The Volkswagen AQY is a 2,791 cc, V6 petrol engine produced between 2000 and 2005. It features a dual overhead camshaft (DOHC) design with 30 valves (five per cylinder) and variable intake manifold geometry. This configuration delivers smooth, linear power, with a peak output of 150 kW (204 PS) and 270 Nm of torque, making it suitable for larger, more premium models.
Fitted primarily to the Passat B5.5 and Audi A4 B6, the AQY was engineered for refined, effortless cruising and strong highway overtaking ability. Emissions compliance was achieved under Euro 3 standards through the use of dual catalytic converters and sophisticated Bosch engine management.
One documented concern is premature failure of the plastic coolant flange located on the cylinder head, which can lead to coolant leaks. This issue, addressed in Volkswagen Technical Service Bulletin 2008608/5, is attributed to material degradation over time. Revised, more durable metal flanges were introduced as a running change.
Volkswagen
Production years 2000–2005 meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/5681).
The Volkswagen AQY is a 2,791 cc V6 petrol engine engineered for mid-size and executive sedans (2000-2005). It combines DOHC 30-valve architecture with a variable-length intake manifold to deliver broad, linear power and refined operation. Designed to meet Euro 3 standards, it prioritizes smoothness and strong top-end performance over ultimate fuel economy.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,791 cc | |
| Fuel type | Petrol | |
| Configuration | V6, DOHC, 30‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 82.5 mm × 86.4 mm | |
| Power output | 150 kW (204 PS) | |
| Torque | 270 Nm @ 3,200 rpm | |
| Fuel system | Bosch Motronic MPI (Multi-Point Injection) | |
| Emissions standard | Euro 3 | |
| Compression ratio | 10.6:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven (requires inspection) | |
| Oil type | VW 502 00 (SAE 5W‑40) | |
| Dry weight | 178 kg |
The 30-valve V6 provides a broad, linear powerband ideal for relaxed cruising but requires premium 95 RON fuel for optimal performance and to prevent knocking. The timing chain is designed for longevity but should be inspected for wear and tensioner function around 150,000 km. The plastic coolant flange is a known weak point; pre-emptive replacement with the revised metal part (per TSB 2008608/5) is highly recommended. Regular oil changes using VW 502 00 specification are essential for maintaining hydraulic tappet and chain tensioner health.
Oil Specs: Requires VW 502 00 specification (Volkswagen Owner's Manual). ACEA A3/B4 is the minimum equivalent standard.
Emissions: Euro 3 certification applies to all production years (VCA Type Approval #VCA/EMS/5681).
Power Ratings: Measured under DIN 70020 standards. Peak output requires 95 RON fuel (Volkswagen Workshop Manual SSP 265).
Volkswagen Technical Service Bulletins: TSB 2008608/5
Volkswagen Workshop Manuals: SSP 265, SSP 267
Volkswagen ETKA Parts Catalogue
VCA Type Approval Database (VCA/EMS/5681)
The Volkswagen AQY was used in Volkswagen's B5.5 platform with longitudinal mounting. This engine shared its core architecture with Audi's 2.8L V6 units but featured unique engine management calibrations for Volkswagen applications. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the cylinder block, near the oil filter housing and behind the accessory drive belt (Volkswagen SSP 265). The 8th VIN digit typically corresponds to the engine code ('C' for many 2.8L V6 variants, but verification via the block stamp is definitive). The AQY can be visually identified by its cast aluminum intake manifold with the "2.8 V6" badge and the presence of two separate ignition coil packs (one per cylinder bank). Critical differentiation from other 2.8L V6 codes (e.g., AQP, AHA) often requires checking the ECU part number or specific ancillary components. Service parts, particularly for the intake and ignition systems, may vary between model applications and require VIN or engine code verification.
The AQY's primary reliability risk is coolant system failure due to the plastic flange, with elevated incidence in high-mileage vehicles. Internal Volkswagen service data indicates this is a frequent cause of workshop visits. While the timing chain is robust, neglecting oil changes can lead to premature tensioner wear.
Analysis derived from Volkswagen technical bulletins (2000-2005) and UK DVSA failure statistics (2010-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLKSWAGEN AQY.
Comprehensive technical documentation and regulatory references
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VOLKSWAGEN 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
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
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