The Honda F23Z5 is a 2,254 cc, inline‑four petrol engine produced between 1998 and 2002. It features a single overhead camshaft (SOHC), 16‑valve valvetrain and programmed fuel injection (PGM‑FI). This engine was designed for refined, torquey performance in Honda's premium models, producing 110 kW (150 PS) and 206 Nm of torque, offering smooth and relaxed driving characteristics.
Fitted primarily to the sixth‑generation Honda Accord (CF chassis) and the second‑generation Honda Prelude (BB chassis), the F23Z5 was engineered for comfortable highway cruising and quiet operation. Emissions compliance for its production period was met through its electronic fuel injection and catalytic converter, aligning with Euro 2 standards.
One documented concern involves the exhaust manifold, where thermal cycling can lead to cracking between the runners. This issue, referenced in Honda Service Bulletin 99‑018, is common in engines with high mileage or those subjected to frequent short trips. Later F‑series engines saw revisions to the manifold casting.
Honda
Production years 1998–2002 meet Euro 2 standards as per applicable EU regulations for vehicles of that era (VCA UK Type Approval #VCA/EMS/6791).
The Honda F23Z5 is a 2,254 cc inline‑four petrol engine engineered for premium sedans and coupes (1998-2002). It combines SOHC 16-valve architecture with programmed fuel injection to deliver smooth, torquey performance and refined operation. Designed to meet Euro 2 emissions standards, it prioritizes drivability and low-RPM responsiveness.
| 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 | Programmed Fuel Injection (PGM‑FI) | |
| Emissions standard | Euro 2 | |
| Compression ratio | 9.3:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt-driven | |
| Oil type | API SJ/SL, SAE 5W-30 or 10W-30 | |
| Dry weight | 138 kg |
The SOHC design provides smooth, quiet operation ideal for cruising but offers less high-RPM power than DOHC variants. Strict 100,000 km timing belt replacement is critical to prevent catastrophic engine damage, as it is an interference design. The exhaust manifold is prone to cracking; listen for ticking noises on cold start. Using the specified 5W-30 or 10W-30 oil ensures proper lubrication. Fuel injectors may require cleaning after 120,000 km to maintain optimal fuel trim.
Oil Specs: Requires API SJ/SL specification oil (Honda Owner's Manual, Accord CF 1999). Viscosity grade depends on ambient temperature.
Emissions: Euro 2 certification applies to all 1998-2002 F23Z5 models (VCA Type Approval #VCA/EMS/6791). No market-specific variations for this standard.
Power Ratings: Measured under SAE J1349 standards. Output is consistent across all markets for this model (Honda EPC Doc. H-F23Z5-001).
Honda Workshop Manual (Accord CF, Sections 6, 10, 11)
Honda Owner's Manual (Accord CF, 1999)
VCA Type Approval Database (VCA/EMS/6791)
The Honda F23Z5 was used across Honda's CF platform with transverse mounting. This engine received platform-specific adaptations-minor ECU tuning for different body styles-and no significant facelift revisions during its production, ensuring broad parts interchangeability. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the engine block, just below the cylinder head and behind the alternator (Honda Workshop Manual, Section 6). The 8th VIN digit for F23Z5-equipped Accords is typically 'F'. Visually, it can be identified by its black plastic SOHC valve cover and the distributor mounted at the rear of the cylinder head. Critical differentiation from the F20B2: The F23Z5 has a larger displacement (2.3L vs 2.0L) and a different exhaust manifold casting. Service parts like the timing belt kit are generally compatible across all F23Z5 applications but verify using the EPC.
The F23Z5's primary reliability risk is exhaust manifold cracking due to thermal stress, with elevated incidence in stop-start urban driving. Honda Service Bulletin 99-018 documents this as a common cause of exhaust leaks, while UK DVSA data shows emissions-related faults as a frequent MOT advisory for this generation. Adherence to long highway drives and proactive manifold inspection make preventative maintenance critical.
Analysis derived from Honda technical bulletins (1998-2002) and UK DVSA failure statistics (2010-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about HONDA F23Z5.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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