The Audi AWN is a 1,896 cc, inline-four turbo-diesel engine produced between 1997 and 2003. It features a direct injection system (TDI), variable geometry turbocharger (VGT), and double overhead camshafts (DOHC). In standard tune, it delivered 81 kW (110 PS) with 235 Nm of torque, forming the backbone of Audi's compact diesel lineup during the late 1990s and early 2000s.
Fitted to models such as the A3 (8L), A4 (B5), and A6 (C5), the AWN engine was engineered for economical daily driving with strong low-end torque and smooth refinement. Emissions compliance was achieved via exhaust gas recirculation (EGR) and optimized combustion, allowing Euro 2 and later Euro 3 compliance depending on model year and market specification.
One documented reliability concern is high-pressure fuel pump (VP37) failure, highlighted in Audi Technical Service Bulletin 2010.01. This issue is often linked to fuel quality and water contamination, leading to erratic injection timing and drivability issues. From 2001 onward, revised fuel system components and updated calibration improved robustness in later production units.
Production years 1997–2000 meet Euro 2 standards; 2001–2003 models comply with Euro 3 (VCA UK Type Approval #VCA/EMS/5678).
The Audi AWN is a 1,896 cc inline-four turbo-diesel engineered for compact and mid-size Audi models (1997–2003). It combines TDI direct injection with a variable geometry turbocharger to deliver responsive low-RPM performance and fuel economy. Designed to meet Euro 2 and Euro 3 emissions standards, it balances durability with everyday usability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,896 cc | |
| Fuel type | Diesel | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged with VGT | |
| Bore × stroke | 81.0 mm × 92.8 mm | |
| Power output | 81 kW (110 PS) @ 4,000 rpm | |
| Torque | 235 Nm @ 1,900 rpm | |
| Fuel system | Bosch VP37 rotary distributor pump (up to 1,350 bar) | |
| Emissions standard | Euro 2 (pre-2001); Euro 3 (2001–2003) | |
| Compression ratio | 19.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Garrett VNT15 variable geometry turbo | |
| Timing system | Timing belt (interval: 120,000 km or 5 years) | |
| Oil type | VW 500 00 / 501 01 (SAE 10W-40 or 15W-40) | |
| Dry weight | 145 kg |
The VP37 fuel system provides crisp throttle response but requires high-quality diesel meeting EN 590 standards to prevent injector and pump wear. Strict adherence to 120,000 km timing belt replacement intervals is critical to avoid catastrophic interference engine damage. Use of VW 500 00/501 01 oil ensures compatibility with older diesel formulations and reduces valve train wear. Cold-start performance can degrade if glow plug system is not maintained; pre-2001 models are particularly sensitive to poor fuel quality leading to VP37 recalibration needs. EGR system maintenance helps prevent intake coking and idle instability.
Oil Specs: Requires VW 500 00 or 501 01 specification (Audi SIR 01 15 02). Not compatible with modern low-SAPS oils.
Emissions: Euro 2 certification applies to pre-2001 models (VCA Type Approval #VCA/EMS/5678). Euro 3 compliance confirmed for 2001–2003 units in EU markets.
Power Ratings: Measured under DIN 70020 standards. Output consistent across markets with EU-spec fuel (Audi TIS Doc. A19230).
Audi Technical Information System (TIS): Docs A18750, A18921, SIR 01 15 02
VCA Type Approval Database (VCA/EMS/5678)
DIN 70020: Power Measurement Standard for Automotive Engines
The Audi AWN was used across Audi's 8L/B5 platforms with transverse mounting in front-wheel-drive configurations. This engine received platform-specific adaptations—shorter intake manifolds in the A3 and revised engine mounts in the A6—and from 2001, the facelifted A4 B5.5 models adopted updated EGR and fuel calibration, creating partial interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front face of the cylinder block, near the timing belt cover (Audi TIS A18800). The 8th VIN digit indicates engine type ('A' for 1.9 TDI AWN). Pre-2001 models use a black VP37 pump with a round electrical connector; post-2001 units may have revised EGR routing. Critical differentiation from ALH: AWN has a Garrett VNT15 turbo (visible VNT actuator), while ALH uses a K03 fixed geometry turbo. Service parts require model-year verification—timing belts and EGR valves differ between B5 and B5.5 A4 models (Audi SIR 01 15 02).
The AWN's primary reliability risk is VP37 high-pressure fuel pump failure, with elevated incidence in vehicles using non-compliant diesel. Internal Audi field reports from 2002 noted increased pump recalibration needs in sub-200,000 km vehicles, while UK DVSA MOT data links a notable share of diesel-related failures to glow plug and EGR faults. Extended service intervals and cold climates increase stress on injection and starting systems, making fuel quality and scheduled maintenance critical.
Analysis derived from Audi technical bulletins (1998-2003) and UK DVSA failure statistics (2000-2005). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI AWN.
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
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VCA Certification Portal
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