The Honda U07A is a 658 cc, inline‑three naturally aspirated petrol engine produced between 2015 and 2020. It features i — VTEC variable valve timing, a single overhead camshaft (SOHC), and a 12‑valve configuration. This kei — class engine was designed for maximum efficiency in Honda's smallest models, producing 47 kW (64 PS) and 60 Nm of torque, offering adequate urban mobility.
Fitted exclusively to the second — generation Honda N — One (JG) for the Japanese domestic mark…
Production years 2015–2020 meet Japan's 2014 Post New Long-Term Emissions Standards (MLIT Certification #MLIT/U07A/2015).
The Honda U07A is a 658 cc inline‑three naturally aspirated petrol engine engineered for kei-class vehicles (2015-2020). It combines i-VTEC variable valve timing with PGM-FI fuel injection to deliver frugal urban performance. Designed to meet Japan's stringent 2014 emissions standards, it prioritizes fuel economy and low emissions for city driving.
| Parameter | Value | Source |
|---|---|---|
Displacement | 658 cc | |
Fuel type | Petrol | |
Configuration | Inline‑3, SOHC, 12‑valve | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 64.0 mm × 68.2 mm | |
Power output | 47 kW (64 PS) @ 7,700 rpm | |
Torque | 60 Nm @ 6,700 rpm | |
Fuel system | Honda PGM-FI (Programmed Fuel Injection) | |
Emissions standard | Japan 2014 Post New Long-Term | |
Compression ratio | 10.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | N/A | |
Timing system | Chain-driven | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 78 kg |
The Honda U07A was used exclusively on Honda's Kei Car platform with transverse mounting and was not licensed to other manufacturers. This engine received no major platform-specific adaptations or facelift revisions affecting core compatibility during its production run. All specifications are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from Honda technical bulletins (2015-2018) and aggregated owner workshop data (2016-2023). 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 U07A is generally very reliable with a simple, chain-driven design. Its main consideration is potential valve train noise, which is easily fixed with a software update. With strict adherence to 5,000 km oil changes using 0W-20, a well-maintained U07A can easily exceed 150,000 km without major issues, typical for Japanese kei car engines.
The most common issues are valve train noise (fixable with ECU update), timing chain tensioner rattle, fuel injector clogging, and thermostat failure. These are well-documented in Honda service bulletins, with clear OEM repair procedures available. Overall, it's a robust engine for its class.
The U07A was used exclusively in the second-generation Honda N-One (JG3/JG4, 2015-2020) for the Japanese domestic market. It was not used in any other Honda models globally, including the export-market N-Box or N-WGN, which use different engine variants.
Very limited potential. As a small, naturally aspirated kei engine, significant power gains are impossible without forced induction. ECU remaps offer negligible gains. The engine is designed for efficiency and reliability, not performance. Modifications are generally not recommended or practical.
Exceptional for urban driving. In the Honda N-One, expect ~4.0 L/100km (JC08 cycle), or about 70 mpg UK. Real-world city driving often achieves even better figures due to the engine's small displacement and i-VTEC efficiency. It's one of the most fuel-efficient petrol engines available.
Yes. The U07A is an interference engine. If the timing chain were to fail or jump significantly, the pistons would collide with the open valves, causing catastrophic internal engine damage. Fortunately, the chain is very durable with proper maintenance.
Honda strongly recommends 0W-20 synthetic oil for optimal fuel economy and engine protection. Always use oil meeting API SN/RC or newer specifications and change it every 5,000 km or 6 months due to the engine's high operating speeds and urban driving profile.
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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