transmission model. Careful highway driving can see figures closer to 7.5 L/100km (38 mpg UK), while aggressive city driving will be higher.
Yes. The F23A1 is an interference engine. This means if the timing belt breaks or jumps teeth, the pistons will collide with the open valves, causing severe and expensive internal engine damage. This makes adhering to the timing belt replacement schedule absolutely critical.
Honda recommends 5W-30 or 10W-40 engine oil meeting their specifications. Using a high-quality synthetic or semi-synthetic oil is highly recommended, especially for the VTEC system. Oil should be changed every 10,000 km or 6 months to ensure the VTEC mechanism operates reliably.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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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