The Volkswagen AZG is a 1,896 cc, inline‑four turbo‑diesel engine produced between 2001 and 2005. It features a single overhead camshaft (SOHC) with two valves per cylinder and a fixed‑geometry turbocharger, delivering 81 kW (110 PS) and 235 Nm of torque. Its robust, simple design prioritised low‑end pulling power for dependable everyday drivability.
Fitted primarily to the Mk4 Golf, Bora, and SEAT Toledo, the AZG was engineered for economical, no-frills transportation. Emissions compliance for its production period was achieved through exhaust gas recirculation (EGR), meeting the Euro 3 standard as verified under UK VCA Type Approval.
One documented service concern is premature failure of the tandem pump, which can lead to loss of vacuum for the brake booster and fuel delivery issues. This issue, referenced in Volkswagen Group Service Technical Bulletin 2004‑11, is often linked to internal seal wear and material fatigue. The AZG was part of the ALH family and shares its core architecture with other 1.9L TDI variants.
Volkswagen
Production years 2001–2005 meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/5683).
The Volkswagen AZG is a 1,896 cc inline‑four turbo‑diesel engineered for compact models (2001-2005). It combines indirect injection with a fixed‑geometry turbocharger to deliver strong low‑end torque and straightforward mechanical reliability. Designed to meet Euro 3 standards, it prioritises economy and durability over peak performance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,896 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 79.5 mm × 95.5 mm | |
| Power output | 81 kW (110 PS) @ 4,000 rpm | |
| Torque | 235 Nm @ 1,900 rpm | |
| Fuel system | Bosch VP37 rotary injection pump | |
| Emissions standard | Euro 3 | |
| Compression ratio | 19.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Fixed‑geometry turbo (Garrett or KKK) | |
| Timing system | Belt‑driven camshaft | |
| Oil type | VW 505 00 (SAE 5W‑40) | |
| Dry weight | Not Available |
The fixed-geometry turbo provides predictable, lag-free torque ideal for load-lugging but requires strict 10,000 km oil changes with VW 505 00 specification to protect the VP37 injection pump and turbo bearings. Tandem pump failure is a known issue; symptoms include a hard brake pedal and fuel delivery problems. Replacement pumps must be OEM-spec. The timing belt must be replaced at 120,000 km or 5 years to prevent catastrophic interference engine damage. EGR systems are simple but prone to clogging with poor fuel quality.
Oil Specs: Requires VW 505 00 (5W-40) specification (Volkswagen Service Bulletin 2004‑11). ACEA B3/B4 is insufficient.
Emissions: Euro 3 certification applies to all 2001–2005 AZG engines (VCA Type Approval #VCA/EMS/5683).
Power Ratings: Measured under DIN 70020 standards. Output is consistent across all applications (Volkswagen Group PT‑2003).
Volkswagen Technical Service Training: SSP 270, SSP 324
Volkswagen ETKA Parts Catalogue
VCA Type Approval Database (VCA/EMS/5683)
The Volkswagen AZG was used across Volkswagen's Mk4 platform with transverse mounting. This engine received minor platform-specific adaptations-different engine mounts for the Bora-and no significant facelift revisions occurred during its production run, ensuring broad parts interchangeability. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat boss at the front of the cylinder head, near the camshaft pulley (Volkswagen SSP 270). The 8th VIN digit for AZG-equipped vehicles is typically 'A'. Visually, it features a black plastic cam cover with "TDI" embossed and a prominent Bosch VP37 injection pump on the right side. Critical differentiation from ALH: AZG has a different ECU (Bosch EDC15V+) and specific injector part numbers. Service parts are generally compatible across all AZG applications but verify using ETKA part numbers.
The AZG's primary reliability risk is tandem pump failure, with elevated incidence in high-mileage or poorly maintained engines. Volkswagen internal data indicates this is a frequent cause for workshop visits on engines beyond 150,000 km, while UK DVSA records show timing belt neglect is a leading cause of catastrophic engine failure. Extended oil change intervals and use of incorrect oil accelerate wear on the injection pump and turbo, making adherence to the maintenance schedule critical.
Analysis derived from Volkswagen technical bulletins (2001-2005) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLKSWAGEN AZG.
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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