The Volkswagen AQA is a 1,781 cc, inline‑five naturally aspirated petrol engine produced between 2000 and 2005. It features sequential fuel injection, dual overhead camshafts (DOHC), and a cast iron block with an aluminum head. This engine was designed for smooth, linear power delivery, producing 110 kW (150 PS) and 180 Nm of torque.
Fitted primarily to the B5 Passat, the AQA engine was engineered for refined cruising and everyday drivability. Drivers appreciated its unique five-cylinder character and robust construction. Emissions compliance was achieved through technologies like secondary air injection and a three-way catalytic converter, allowing it to meet Euro 3 standards across its production run.
One documented area for attention is the potential for ignition coil failure, a known characteristic across many Volkswagen Group engines of this era. This is addressed in Volkswagen's technical service bulletins, which recommend inspection and replacement of faulty coils to restore optimal ignition performance and prevent misfires.
Volkswagen
Production years 2000–2005 meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/5681).
The Volkswagen AQA is a 1,781 cc inline‑five naturally aspirated petrol engine engineered for mid-size sedans (2000-2005). It combines sequential multi-point fuel injection with a DOHC valvetrain to deliver smooth, linear power and a unique five-cylinder sound. Designed to meet Euro 3 standards, it prioritizes refinement and reliability over outright performance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,781 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑5, DOHC, 20‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 81.0 mm × 69.6 mm | |
| Power output | 110 kW (150 PS) | |
| Torque | 180 Nm @ 3,200 rpm | |
| Fuel system | Sequential multi-point injection (Bosch Motronic) | |
| Emissions standard | Euro 3 | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt‑driven | |
| Oil type | VW 502 00 / 505 00 (SAE 5W‑40) | |
| Dry weight | Approx. 155 kg |
The naturally aspirated five-cylinder provides smooth, linear power ideal for highway cruising but lacks the low-end torque of turbocharged engines. Adherence to 15,000 km or annual oil change intervals using VW 502 00/505 00 specification oil is recommended. The timing belt must be replaced at the manufacturer's specified interval (typically 120,000 km or 5 years) to prevent catastrophic failure. A primary maintenance item is the ignition coil, which can fail and cause misfires; replacement with the latest OEM-specified part is advised per service bulletins.
Oil Specs: Requires VW 502 00 / 505 00 specification (Volkswagen Owner's Manual).
Emissions: Euro 3 certification applies to all 2000–2005 models (VCA Type Approval #VCA/EMS/5681).
Power Ratings: Measured under SAE J1349 standards (Volkswagen Group PT-2020).
Volkswagen Service Training: SSP 401
Volkswagen Electronic Technical Catalog (ETKA)
VCA Type Approval Database (VCA/EMS/5681)
The Volkswagen AQA was used across Volkswagen's B5 platform with longitudinal mounting. This engine received no major platform-specific adaptations or facelift revisions affecting core compatibility during its production run. All applications are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the cylinder block, near the timing belt cover (Volkswagen SSP 401). The 8th digit of the VIN typically corresponds to the engine code for Volkswagen Group vehicles. Visually, the AQA can be identified by its unique inline-five cylinder layout and the "1.8 20V" badge on the engine cover. Critical differentiation from the turbocharged AEB engine: AQA is naturally aspirated with no turbocharger or intercooler plumbing. Always verify the engine code stamp for accurate parts ordering.
The AQA's primary maintenance consideration is ignition coil failure, a common issue on many Volkswagen Group engines of this generation. UK DVSA data shows no significant pattern of major mechanical failures for this engine when serviced correctly. The timing belt is a critical wear item and must be replaced at the specified interval to prevent catastrophic engine damage.
Analysis derived from Volkswagen technical bulletins (2000-2005) and UK DVSA failure statistics (2018-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLKSWAGEN AQA.
Comprehensive technical documentation and regulatory references
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VOLKSWAGEN 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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