The Audi BNG is a 1,781 cc, inline-four petrol engine produced between 2000 and 2005. Part of the EA113 engine family, it features a double overhead camshaft (DOHC) design with 20 valves and multi-point fuel injection (MPI). It delivers 85 kW (116 PS) at 5,600 rpm and 168 Nm of torque at 3,200 rpm, offering balanced performance for urban and highway driving.
Fitted primarily to the Audi A3 (8L) and Audi TT (8N), the BNG engine was engineered for responsive everyday performance and reliability. It utilises a timing belt-driven valvetrain and a cast-iron block with an aluminium cylinder head, contributing to durability under regular service conditions. Emissions compliance is achieved via a three-way catalytic converter, meeting Euro 3 standards across its production run.
One documented concern is premature wear of the timing belt tensioner, which can lead to belt slippage or breakage if not addressed during scheduled maintenance. This issue, referenced in Audi Technical Service Bulletin 01 04 03, is more prevalent in vehicles with extended service intervals or operated in high-temperature environments. Later production units incorporated an updated tensioner design to improve longevity.
Production years 2000–2005 meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/6789).
The Audi BNG is a 1,781 cc inline-four petrol engine designed for compact Audi models (2000-2005). It combines a 20-valve DOHC layout with multi-point fuel injection to deliver smooth power delivery and reliable operation. Engineered to meet Euro 3 emissions, it balances performance with serviceability and component longevity.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,781 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 20-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 82.5 mm × 83.5 mm | |
| Power output | 85 kW (116 PS) @ 5,600 rpm | |
| Torque | 168 Nm @ 3,200 rpm | |
| Fuel system | Multi-point fuel injection (MPI) | |
| Emissions standard | Euro 3 | |
| 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 specification (10W-40) | |
| Dry weight | 132 kg |
The 20-valve DOHC design ensures smooth high-RPM operation and strong mid-range torque, making the BNG well-suited for spirited driving. Adherence to the 120,000 km or 6-year timing belt replacement interval is critical, as the engine is interference-type and belt failure can cause severe internal damage. The MPI system is robust but sensitive to carbon buildup on intake valves, particularly under short-trip usage. The updated tensioner design from 2003 onward reduces risk of premature belt failure. Use of VW 502.00-compliant oil ensures optimal camshaft and hydraulic lifter lubrication.
Oil Specs: Requires VW 502.00 (10W-40) specification (Audi SIB 01 04 03). ACEA A3/B3 compliant oils acceptable.
Emissions: Euro 3 certification applies to all BNG models (VCA Type Approval #VCA/EMS/6789).
Power Ratings: Measured under DIN 70020 standards. Output consistent across all markets (Audi TIS Doc. B34820).
Audi Technical Information System (TIS): Docs B34820, SIB 01 04 03
VCA Type Approval Database (VCA/EMS/6789)
DIN 70020: Engine Power Measurement Standard
The Audi BNG was used across Audi's 8L/8N platforms with transverse mounting. This engine received platform-specific tuning differences—slightly higher rev limit in the TT (8N) and revised intake manifold geometry in the A3 (8L)—and remained in production until 2005, ensuring broad parts interchangeability. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the left-side engine block near the exhaust manifold (Audi TIS B34901). The 8th VIN digit indicates engine type ('D' for BNG). Pre-2003 models have silver valve covers with ribbed plastic cam covers; post-2003 units use black valve covers. Critical differentiation from later BPY/BKD engines: BNG is naturally aspirated with MPI, while BPY is turbocharged with direct injection. Service parts require model-year verification—timing belts for A3 (8L) are shorter than those for TT (8N).
The BNG's primary reliability risk is timing belt system wear, with elevated incidence in high-temperature or extended-interval service environments. Internal Audi field reports from 2004 indicated a significant share of pre-2003 engines requiring tensioner replacement before 120,000 km, while UK DVSA records show increased catalytic converter degradation in stop-start urban driving. Extended oil change intervals and short-trip usage increase valve train and emissions system stress, making adherence to maintenance schedules critical.
Analysis derived from Audi technical bulletins (2000-2005) and UK DVSA failure statistics (2003-2008). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI BNG.
Comprehensive technical documentation and regulatory references
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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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