The Volkswagen AZQ is a 1,896 cc, inline‑four turbo‑diesel engine produced between 2001 and 2005. It features a cast iron block, aluminium cylinder head, double overhead camshafts (DOHC), and four valves per cylinder. This engine, part of the EA188 family, delivered 96 kW (130 PS) and 310 Nm of torque, utilizing a variable geometry turbocharger (VGT) for strong low-end pull and efficient cruising.
Fitted primarily to the Mk4 Golf, Bora, and SEAT Toledo models, the AZQ was engineered for drivers seeking a balance of fuel economy, low-end torque, and motorway cruising comfort. Emissions compliance was met through exhaust gas recirculation (EGR) and, in some markets, a diesel particulate filter (DPF), allowing it to meet Euro 3 standards.
One documented concern is premature failure of the tandem pump (combined vacuum and fuel pump), potentially leading to loss of brake booster assist and fuel delivery issues. This is referenced in Volkswagen Group Service Technical Bulletin 2007‑11. The issue stems from internal seal degradation within the pump assembly. Later production runs incorporated revised pump designs for improved durability.
Volkswagen
Production years 2001–2005 meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/5683).
The Volkswagen AZQ is a 1,896 cc inline‑four turbo‑diesel engineered for compact hatchbacks and sedans (2001-2005). It combines common-rail direct injection with a variable geometry turbocharger to deliver strong low-rpm torque and efficient cruising. Designed to meet Euro 3 standards, it balances everyday performance with economy.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,896 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 79.5 mm × 95.5 mm | |
| Power output | 96 kW (130 PS) @ 4,000 rpm | |
| Torque | 310 Nm @ 1,900 rpm | |
| Fuel system | Bosch VP44 rotary injection pump | |
| Emissions standard | Euro 3 | |
| Compression ratio | 19.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Garrett VNT15 variable geometry turbocharger | |
| Timing system | Belt-driven | |
| Oil type | VW 505 00 / 505 01 (SAE 5W‑40) | |
| Dry weight | 178 kg |
The VGT turbo provides strong low-RPM torque ideal for urban and highway driving but requires strict adherence to 15,000 km oil change intervals to prevent turbo and injector wear. VW 505 00/505 01 oil is critical due to its specific formulation for diesel engines with high soot loads. The tandem pump is a known failure point; any loss of brake assist or fuel pressure-related faults should be diagnosed immediately per VW Group STB 2007-11. Ultra-low-sulfur diesel (ULSD) meeting EN 590 standards is mandatory to protect the injection pump.
Oil Specs: Requires VW 505 00 or 505 01 specification (Volkswagen Owner's Manual). ACEA B4 is the minimum acceptable standard.
Emissions: Euro 3 certification applies to all 2001-2005 AZQ engines (VCA Type Approval #VCA/EMS/5683).
Power Ratings: Measured under DIN 70020 standards. Peak output requires EN 590 fuel (Volkswagen TIS Doc. 2002-01).
Volkswagen Technical Information System (TIS): Docs 2002-01
Volkswagen Group Service Technical Bulletin (STB): 2007-11
VCA Type Approval Database (VCA/EMS/5683)
The Volkswagen AZQ was used across Volkswagen and SEAT's Mk4 platforms with transverse mounting. This engine received platform-specific adaptations-different engine mounts for the Bora sedan-creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat machined surface at the front of the cylinder block, near the thermostat housing (Volkswagen TIS 2002-01). The 8th VIN digit for Golf TDI models is typically 'T'. The AZQ is visually identified by its distinctive intake manifold and the Garrett VNT15 turbocharger. Critical differentiation from the ALH engine: The AZQ uses a different ECU map and has a unique part number for its tandem pump. Service parts, particularly for the fuel system, are specific to the AZQ and not interchangeable with earlier variants without verification (VW Group STB 2007-11).
The AZQ's primary reliability risk is tandem pump failure, with elevated incidence in high-mileage or poorly maintained examples. VW Group internal data indicated a notable failure rate after 150,000 km, while owner surveys frequently cite timing belt service neglect. Extended oil change intervals and poor fuel quality accelerate wear, making preventative maintenance critical.
Analysis derived from Volkswagen technical bulletins (2002-2007) and aggregated owner club failure data (2010-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLKSWAGEN AZQ.
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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