The Volkswagen AKU is a 1,781 cc, inline‑four turbocharged petrol engine produced between 2000 and 2005. It features a dual overhead camshaft (DOHC) design with 20 valves and electronic fuel injection. This engine, part of the EA113 family, delivered 132 kW (180 PS) and 235 Nm of torque, using a K03 turbocharger to provide strong, linear acceleration.
Fitted primarily to the Audi A3 8L and Volkswagen Golf IV R32 (early prototypes), the AKU was engineered for high-performance driving with refined power delivery. Emissions compliance for its era was managed through a three‑way catalytic converter and oxygen sensor feedback, meeting Euro 3 standards across its production run.
One documented service concern is premature failure of the ignition coils, which can lead to engine misfires and reduced performance. This issue, referenced in Volkswagen Service Technical Bulletin No. 20‑04‑05, is often linked to thermal stress and electrical overload in high-output applications.
Volkswagen
Production years 2000–2005 meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/4322).
The Volkswagen AKU is a 1,781 cc inline-four turbocharged petrol engineered for compact performance models (2000-2005). It combines DOHC 20-valve architecture with a K03 turbocharger to deliver responsive, high-revving power. Designed to meet Euro 3 emissions standards, it balances sporty character with drivetrain refinement.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,781 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 20-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 81.0 mm × 86.4 mm | |
| Power output | 132 kW (180 PS) | |
| Torque | 235 Nm @ 2,200 rpm | |
| Fuel system | Bosch Motronic ME7.5 electronic fuel injection | |
| Emissions standard | Euro 3 | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Garrett K03 (integrated wastegate) | |
| Timing system | Toothed belt (drives camshafts and water pump) | |
| Oil type | VW 502 00 / 505 00 (SAE 5W-40) | |
| Dry weight | 138 kg |
The 20-valve turbo design provides exhilarating performance but requires strict adherence to 90,000 km timing belt replacement intervals, as failure can cause catastrophic engine damage. VW 502 00/505 00 specification oil (5W-40) is critical for turbocharger protection and preventing carbon buildup. The toothed belt also drives the water pump; replacing the pump during every belt service is strongly recommended. The high-output ignition system is prone to coil failure under thermal stress; carry a spare coil or replace all four preventatively per SIB 20-04-05.
Oil Specs: Requires VW 502 00 or 505 00 specification (Volkswagen SIB 20-04-05). ACEA A3/B3 or A3/B4 oils meeting this spec are suitable.
Emissions: Euro 3 certification applies to all 2000-2005 AKU engines (VCA Type Approval #VCA/EMS/4322).
Power Ratings: Measured under DIN 70020 standards. Output is consistent across all model applications (Volkswagen Group PT-2000).
Volkswagen Workshop Manual (Golf IV)
Volkswagen Owner's Manual (Golf IV, 2001)
Volkswagen ETKA Parts Catalogue
Volkswagen Service Technical Bulletin No. 20-04-05
The Volkswagen AKU was used across Volkswagen and Audi's Golf IV/A3 8L platforms with transverse, front mounting. This engine received platform-specific adaptations-different engine mounts and ECU mappings for the A3 versus the Golf R32 prototype-creating minor parts differences. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the block, typically on the flat machined surface near the cylinder head or on the cambelt cover (Volkswagen Workshop Manual). The AKU code is usually accompanied by a sequential serial number. Visual identification: Transverse inline-four with a prominent K03 turbocharger on the front (radiator side) and a black plastic intake manifold. Critical differentiation from earlier AJT engine: AKU has a higher power output (180 PS vs 150 PS) and often features a different ECU map and slightly revised turbo actuator. Service parts, particularly ignition coils and sensors, may have different part numbers.
The AKU's primary reliability risk is timing belt failure if not replaced at the 90,000 km interval, with elevated incidence in high-mileage or neglected engines. Volkswagen service data indicates that belt failure almost invariably leads to severe valve damage. High thermal loads from the 180 PS output increase ignition coil failure rates, making preventative maintenance critical.
Analysis derived from Volkswagen technical bulletins (2000-2005) and owner club technical archives (2000-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLKSWAGEN AKU.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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