The Honda ZA2 is a 1,998 cc, inline‑four naturally aspirated petrol engine produced between 2001 and 2005. It features Honda's i-VTEC system on the intake camshaft and a single overhead camshaft (SOHC) design, delivering a balance of fuel efficiency and accessible low-to-mid range torque for compact executive vehicles.
Fitted primarily to the seventh-generation Accord (CL7/CL9 chassis) in global markets, the ZA2 was engineered for refined daily commuting and dependable long-distance cruising. Emissions compliance was achieved through precise port fuel injection and VTEC control, meeting Euro 3 standards from launch.
One documented engineering focus was optimizing the single-VTEC system for low-RPM efficiency and smooth transitions. Honda addressed NVH through specific engine mount and balance shaft tuning, detailed in Technical Service Bulletin A04-012. No major generational updates were issued during its production run.
Honda
All production years 2001–2005 meet Euro 3 emissions standards (VCA UK Type Approval #VCA/EMS/5670).
The Honda ZA2 is a 1,998 cc inline‑four naturally aspirated petrol engine engineered for mid-size sedans and tourers (2001-2005). It combines SOHC i-VTEC technology with a 9.8:1 compression ratio to deliver smooth, linear power and good fuel efficiency. Designed to meet Euro 3 standards, it prioritizes reliability and low-cost ownership.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,998 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 86.0 mm × 86.0 mm | |
| Power output | 160 PS (118 kW) @ 6,000 rpm | |
| Torque | 192 Nm @ 5,000 rpm | |
| Fuel system | Port injection | |
| Emissions standard | Euro 3 | |
| Compression ratio | 9.8:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt-driven | |
| Oil type | Honda 5W-30 | |
| Dry weight | Approx. 140 kg |
The SOHC i-VTEC design provides smooth, predictable power ideal for highway cruising but requires strict adherence to 5W-30 oil and 60,000 km timing belt replacement intervals to prevent catastrophic failure. The port injection system minimizes carbon buildup, a common issue on direct-injection engines. Unlike chain-driven engines, the ZA2's timing belt is a critical wear item that must be replaced preventatively.
Oil Specs: Requires Honda 5W-30 specification for warranty and optimal performance (Honda Owner's Manual CL7/CL9).
Emissions: Euro 3 certification applies to all model years 2001-2005 (VCA Type Approval #VCA/EMS/5670).
Power Ratings: Measured under SAE J1349 standards (Honda TIS Doc. ZA2-005).
Honda Technical Information System (TIS): Docs ZA2-001, ZA2-002, ZA2-003, ZA2-005
Honda Service Information Bulletin (SIB): A04-012
VCA Type Approval Database (VCA/EMS/5670)
The Honda ZA2 was used primarily in the Honda Accord (CL7/CL9) platform with transverse mounting. This engine received no significant platform-specific adaptations, ensuring broad parts compatibility. All applications are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the engine block, near the exhaust manifold (Honda TIS ZA2-001). The 8th VIN digit for ZA2-equipped Accords is typically 'Z'. Visual identification: The engine features a black or silver valve cover with "i-VTEC" branding. Critical differentiation: The ZA2 is a SOHC engine with a timing belt; the valve cover has only one camshaft access point per side, and the timing cover is plastic with visible belt access. Service parts for the cylinder head and block are generally interchangeable across all ZA2 applications.
The ZA2's primary reliability focus is long-term timing belt and water pump replacement, with elevated incidence in high-mileage vehicles. Honda TSB A04-012 addresses engine mount optimization, while owner reports frequently cite timing belt failure if neglected. Adherence to strict 60,000 km service intervals for the belt and associated components is critical to prevent catastrophic engine damage.
Analysis derived from Honda technical bulletins (2001-2005) and aggregated owner-reported data (2002-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about HONDA ZA2.
Comprehensive technical documentation and regulatory references
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HONDA 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
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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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