The Honda K20A6 is a 1,998 cc, inline‑four petrol engine produced between 2002 and 2006. It features a DOHC 16‑valve i-VTEC design, prioritizing high-revving performance and efficiency for compact sports applications. Output is rated at 118 kW (160 PS) and 190 Nm, delivering a broad, responsive powerband ideal for spirited driving.
Fitted primarily to the seventh-generation Honda Civic (EP/ES) Type R for the Japanese Domestic Market (JDM), the K20A6 was engineered for enthusiasts seeking track-inspired handling and engine response. Emissions compliance was achieved through PGM-FI (Programmed Fuel Injection) and a three-way catalytic converter, meeting Japanese Heisei 12 and equivalent European emissions standards.
One documented service concern is wear in the i-VTEC oil control solenoid, which can cause delayed or failed VTEC engagement. This issue, referenced in Honda Service Bulletin 04-061, is often linked to oil sludge buildup from infrequent changes. Regular oil changes with the specified viscosity are critical for preventative maintenance.
Honda
Production years 2002–2006 meet Japanese Heisei 12 and equivalent European emissions standards (VCA UK Type Approval #VCA/HON/9900).
The Honda K20A6 is a 1,998 cc inline‑four petrol engine engineered for compact sports hatchbacks (2002-2006). It combines DOHC i-VTEC technology with PGM-FI fuel injection to deliver high-RPM power and responsive torque. Designed to meet early 2000s emissions standards, it balances track-focused performance with daily reliability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,998 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve, i-VTEC | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 86.0 mm × 86.0 mm | |
| Power output | 118 kW (160 PS) @ 7,000 rpm | |
| Torque | 190 Nm @ 6,000 rpm | |
| Fuel system | Honda PGM-FI (Multi-point injection) | |
| Emissions standard | Japanese Heisei 12 / European 2000s | |
| Compression ratio | 11.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | API SJ/SL 5W-30 | |
| Dry weight | 149 kg |
The DOHC i-VTEC system provides a thrilling power surge above 6,000 RPM, ideal for performance driving, but requires clean, high-quality 5W-30 oil to ensure reliable solenoid operation. The PGM-FI system is robust but sensitive to fuel quality. The timing chain is generally maintenance-free. However, the i-VTEC oil control solenoid (per Honda SIB 04-061) is susceptible to sludge buildup if oil changes are neglected, leading to VTEC engagement issues. Regular valve clearance checks every 40,000 km are recommended.
Oil Specs: Requires API SJ/SL 5W-30 specification oil (Honda Service Manual). This viscosity is mandatory for proper i-VTEC solenoid function.
Emissions: Certification applies to 2002–2006 models (VCA Type Approval #VCA/HON/9900). Emissions standards varied significantly by market.
Power Ratings: Measured under SAE J1349 standards. Power output is consistent across all model applications (Honda Group PT-2004).
Honda Technical Service Bulletin: 04-061
Honda Electronic Parts Catalogue (EPC): Doc. H-1998-K20
VCA Type Approval Database (VCA/HON/9900)
The Honda K20A6 was used across Honda's EP/ES platform with transverse mounting and was not licensed to other manufacturers. This engine received minor platform-specific adaptations-reinforced engine mounts and a performance-tuned ECU for the Civic Type R-creating no significant service part differences. All specifications are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the engine block, just below the exhaust manifold (Honda Service Manual 02-06 Civic). Visually, the K20A6 can be identified by its DOHC i-VTEC configuration with dual camshafts and red "K20A" valve cover. Critical differentiation from other K20 engines: The K20A6 features a red valve cover and specific Type R intake manifold. Service parts like the cylinder head and ECU are specific to the K20A6 and not interchangeable with standard K20 variants.
The K20A6's primary reliability risk is failure of the i-VTEC oil control solenoid, with elevated incidence in high-mileage or poorly maintained vehicles. Honda service data indicates this is a common cause for i-VTEC system malfunction, while owner reports frequently cite timing chain tensioner wear. Infrequent oil changes and use of incorrect viscosity can accelerate wear on the i-VTEC system, making adherence to the specified maintenance schedule critical.
Analysis derived from Honda technical bulletins (2002-2006) and aggregated JDM owner club failure reports (2006-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about HONDA K20A6.
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