The Audi WU is a 1,598 cc, inline-four petrol engine produced between 2008 and 2015. It features multi-point fuel injection (MPI), a single overhead camshaft (SOHC), and an 8-valve configuration, delivering 66 kW (90 PS) in standard tune. Designed for lightweight efficiency and low emissions, it powers entry-level Audi models with a focus on urban economy and ease of maintenance.
Fitted to models such as the A1 (8X) and A3 (8P), the WU engine was engineered for economical city driving and young driver accessibility. Emissions compliance is achieved through a three-way catalytic converter and precise lambda control, enabling Euro 5 certification across its production run. Its compact size and front transverse mounting support tight packaging in small hatchbacks.
One documented concern is premature throttle body wear, highlighted in Audi Service Information Bulletin 01 10 12. Carbon buildup on the throttle plate can restrict airflow and cause idle instability. From 2012, revised throttle bodies with improved sealing materials were introduced to mitigate wear in high-mileage applications.
Production years 2008–2010 meet Euro 5 standards; 2011–2015 models maintain Euro 5 compliance with updated OBD monitoring (VCA UK Type Approval #VCA/EMS/6789).
The Audi WU is a 1,598 cc inline-four petrol engine engineered for compact models (2008–2015). It combines multi-point injection with SOHC valvetrain to deliver reliable urban performance. Designed to meet Euro 5 standards, it prioritizes fuel economy and ease of maintenance in entry-level applications.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,598 cc | |
| Fuel type | Petrol (Unleaded, 95 RON) | |
| Configuration | Inline-4, SOHC, 8-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 82.0 mm × 75.6 mm | |
| Power output | 66 kW (90 PS) @ 5,800 rpm | |
| Torque | 132 Nm @ 3,800 rpm | |
| Fuel system | Multi-point fuel injection (Bosch ME 7.5.5) | |
| Emissions standard | Euro 5 | |
| Compression ratio | 10.3:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Timing belt (interval: 120,000 km or 6 years) | |
| Oil type | VW 502 00 / 5W-40 | |
| Dry weight | 105 kg |
The naturally aspirated design offers predictable throttle response ideal for city driving but requires strict adherence to 120,000 km or 6-year timing belt replacement intervals to prevent catastrophic engine damage. VW 502 00 (5W-40) oil is essential for camshaft and lifter longevity. Throttle body cleaning every 60,000 km helps maintain idle stability. Use of low-sulfur petrol (EN 228) prevents injector fouling. Post-2012 models feature upgraded throttle bodies; pre-2012 units should be inspected for carbon buildup per Audi SIB 01 10 12. Catalytic converter health depends on consistent warm-up cycles to prevent clogging.
Oil Specs: Requires VW 502 00 specification (Audi SIB 01 10 12). Compatible with ACEA A3/B3.
Emissions: Euro 5 certification applies to all production years (VCA Type Approval #VCA/EMS/6789). No Euro 6 variants exist.
Power Ratings: Measured under ECE R85 standards. Output not adjustable via fuel grade.
Audi Technical Information System (TIS): Docs A18510, A18750, SIB 01 10 12
VCA Type Approval Database (VCA/EMS/6789)
ISO 8855: Road Vehicles — Vehicle Dynamics and Chassis Components — Vocabulary
The Audi WU was used across Audi's 8X/8P platforms with transverse mounting and no licensed external applications. This engine received platform-specific adaptations-shorter intake manifolds in the A1 and revised ECU tuning in the A3-and from 2012 the facelifted A3 Sportback models adopted updated throttle bodies, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block near the transmission bellhousing (Audi TIS A18510). The 8th VIN digit indicates engine type ('B' for 1.6L MPI engines). Pre-2012 models have silver valve covers with black plastic cam covers; post-2012 units use black valve covers. Critical differentiation from EA111: WU engine lacks turbocharger and intercooler plumbing. Service parts require production date verification—timing belts for pre-2010 models are incompatible with later units due to tensioner redesign (Audi SIB 01 10 12).
The WU's primary reliability risk is throttle body wear, with elevated incidence in short-trip urban use. Internal Audi quality reports from 2013 noted increased idle instability in pre-2012 units before 80,000 km, while UK DVSA records show a notable share of emissions-related MOT failures linked to throttle response issues. Frequent cold starts and infrequent full-throttle operation increase carbon accumulation, making periodic cleaning and oil quality adherence critical.
Analysis derived from Audi technical bulletins (2010–2015) and UK DVSA failure statistics (2016–2022). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI WU.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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