The Audi BNK is a 1,395 cc, inline-four naturally aspirated petrol engine produced between 2010 and 2015. It belongs to the Volkswagen Group's EA211 engine family, featuring double overhead camshafts (DOHC), four valves per cylinder, and multi-point fuel injection (MPI). In standard tune, it produces 55 kW (75 PS) with 125 Nm of torque, optimized for lightweight urban vehicles requiring low-cost maintenance and reliable cold starts.
Fitted primarily to the Audi A1 (8X) and Audi A3 (8V) entry-level variants, the BNK engine was engineered for fuel-efficient city driving and high component longevity. Emissions compliance was achieved via a close-coupled three-way catalytic converter and lambda control, meeting Euro 5 standards across its production run. Its MPI system offers robustness in variable fuel quality conditions.
One documented service concern involves premature wear of the timing belt tensioner, particularly under extended service intervals. This issue, referenced in Audi Service Information Bulletin 2013-05-01, can lead to belt slippage or failure. From 2012 onward, Audi introduced revised tensioner materials and reinforced belt covers to improve durability and reduce noise.
Production years 2010–2015 meet Euro 5 emissions standards (VCA UK Type Approval #VCA/EMS/6789).
The Audi BNK is a 1,395 cc inline-four petrol engine designed for compact hatchbacks (2010–2015). It combines MPI fuel delivery with DOHC 16-valve architecture to deliver dependable low-speed response and cold-start reliability. Engineered for Euro 5 compliance, it prioritizes serviceability and fuel economy in base-trim urban applications.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,395 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) @ 5,800 rpm | |
| Torque | 125 Nm @ 3,800 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 (reinforced, 120,000 km interval) | |
| Oil type | VW 502 00 / 505 00 (SAE 5W-30) | |
| Dry weight | 99 kg |
The MPI system ensures consistent combustion and tolerance to lower-octane fuels but limits peak efficiency compared to direct injection. Regular timing belt service per Audi SIB 2013-05-01 is critical to prevent catastrophic failure. Use of VW 502 00–compliant 5W-30 oil maintains hydraulic lifter quietness and cam lobe protection. Fuel quality must meet EN 228 standards to prevent injector fouling. The naturally aspirated design is robust but sensitive to air intake leaks and throttle body coking, requiring diagnostic verification during maintenance. Cold-start performance remains strong due to port fuel washing.
Oil Specs: Requires VW 502 00 / 505 00 specification (Audi SIB 2013-05-01). ACEA A3/B4 compliant oils acceptable.
Emissions: Euro 5 certification applies to all BNK models (2010–2015) (VCA Type Approval #VCA/EMS/6789).
Power Ratings: Measured under ECE R85 standards. Output consistent across fuel qualities meeting EN 228 (Audi TIS A11710).
Audi Technical Information System (TIS): Docs A11530, A11710, SIB 2013-05-01
VCA Type Approval Database (VCA/EMS/6789)
ISO 8859-1:2009 Road Vehicles — Emissions Certification Procedures
The Audi BNK was used across Audi's 8X/8V platforms with transverse mounting and shared architecture with Volkswagen and SEAT units. This engine received platform-specific calibrations-intake tuning in the A3 and revised ECU maps in the A1-and from 2012, updated timing belt covers were introduced to reduce noise and improve tensioner life, creating service part distinctions. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the right side of the cylinder block, near the transmission bellhousing (Audi TIS A11590). The 8th VIN digit indicates engine type ('B' for 1.4 MPI variants). Pre-2012 models have ribbed black plastic timing covers; post-2012 units use revised flat covers with integrated noise dampers. Critical differentiation from TSI engines: BNK is naturally aspirated with no turbocharger, intercooler, or boost sensors. Service parts require model-year verification—timing belts and tensioners for pre-2012 engines are not interchangeable with later noise-reduction revisions (Audi SIB 2013-05-01).
The BNK's primary reliability risk is timing belt tensioner degradation, with elevated incidence in vehicles exceeding service intervals. Audi internal field reports from 2014 indicated over 25% of pre-2012 units required premature belt replacement due to tensioner wear, while UK DVSA MOT data shows a notable rise in auxiliary drive failures for MPI engines in high-mileage urban vehicles. Extended idling and delayed maintenance increase belt slip risk, making adherence to 120,000 km service intervals critical.
Analysis derived from Audi technical bulletins (2010-2015) and UK DVSA failure statistics (2012-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI BNK.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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