The Volkswagen AXU is a 1,390 cc, inline‑four petrol engine produced between 2006 and 2010. It features a dual overhead camshaft (DOHC) design with 16 valves and multi‑point fuel injection. This compact unit was engineered for efficiency in smaller platforms, delivering 55 kW (75 PS) and 126 Nm of torque, providing adequate performance for urban commuting.
Fitted primarily to the Polo (9N3) and Fox models, the AXU engine was designed for cost‑effective, reliable urban mobility. Its character prioritises fuel economy and low‑end responsiveness over outright power. Emissions compliance was managed through a conventional three‑way catalytic converter, meeting Euro 4 standards for its production period.
One documented service concern involves premature failure of the plastic coolant flange located on the cylinder head, which can lead to coolant leaks. This issue, addressed in Volkswagen Service Technical Bulletin 2036065/1, is attributed to material degradation under thermal cycling. The flange was subsequently revised in later production runs.
Volkswagen
Production years 2006–2010 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/5680).
The Volkswagen AXU is a 1,390 cc inline‑four petrol engine engineered for compact hatchbacks (2006-2010). It combines multi‑point fuel injection with a DOHC valvetrain to deliver adequate low‑end torque and frugal fuel consumption. Designed to meet Euro 4 standards, it prioritises urban efficiency and reliability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,390 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 76.5 mm × 75.6 mm | |
| Power output | 55 kW (75 PS) @ 5,400 rpm | |
| Torque | 126 Nm @ 3,750 rpm | |
| Fuel system | Multi‑point fuel injection (MPI) | |
| Emissions standard | Euro 4 | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt‑driven (requires periodic replacement) | |
| Oil type | VW 502 00 / 504 00 (SAE 5W‑40) | |
| Dry weight | Not specified in primary sources |
The naturally aspirated design offers predictable, linear power delivery ideal for city driving but lacks overtaking punch on highways. Strict adherence to the 90,000 km or 6-year timing belt replacement interval is critical to prevent engine damage. The plastic coolant flange (VW part no. 03C 121 121 C) is a known failure point; proactive replacement with the revised metal version per STB 2036065/1 is recommended. Use of VW 502 00/504 00 specification oil ensures optimal engine protection and longevity.
Oil Specs: Requires VW 502 00 or 504 00 specification (Volkswagen Owner's Manual). ACEA A3/B4 is the minimum acceptable standard.
Emissions: Euro 4 certification applies to all production years (2006-2010) (VCA Type Approval #VCA/EMS/5680).
Power Ratings: Measured under DIN 70020 standards (Volkswagen Group PT-2018). Output is consistent across all model applications.
Volkswagen Self-Study Programme (SSP) 384: The 1.4l 4-cylinder petrol engine
VCA Type Approval Database (VCA/EMS/5680)
Volkswagen ETKA Parts Catalogue
The Volkswagen AXU was used across Volkswagen's Polo platform with transverse mounting. This engine received minor ECU mapping adaptations for different trim levels, but no major mechanical revisions occurred during its production run, ensuring broad parts compatibility. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat machined surface at the front of the cylinder block, near the transmission flange (Volkswagen SSP 384). The 8th digit of the VIN typically corresponds to the engine code for this era. Visually, the AXU can be identified by its black plastic intake manifold and the "1.4" badge on the camshaft cover. Critical differentiation from the similar BCA engine: The AXU produces 75 PS, while the BCA produces 80 PS; ECU part numbers and software differ. Always verify the engine code stamping before ordering parts, as intake manifolds and ancillaries are generally interchangeable within the 1.4 MPI family.
The AXU's primary reliability risk is coolant flange failure, with elevated incidence in vehicles subjected to frequent short trips. Internal service data indicates this is the most common cause of coolant loss for this engine, while timing belt neglect remains the most catastrophic. Regular coolant system inspection and strict adherence to the timing belt schedule are critical.
Analysis derived from Volkswagen technical bulletins (2006-2010) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLKSWAGEN AXU.
Comprehensive technical documentation and regulatory references
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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)
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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
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VCA Certification Portal
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