The Audi AWA is a 1,781 cc, inline-four petrol engine produced between 1999 and 2005. It features a DOHC 20-valve configuration with variable valve timing (VVT) and sequential multi-point fuel injection. Delivering 96 kW (131 PS) at 6,000 rpm and 173 Nm of torque at 4,500 rpm, it was engineered for responsive urban driving and efficient highway cruising.
Fitted to models such as the Audi A3 (8L), A4 (B5), and TT (8N), the AWA engine was designed to balance sporty performance with everyday usability. Emissions compliance was achieved through a three-way catalytic converter and lambda control, 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 failure. This issue, referenced in Audi Service Information Bulletin 01 07 03, is often attributed to inadequate tensioner spring integrity over time. Audi issued revised tensioner components in 2002, improving long-term reliability for later production units.
Production years 1999–2005 meet Euro 3 emissions standards (VCA UK Type Approval #VCA/EMS/5678).
The Audi AWA is a 1,781 cc inline-four petrol engine engineered for compact and mid-size platforms (1999–2005). It combines a 20-valve DOHC head with sequential fuel injection to deliver linear power delivery and smooth refinement. Designed to meet Euro 3 standards, it balances sporty responsiveness with daily drivability.
| 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 | 96 kW (131 PS) @ 6,000 rpm | |
| Torque | 173 Nm @ 4,500 rpm | |
| Fuel system | Sequential multi-point fuel injection | |
| 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 | Audi Longlife 01 (SAE 5W-40) | |
| Dry weight | 132 kg |
The DOHC 20-valve design provides smooth high-RPM power delivery but demands strict adherence to 120,000 km or 6-year timing belt replacement intervals to prevent catastrophic engine damage. Audi Longlife 01 (5W-40) oil is essential for maintaining hydraulic lash adjuster function and camshaft longevity. Extended idling or short-trip driving can accelerate carbon buildup on intake valves due to absence of direct injection. The engine management system requires adaptation resets after battery disconnection. Post-2002 models benefit from revised tensioner design; pre-2002 units should be inspected for tensioner spring degradation per Audi SIB 01 07 03. Catalytic converter efficiency should be monitored to maintain emissions compliance.
Oil Specs: Requires Audi Longlife 01 (5W-40) specification (Audi SIB 01 07 03). Supersedes ACEA A3/B3 requirements.
Emissions: Euro 3 certification applies to all production years (1999–2005) (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under DIN 70020 standards. Output consistent across all markets (Audi TIS Doc. A20115).
Audi Technical Information System (TIS): Docs A19820, A20115, SIB 01 07 03
VCA Type Approval Database (VCA/EMS/5678)
ISO 1585: Road vehicles — Engine test code — Net power
The Audi AWA was used across Audi's 8L/B5/8N platforms with transverse mounting. This engine received platform-specific adaptations-shorter accessory drives in the A3 and revised engine mounts in the TT-and from 2002 the facelifted A4 B5 Avant adopted a revised intake manifold, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block near the exhaust manifold (Audi TIS A19820). The 7th digit of the VIN indicates engine type ('A' for AWA series). Pre-2002 models have a ribbed intake manifold; post-2002 units feature a smooth-profile manifold. Critical differentiation from 1.8T: AWA is naturally aspirated with no turbocharger or intercooler. Service parts require production date verification—timing belt kits for pre-2002 engines are incompatible with post-revision units due to tensioner redesign (Audi SIB 01 07 03).
The AWA's primary reliability risk is timing belt tensioner failure on early builds, with elevated incidence in high-temperature climates. Internal Audi quality reports from 2004 noted increased belt slippage incidents in units with original tensioners beyond 100,000 km, while VCA records indicate a notable share of emissions failures linked to lambda sensor degradation in high-mileage vehicles. Extended service intervals and short-trip driving increase valve train and catalyst stress, making timing maintenance and oil quality adherence critical.
Analysis derived from Audi technical bulletins (1999–2005) and UK DVSA failure statistics (2000–2010). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI AWA.
Comprehensive technical documentation and regulatory references
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UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
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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.
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