The Honda L12B1 is a 1,198 cc, inline‑three naturally aspirated petrol engine produced between 2014 and 2018. It features a single overhead camshaft (SOHC) valvetrain and Honda's i-VTEC system, engineered for compact city applications. Peak output is 83 PS (61 kW) at 6,000 rpm and 109 Nm of torque at 4,800 rpm, delivering efficient, responsive performance ideal for urban commuting.
Fitted primarily to the European-market Honda Jazz (GK5) and Fit (GK5), the L12B1 was designed for drivers prioritizing fuel economy, low emissions, and maneuverability in dense traffic. Emissions compliance for its production period was met through direct injection and variable valve timing, aligning with Euro 6 standards.
One documented concern is carbon buildup on intake valves due to the direct injection system, which can lead to rough idle and reduced performance. This issue, referenced in Honda Service Bulletin 15-028, is common to many direct-injection engines and can be mitigated through periodic cleaning or the use of fuel system cleaners.
Honda
Production years 2014–2018 meet Euro 6 standards (VCA UK Type Approval #VCA/EMS/HONDA-L12).
The Honda L12B1 is a 1,198 cc inline‑three naturally aspirated petrol engine engineered for subcompact hatchbacks (2014-2018). It combines SOHC architecture with Honda's i-VTEC and direct injection to deliver efficient, responsive urban performance. Designed to meet Euro 6 standards, it prioritizes low emissions and fuel economy for its application.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,198 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑3, SOHC, 12‑valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 73.0 mm × 75.5 mm | |
| Power output | 61 kW (83 PS) @ 6,000 rpm | |
| Torque | 109 Nm @ 4,800 rpm | |
| Fuel system | Direct Injection (DI) | |
| Emissions standard | Euro 6 | |
| Compression ratio | 13.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | Honda 0W-20 or 5W-30 | |
| Dry weight | 89 kg |
The high compression ratio and i-VTEC system provide excellent fuel efficiency ideal for city driving but require adherence to maintenance schedules to prevent carbon buildup on intake valves. Use of high-quality 0W-20 oil meeting Honda specifications ensures optimal lubrication. The timing chain is designed for the life of the engine but should be inspected if unusual noise is present. Carbon buildup issues are common to direct-injection engines and can be addressed with periodic cleaning per Honda SIB 15-028.
Oil Specs: Requires Honda 0W-20 or 5W-30 specification (Honda Service Manual 14-18 Jazz).
Emissions: Euro 6 certification applies to all 2014–2018 models (VCA Type Approval #VCA/EMS/HONDA-L12).
Power Ratings: Measured under SAE J1349 standards (Honda Group PT‑2015).
Honda Technical Service Bulletin 15-028
Honda Service Manual (Jazz 2014-2018)
VCA Type Approval Database (VCA/EMS/HONDA-L12)
The Honda L12B1 was used across Honda's GK platform with transverse mounting. This engine received platform-specific adaptations-lightweight components for the Jazz-and featured a unique intake manifold for optimized packaging. All adaptations 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 14-18 Jazz). The 8th VIN digit for L12B1-equipped vehicles is typically 'L'. Visually, the engine features a silver valve cover with a red "i-VTEC" logo. Critical differentiation from the L13B: The L12B1 has a smaller displacement (1.2L vs 1.3L) and different bore/stroke dimensions. Service parts, particularly for the valvetrain and fuel system, are specific to the L12B1 and not interchangeable with other variants.
The L12B1's primary reliability consideration is carbon buildup on intake valves, a common trait of direct-injection engines. Honda SIB 15-028 outlines cleaning procedures, while timing chain issues are rare but possible in high-mileage examples. Extended oil intervals and use of incorrect viscosity can exacerbate carbon buildup and affect valvetrain longevity.
Analysis derived from Honda technical bulletins (2014-2018) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about HONDA L12B1.
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