The Fiat 126 A.000 is a 594 cc, rear — mounted, air — cooled inline — two naturally aspirated petrol engine produced between 1972 and 1998. It features a simple overhead valve (OHV) configuration with a carbureted fuel system, delivering basic yet reliable performance for urban mobility. In standard tune, it produced 18 kW (24.5 PS) at 4,800 rpm, with peak torque of 41 Nm available at 3,000 rpm.
Fitted to the Fiat 126 city car, the 126 A.000 was engineered for minimalism, ease of…
Production years 1972–1990 meet Euro 0 standards; 1991–1998 models comply with Euro 1 .
The Fiat 126 A.000 is a 594 cc air-cooled inline-two naturally aspirated petrol engine designed for compact rear-engined city car applications (1972–1998). It features OHV valvetrain and single-carburetor fuel delivery to deliver dependable, low-cost transportation. Engineered for urban use, it balances simplicity with mechanical durability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 594 cc | |
Fuel type | Petrol (Unleaded or Leaded, 95 RON min) | |
Configuration | Inline-2, OHV, 2-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 75.0 mm × 67.0 mm | |
Power output | 18 kW (24.5 PS) @ 4,800 rpm | |
Torque | 41 Nm @ 3,000 rpm | |
Fuel system | Solex 31 PICT-1 single-barrel carburetor | |
Emissions standard | Euro 0 / Euro 1 (post-1991) | |
Compression ratio | 8.0:1 | |
Cooling system | Air-cooled, fan-forced | |
Turbocharger | None | |
Timing system | Gear-driven (internal, no belt or chain) | |
Oil type | Fiat 20W-50 (Selenia), API SE | |
Dry weight | 58 kg |
The Fiat 126 A.000 was used across Fiat's rear-engined platforms with rear-mounted configuration and no licensed applications. This engine received minor output updates between the 126 Base and 126 EL models, and from 1991 the introduction of catalytic converters created interchange limits. All adaptations are documented in OEM technical bulletins.
Engine Finders UK Ltd, which operates EngineCode.uk, can pass your enquiry to engine suppliers in the UK. The service is for vehicles in the United Kingdom, with UK delivery or fitting. This is a commercially connected service, and sending an enquiry does not confirm diagnosis or compatibility.
Diagnostic reminder: If a technician has recommended replacing the engine, you can send an enquiry to engine suppliers in the UK. Confirm the diagnosis first: an engine-code record does not diagnose a fault.
The 126 A.000's primary reliability risk is cylinder head overheating under sustained load, with elevated incidence in modified or poorly maintained vehicles. Internal Fiat service reports from 1985 noted a subset of pre-1984 units requiring head resurfacing before 80,000 km when cooling ducts were blocked, while VCA field data confirms carburetor icing in cold climates. Extended idling and low-octane fuel increase stress on ignition and fuel systems, making service interval adherence and fuel quality 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 126 A.000 is a mechanically simple and robust engine when maintained properly. Pre-1984 units have shown susceptibility to head warping if cooling ducts are blocked. Later revisions (1984+) feature improved finning and oil cooling. Regular oil changes with Fiat 20W-50 and adherence to cooling system maintenance are essential for long-term reliability.
Key issues include cylinder head warping (especially pre-1984), carburetor icing, distributor bushing degradation, and oil leaks. These are documented in Fiat service bulletins and field reports. Proper operation and maintenance significantly reduce occurrence.
The 126 A.000 powers the Fiat 126 (1972–1990) and 126 EL (1984–1998). It is not used in front-engined or commercial models. The engine features air-cooled OHV design and single-carburetor fuel delivery. It was succeeded by the 100-series OHV engine in later small Fiats.
Yes, within limits. Performance camshafts, high-flow exhaust, and tuned carburetors (e.g., Weber 32 PICT) can yield +5–10 kW. However, exceeding factory limits risks overheating and head damage. Always use 95+ RON fuel when modified. Periodic valve adjustment is critical with performance parts.
Official combined consumption is ~5.2 L/100km (~54.3 mpg UK) for the 126 Base. Real-world usage varies—urban driving may reach 6.0 L/100km (~47.1 mpg), while steady cruising can achieve ~4.8 L/100km (~58.8 mpg). The lightweight design and modest displacement contribute to excellent fuel efficiency.
No. The 126 A.000 is a non-interference engine. Because it uses a gear-driven timing system and low-lift cam profile, piston-to-valve contact cannot occur even if timing is lost. However, overheating can still cause catastrophic damage due to head warping or seizure.
Fiat specifies 20W-50 mineral oil meeting Fiat/Selenia standards (API SE). Oil must be changed every 10,000 km or annually. Using incorrect oil can lead to overheating, bearing failure, and seal degradation. Always use OEM-approved lubricants with high-temperature stability for air-cooled engines.
Comprehensive technical documentation and regulatory references
EngineCode.uk is operated by Engine Finders UK Ltd. It provides engine-reference information and an optional commercial enquiry service. It is not an official manufacturer website. Check the record's sources and confirm vehicle-specific details before relying on it for parts, repairs or replacement.
Our editorial standard prioritises relevant manufacturer documentation and official regulatory sources. The sources and verification status for a record should be checked alongside the data.
A statement is not verified merely because a source is listed. Where supporting evidence is missing or conflicting, the record should identify that limitation. Please report unsupported or inconsistent information.
Transparency in gaps
A missing or unverified value does not mean the manufacturer has withheld it. We distinguish information not yet verified, information not available to us, and information explicitly not disclosed by the source.
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.
Records are subject to review and correction. Source links, dates and verification notes should be read with the technical information. Our Editorial and Sourcing Policy explains our standards and review process.
Found an error or missing source? Report a problem with this page. Include the field or statement concerned and a supporting source if available. You can also email corrections@enginecode.uk.
Copyright and permissions
Images and other material may be protected by copyright. Attribution does not by itself grant permission to reuse material. If you believe material on this site infringes your rights, contact copyrights@enginecode.uk with the page URL and details of your claim. We will review the material and take appropriate action.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
Our Privacy Policy explains how Engine Finders UK Ltd uses information from visits, vehicle lookups, enquiries and messages. Our Cookie Policy explains cookies and similar technologies and how to change your choices.
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
Ownership and commercial services
EngineCode.uk is owned and operated by Engine Finders UK Ltd. Alongside our reference content, we offer an optional replacement-engine enquiry service through Engine Finders and may identify relevant services provided by businesses connected with us. These commercial connections are disclosed. Using an enquiry service is not required to read our reference content.
Engine Finders UK Ltd operates this website. Our optional enquiry service has a commercial purpose. Our Ownership and Commercial Disclosure explains the relationship between the reference website and that service. Participating suppliers pay a fee or subscription to participate on the network and receive quote requests.
Use this record as a starting point for identification. Specifications and vehicle applications may contain errors or omissions. Confirm the exact engine variant and compatibility using vehicle-specific documentation and a qualified supplier or technician.
All external links open in new tabs. Please verify current availability of resources.