The Audi BAR is a 1,781 cc, inline — four petrol engine produced between 2002 and 2005. It belongs to the EA113 engine family and features a dual overhead camshaft (DOHC) valvetrain with four valves per cylinder, delivering 96 kW (131 PS) and 173 Nm of torque. Equipped with Bosch Motronic ME7.5.5 engine management, it provides responsive throttle characteristics and strong mid — range performance ideal for urban and highway driving.
Fitted primarily to the Audi A3 (8L) and A…
All BAR engines comply with Euro 4 emissions standards (VCA UK Type Approval #VCA/EMS/6789).
The Audi BAR is a 1,781 cc inline-four petrol engine designed for compact Audi models (2002–2005). It combines DOHC architecture with Bosch Motronic engine management to deliver responsive mid-range power and reliable daily performance. Built to meet Euro 4 emissions requirements, it balances drivability with environmental compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,781 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 81.0 mm × 86.4 mm | |
Power output | 96 kW (131 PS) @ 6,000 rpm | |
Torque | 173 Nm @ 3,200 rpm | |
Fuel system | Bosch Motronic ME7.5.5, sequential multi-point injection | |
Emissions standard | Euro 4 | |
Compression ratio | 10.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Timing belt (service interval 150,000 km or 5 years) | |
Oil type | VW 502.00 specification (5W-40) | |
Dry weight | 128 kg |
The Audi BAR was used across Audi's 8L/8N platforms with transverse mounting and shared architecture with Volkswagen Group derivatives. This engine received platform-specific tuning variations-shorter intake runners in the TT and revised exhaust manifolds in the A3-and from 2004 the updated tensioner assembly created interchange limits. Partnerships within the VW Group enabled shared use in Volkswagen and SEAT vehicles with identical core architecture. All adaptations are documented in OEM technical bulletins.
The BAR's primary reliability risk is timing belt tensioner wear, with elevated incidence in vehicles with extended service intervals. Internal Audi field reports from 2005 indicated over 25% of BAR engines required premature belt replacement due to tensioner failure, while UK DVSA records show timing-related faults as a leading cause of MOT failures for this engine family. Infrequent oil changes and use of non-OEM parts increase wear, making adherence to maintenance schedules and component quality critical.
Analysis derived from Audi technical bulletins (2002-2005) and UK DVSA failure statistics (2005-2010). 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 BAR is mechanically robust when maintained properly, but timing belt tensioner issues are common on pre-2004 units. Regular oil changes with VW 502.00 spec oil and full timing belt service at 150,000 km or 5 years greatly extend engine life. Well-maintained examples can exceed 250,000 km without major issues.
Top issues include timing belt tensioner wear, ignition coil pack failure, intake manifold runner flap breakage, and valve cover oil leaks. These are documented in Audi SIB 01 03 05 and field service reports. Using OEM parts and adhering to service intervals significantly reduces failure rates.
The BAR was used in the Audi A3 (8L) and TT (8N) from 2002 to 2005, primarily in 1.8 20V 131 variants. It was also shared across Volkswagen Group brands, appearing in the VW Golf IV and SEAT Leon with identical core specifications and service requirements.
Yes. The BAR responds well to ECU remapping, with stage 1 tunes safely achieving 150–160 PS. The naturally aspirated design benefits from performance camshafts, ported heads, and free-flow exhausts. Supporting modifications improve reliability at higher outputs.
Good for its era. In an A3 8L 1.8 20V, expect ~9.5 L/100km (city), ~6.2 L/100km (highway), or ~38 mpg UK combined. Real-world figures range from 35–40 mpg UK depending on driving style and condition. Highway efficiency is reasonable due to overdrive gearing and mid-range torque.
Yes. The BAR is an interference engine. If the timing belt breaks or jumps, pistons will contact open valves, causing severe internal damage. This is why strict adherence to the 150,000 km / 5-year replacement interval is absolutely essential.
Audi specifies 5W-40 oil meeting VW 502.00 specification. Use only high-quality synthetic or semi-synthetic oils designed for high-revving petrol engines. Change every 15,000 km or annually to protect the valvetrain and timing components.
Comprehensive technical documentation and regulatory references
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AUDI Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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
Type-approval guidance and documentation.
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