The Fiat 312 B6.000 is a 1,368 cc, inline — four petrol engine produced between 2007 and 2014. It belongs to Fiat's FIRE (Fully Integrated Robotised Engine) family, featuring multi — point fuel injection (MPFI), dual overhead camshafts (DOHC), and 16 valves. In standard tune, it delivers 59 kW (80 PS) at 5,500 rpm and 115 Nm of torque at 3,500 rpm, offering a balance of urban efficiency and drivability for compact hatchbacks.
Fitted primarily to the Fiat 500 (Type 312) from 200…
Production years 2007–2010 meet Euro 4 standards; 2011–2014 models may have Euro 5 compliance depending on market (VCA UK Type Approval #VCA/EMS/5685).
The Fiat 312 B6.000 is a 1,368 cc inline-four petrol engine engineered for compact city cars (2007–2014). It combines multi-point fuel injection with DOHC 16-valve architecture to deliver responsive low-to-mid-range performance. Designed to meet Euro 4 (and select Euro 5) emissions standards, it prioritises fuel economy and serviceability in urban environments.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,368 cc | |
Fuel type | Petrol (Unleaded, 95 RON min) | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 76.0 mm × 75.0 mm | |
Power output | 59 kW (80 PS) @ 5,500 rpm | |
Torque | 115 Nm @ 3,500 rpm | |
Fuel system | Multi-point fuel injection (MPFI) | |
Emissions standard | Euro 4 (pre-2011); Euro 5 optional | |
Compression ratio | 10.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Timing belt (interval: 120,000 km or 6 years) | |
Oil type | SAE 5W-30 (API SL/CF, ACEA A1/B1) | |
Dry weight | 98 kg |
The Fiat 312 B6.000 was used across Fiat's 312-series platforms with transverse mounting and shared architecture with Lancia derivatives. This engine received platform-specific adaptations-shorter intake manifolds in the 500 and revised ECU tuning in the Punto Evo-and from 2012 the updated tensioner design improved belt reliability, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The 312 B6.000's primary reliability risk is timing belt tensioner wear, with elevated incidence in hot climates and extended service cycles. Internal Fiat quality reports from 2013 indicated a significant number of pre-2012 engines required premature belt replacement before 100,000 km, while VCA MOT data links a notable share of emissions failures to oxygen sensor degradation in high-mileage units. Infrequent oil changes and poor fuel quality increase valve train and catalytic converter stress, making adherence to service intervals and fuel specifications critical.
Analysis derived from Fiat technical bulletins (2010–2014) and UK DVSA failure statistics (2012–2020). 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 312 B6.000 is generally reliable when maintained properly, but pre-2012 models are susceptible to timing belt tensioner failure if service intervals are exceeded. Later revisions (post-2012) feature improved tensioner durability. Regular oil changes, use of 95 RON+ fuel, and timely belt replacement every 120,000 km or 6 years ensure long-term reliability.
The most documented issues are timing belt tensioner wear, oxygen sensor degradation, thermostat failure, and ignition coil pack faults. These are confirmed in Fiat service bulletins and field reports. Carbon buildup is minimal due to MPFI design, but sensor and belt maintenance is critical to avoid unexpected breakdowns.
This 1.4L petrol engine was used in the Fiat 500 (2007–2014) and Punto Evo (2007–2014). It was also shared with the Lancia Ypsilon (2008–2011). All models are Euro 4 compliant, with select 2011+ variants meeting Euro 5 depending on market.
Limited tuning potential exists. ECU remaps can yield +5–10 kW by optimizing fuel and ignition maps, but gains are modest due to naturally aspirated design. Aftermarket exhaust and intake upgrades offer minor improvements. Over-advancing timing or using low-octane fuel risks knock and sensor intervention, so conservative tuning is advised.
In a Fiat 500 or Punto Evo, combined consumption is approximately 6.2 L/100km (45.7 mpg UK). City driving may see 7.5 L/100km (37.7 mpg), while highway runs can achieve 5.4 L/100km (52.3 mpg). Real-world economy depends on driving style, but 40–50 mpg (UK) is typical for well-maintained units on mixed routes.
Yes. The 312 B6.000 is an interference engine. If the timing belt fails or jumps, pistons can contact open valves, resulting in bent valves or cylinder head damage. Adhering to the 120,000 km or 6-year replacement interval is essential to prevent costly internal repairs.
Fiat specifies SAE 5W-30 oil meeting ACEA A1/B1 or API SL/CF standards. Use of high-quality synthetic oil is recommended, especially in hot climates. Change intervals should not exceed 15,000 km or 1 year to protect the valve train and timing components.
Comprehensive technical documentation and regulatory references
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FIAT 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
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
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