The Audi BUB is a 1,395 cc, inline — three petrol engine produced between 2010 and 2016. It belongs to the EA211 engine family and features a transverse — mounted layout with double overhead camshafts (DOHC), four valves per cylinder, and multi — point fuel injection (MPI). In standard tune it delivers 81 kW (110 PS) at 5,000 rpm and 160 Nm of torque between 1,500–3,500 rpm, providing responsive low — end performance ideal for urban driving.
Fitted to models such as the 8X A1, 8V A…
Production years 2010–2012 meet Euro 5 standards; 2013–2016 models maintain Euro 5 compliance across all markets (VCA UK Type Approval #VCA/EMS/6789).
The Audi BUB is a 1,395 cc inline-three petrol engine engineered for compact Audi models (2010–2016). It combines multi-point fuel injection with a compact DOHC valvetrain to deliver strong low-end torque and urban responsiveness. Designed to meet Euro 5 standards, it balances fuel economy with smooth drivability in transversely mounted applications.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,395 cc | |
Fuel type | Petrol | |
Configuration | Inline-3, DOHC, 12-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 74.5 mm × 80.0 mm | |
Power output | 81 kW (110 PS) @ 5,000 rpm | |
Torque | 160 Nm @ 1,500–3,500 rpm | |
Fuel system | Multi-point fuel injection (MPI) | |
Emissions standard | Euro 5 | |
Compression ratio | 10.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Timing belt (service interval: 150,000 km or 6 years) | |
Oil type | Audi Longlife 01 (SAE 5W-40) | |
Dry weight | 97 kg |
The Audi BUB was used across Audi's 8X/8V platforms with transverse mounting and shared architecture within the Volkswagen Group. This engine received platform-specific adaptations-shorter accessory belts in the 8X A1 and revised ECU mapping in the 8V A3-and from 2013, the facelifted 8V LCI models adopted updated emissions calibration, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The BUB's primary reliability risk is timing belt tensioner wear on early builds, with elevated incidence in high-mileage applications. Internal Audi quality reports from 2014 noted a significant share of pre-2014 engines requiring premature belt replacement before 120,000 km, while UK DVSA records link a notable portion of emissions-related MOT failures to EGR clogging in city-driven vehicles. Extended service intervals and frequent short trips increase valve train and EGR stress, making maintenance adherence critical.
Analysis derived from Audi technical bulletins (2010-2016) and UK DVSA failure statistics (2013-2020). 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 BUB is fundamentally robust with good mechanical design, but early models (2010–2013) are prone to timing belt tensioner failure if not maintained. Later revisions (post-2014) improved pulley durability, so well-maintained engines can exceed 180,000 km. Regular servicing, strict timing belt replacement, and using Audi Longlife 01 oil are essential for long-term reliability.
Key issues include timing belt tensioner wear, intake valve carbon buildup, EGR valve clogging, and valve cover oil leaks. These are documented in Audi service bulletins and field reports. The tensioner issue is most critical, as failure can result in bent valves. Carbon and EGR problems are manageable with proper maintenance and driving patterns.
The BUB engine was used in the Audi A1 (8X), A3 (8V), and TT (Typ 85) from 2010 to 2016. It was primarily offered in European markets with manual and S tronic transmissions. All applications comply with Euro 5 emissions standards, with minor ECU variations between models.
Limited tuning potential exists due to its naturally aspirated design and MPI fuel system. ECU remaps can yield modest gains (~10–15 kW) by optimizing ignition and throttle mapping, but significant power increases require forced induction upgrades. Most owners prioritize reliability over performance modifications for this engine.
In combined driving, the BUB achieves approximately 6.2–7.0 L/100 km (45–40 mpg UK). Highway efficiency improves to ~5.5 L/100 km (~51 mpg UK), while city driving may exceed 8.0 L/100 km (~35 mpg UK). Real-world consumption depends heavily on driving style and transmission type.
Yes. The BUB is an interference engine, meaning that if the timing belt fails, the pistons can strike the open valves, resulting in severe internal damage. This underscores the importance of adhering to the 150,000 km or 6-year replacement interval and using only OEM-spec components.
Audi specifies SAE 5W-40 oil meeting Audi Longlife 01 standard. This synthetic oil ensures proper lubrication of the timing components and valve train. Oil changes should be performed every 15,000 km or annually to maintain engine health and prevent premature wear.
Comprehensive technical documentation and regulatory references
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AUDI 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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