The Volkswagen AVQ is a 1,781 cc, inline‑four turbocharged petrol engine produced between 2001 and 2005. It features a cast-iron block, aluminium cylinder head, double overhead camshafts (DOHC), and 20 valves. This engine, part of the EA113 family, was engineered to deliver spirited performance with strong mid-range torque for compact and mid-size applications.
Fitted primarily to the Mk4 Golf GTI, Bora, and New Beetle, the AVQ generated 150 PS and was designed for responsive acceleration and sporty handling. Emissions compliance for its production period was achieved through electronic throttle control and a three-way catalytic converter, meeting the Euro 3 standard.
One documented concern is premature failure of the plastic coolant flange located at the rear of the cylinder head, which can lead to coolant leaks. This issue, referenced in Volkswagen Group Service Technical Information, is attributed to material degradation over time. Later engines in the family received revised, more durable components.
Volkswagen
Production years 2001–2005 meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/5680).
The Volkswagen AVQ is a 1,781 cc inline‑four turbocharged petrol engineered for performance-oriented compact models (2001-2005). It combines DOHC 20-valve architecture with a single turbocharger to deliver strong mid-range torque and responsive power delivery. Designed to meet Euro 3 standards, it balances sporty performance with acceptable emissions.
| 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 | 110 kW (150 PS) @ 5,700 rpm | |
| Torque | 210 Nm @ 1,750–4,500 rpm | |
| Fuel system | Multi-point fuel injection (Bosch Motronic) | |
| Emissions standard | Euro 3 | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single turbocharger (KKK K03) | |
| Timing system | Belt-driven camshafts | |
| Oil type | VW 502 00 (SAE 5W‑40) | |
| Dry weight | 132 kg |
The turbocharged 20-valve design provides strong, accessible torque but requires strict adherence to 15,000 km oil change intervals using VW 502 00 specification oil to prevent sludge buildup and turbo wear. The plastic coolant flange at the rear of the head is prone to cracking; proactive replacement with an aluminium unit is recommended. The timing belt is critical and must be replaced at 120,000 km or 5 years to prevent interference engine damage. Use of 95 RON (EU) unleaded fuel is mandatory for optimal performance.
Oil Specs: Requires VW 502 00 (5W-40) specification (Volkswagen TIS Doc. 2004/02). Critical for preventing sludge and turbocharger damage.
Emissions: Euro 3 certification applies to all 2001-2005 AVQ models (VCA Type Approval #VCA/EMS/5680).
Power Ratings: Measured under DIN 70020 standards. Output is consistent across all model applications (Volkswagen Group PT-2004).
Volkswagen Technical Information System (TIS): Docs 2004/02, 2005/18
VCA Type Approval Database (VCA/EMS/5680)
DIN 70020 Engine Power Certification Standards
The Volkswagen AVQ was used across Volkswagen's Mk4 platform with transverse mounting. This engine received no major mechanical revisions during its production run, ensuring broad parts compatibility. 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 TIS 2004/02). The 8th VIN digit typically indicates engine type for VW Group vehicles. Visually, the AVQ can be identified by its black plastic cam cover with "1.8T" branding and the presence of a KKK K03 turbocharger. Critical differentiation from other 1.8T variants (e.g., AUM, AMK): AVQ has a specific ECU map for 150 PS output. Service parts, particularly the turbocharger and associated plumbing, are generally interchangeable with other 1.8T 20V engines of the same era.
The AVQ's primary reliability risk is coolant flange failure, with elevated incidence in high-mileage or poorly maintained vehicles. Internal Volkswagen service data indicates this is a prevalent issue for the AVQ, while general owner reports frequently cite timing belt neglect as a cause of catastrophic failure. Extended service intervals accelerate component wear, 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 AVQ.
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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
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VCA Certification Portal
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