The Honda J25A is a 2,495 cc, 60 — degree V6 naturally aspirated petrol engine produced between 2005 and 2008. It features a single overhead camshaft (SOHC) per bank valvetrain and Honda's VTEC system, engineered for smooth power delivery in mid — size applications. Peak output is 162 kW (220 PS) at 6,200 rpm and 247 Nm of torque at 5,000 rpm, providing refined performance ideal for touring.
Fitted primarily to the North American and European — market Honda Accord (CL7, CU2 cha…
Honda
Production years 2005–2008 meet Euro 4 standards .
The Honda J25A is a 2,495 cc 60-degree V6 naturally aspirated petrol engine engineered for mid-size sedans (2005-2008). It combines SOHC architecture with Honda's VTEC system to deliver smooth, linear power delivery. Designed to meet Euro 4 standards, it prioritizes refinement and drivability while maintaining emissions compliance for its era.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,495 cc | |
Fuel type | Petrol | |
Configuration | V6, SOHC, 24-valve | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 86.0 mm × 71.6 mm | |
Power output | 162 kW (220 PS) @ 6,200 rpm | |
Torque | 247 Nm @ 5,000 rpm | |
Fuel system | PGM-FI (Programmed Fuel Injection) | |
Emissions standard | Euro 4 | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 165 kg |
The Honda J25A was used across Honda's CL/CU platforms with transverse mounting. This engine received platform-specific adaptations-reinforced engine mounts in the TSX-and featured a unique intake manifold for the Accord V6 trim. All adaptations are documented in OEM technical bulletins.
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The J25A's primary reliability risk is VTEC oil pressure switch failure, with elevated incidence in vehicles with neglected oil changes. Honda SIB 06-041 identifies the switch as a common failure point, while timing chain tensioner wear remains a secondary risk for high-mileage engines. Extended oil intervals and use of incorrect viscosity make VTEC component longevity and timing chain 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 J25A is generally very reliable if maintained correctly. Its main concern is the VTEC oil pressure switch, with timing chain tensioner wear becoming a factor in high-mileage examples. With regular oil changes using the correct specification, these engines can easily surpass 200,000 km. Neglecting maintenance is the primary cause of major failures.
The most common issues are VTEC oil pressure switch failure (causing P1259 code), timing chain tensioner wear causing rattling noises, VTC actuator failure leading to rough idle, and excessive oil consumption due to piston ring wear in some high-mileage engines.
The J25A was used in the seventh-generation Honda Accord (chassis codes CL7, CU2) for North American and European markets from 2005 to 2008, as well as the Acura TSX (chassis code CL9) from 2006 to 2008.
Yes, the J25A can be tuned. Basic modifications like an induction kit and exhaust can yield small gains. More significant power increases come from ECU remapping and performance cams. Its robust V6 design can handle moderate power increases, but supporting modifications are recommended for reliability.
Fuel economy is respectable for a 2.5L V6. Expect around 10.5 L/100km (27 mpg UK) in mixed driving for a manual transmission model. Careful highway driving can see figures closer to 8.0 L/100km (35 mpg UK), while aggressive city driving will be higher.
Yes. The J25A is an interference engine. This means if the timing chain jumps teeth, the pistons will collide with the open valves, causing severe and expensive internal engine damage. While the chain itself is robust, tensioner failure can lead to this scenario.
Honda recommends 5W-20 or 5W-30 engine oil meeting their specifications. Using a high-quality synthetic oil is highly recommended, especially for the VTEC and VTC systems. Oil should be changed every 10,000 km or 6 months to ensure all systems operate 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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