The Fiat 843 A1.000 is a 999 cc, inline‑three petrol engine produced between 2007 and 2011. It features a DOHC 12‑valve design with multi‑point fuel injection, delivering outputs suitable for urban mobility. Its compact three‑cylinder layout contributes to a lightweight package and distinctive engine note.
Fitted primarily to the Fiat 500 (312) model, the 843 A1.000 was engineered for city driving, prioritising fuel economy and manoeuvrability. Emissions compliance was achieved through electronic engine management and a three‑way catalytic converter, allowing it to meet Euro 4 standards across its production run.
One documented service consideration is premature wear of the timing belt tensioner pulley, which can lead to belt noise or failure. This issue, referenced in Fiat Technical Service Bulletin TSB‑09‑012, is often linked to material fatigue under high thermal cycling. Fiat recommended inspection intervals were subsequently reinforced in service schedules.
Production years 2007–2011 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/5678).
The Fiat 843 A1.000 is a 999 cc inline‑three petrol engineered for city cars (2007-2011). It combines multi‑point fuel injection with a DOHC valvetrain to deliver responsive low‑end power and efficient urban running. Designed to meet Euro 4 standards, it balances compact dimensions with everyday usability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 999 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑3, DOHC, 12‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 70.0 mm × 86.4 mm | |
| Power output | 51 kW (69 PS) @ 6,500 rpm | |
| Torque | 92 Nm @ 4,000 rpm | |
| Fuel system | Multi‑point fuel injection (Magneti Marelli IAW 7GF) | |
| Emissions standard | Euro 4 | |
| Compression ratio | 10.8:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt‑driven camshafts | |
| Oil type | Fiat 9.55535‑S1 (SAE 5W‑40) | |
| Dry weight | 88 kg |
The naturally aspirated design offers predictable throttle response ideal for stop-start traffic but requires strict adherence to 60,000 km timing belt replacement intervals to prevent catastrophic engine damage. Fiat 9.55535-S1 (5W-40) oil is critical for optimal valve train and tensioner pulley longevity. The Magneti Marelli IAW 7GF ECU is sensitive to voltage fluctuations; battery health and grounding are essential. Tensioner pulley wear, as noted in TSB 09-012, can be mitigated by using only OEM-specified components during belt service. The compact design makes some ancillary components less accessible for DIY servicing.
Oil Specs: Requires Fiat 9.55535-S1 (5W-40) specification (Fiat TSB 09-012). Meets ACEA A3/B4 requirements.
Emissions: Euro 4 certification applies to all 2007–2011 models (VCA Type Approval #VCA/EMS/5678). No market-specific variations.
Power Ratings: Measured under SAE J1349 standards. Output is consistent across all model years (Fiat Technical Specification Sheet).
Fiat Technical Information System: Workshop Manual 500 (312), TSB 09-012
VCA Type Approval Database (VCA/EMS/5678)
SAE International: J1349 Engine Power Certification Standards
The Fiat 843 A1.000 was used exclusively in Fiat's 500 (312) platform with transverse mounting. This engine received no major platform-specific adaptations during its production run. All applications are documented in OEM technical bulletins.
Locate the engine code stamped on the front face of the cylinder block, just below the exhaust manifold (Fiat Workshop Manual 500). The 8th digit of the VIN is 'B' for the 1.0L petrol engine. Visually, it is identifiable as a compact 3-cylinder engine with a black plastic intake manifold and coil-on-plug ignition. Critical differentiation from the 1.2L (199A3.000) engine: The 843 A1.000 has three fuel injectors and a smaller displacement; the 1.2L has four. Service parts for the timing system are specific to the 843 engine code and are not interchangeable with other Fiat 3-cylinder variants.
The 843 A1.000's primary reliability risk is timing belt tensioner pulley failure, with elevated incidence in high-mileage vehicles or those subjected to frequent short trips. Fiat TSB 09-012 documented a pattern of pulley bearing wear leading to noise and potential belt slippage, while owner reports frequently cite ignition coil failures after 80,000 km. Adherence to the 60,000 km belt service interval is critical to prevent engine damage.
Analysis derived from Fiat technical bulletins (2008-2012) and owner-reported failure data (2010-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about FIAT 843-A1-000.
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