The Volkswagen AWX 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 employs multi‑point fuel injection and a turbocharger, delivering 132 kW (180 PS) and 235 Nm of torque, offering a potent blend of performance and responsiveness.
Fitted to performance models such as the Mk4 Golf R32 (in some markets), Bora, and Passat, the AWX was engineered for drivers seeking strong acceleration and a sporty character. Emissions compliance for its production period was met through its standard catalytic converter system, aligning with Euro 3 standards.
One documented concern is potential failure of the plastic coolant flange located at the rear of the engine, which can lead to coolant leaks. This issue, addressed in Volkswagen service documentation, is attributed to material degradation over time and heat cycles. Replacement with an updated, more durable part is the recommended corrective action.
Volkswagen
Production years 2001–2005 meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/5680).
The Volkswagen AWX is a 1,781 cc inline‑four turbocharged petrol engine engineered for performance-oriented compact and mid‑size vehicles (2001-2005). It combines DOHC 20-valve architecture with a turbocharger to deliver strong, linear power delivery. Designed to meet Euro 3 standards, it offers a high-performance driving experience within its generation.
| 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 | 132 kW (180 PS) @ 5,500 rpm | |
| Torque | 235 Nm @ 1,950 rpm | |
| Fuel system | Bosch Motronic multi-point injection | |
| Emissions standard | Euro 3 | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single turbocharger (K03) | |
| Timing system | Belt-driven | |
| Oil type | VW 502 00 / 505 00 (SAE 5W‑40) | |
| Dry weight | 135 kg |
The turbocharged 20-valve head provides strong, accessible torque ideal for spirited driving but requires strict adherence to 60,000-90,000 km timing belt replacement intervals to prevent catastrophic engine failure. VW 502 00 / 505 00 specification oil (5W-40) is critical for optimal lubrication and turbo longevity. The plastic coolant flange is a known failure point; proactive replacement with a metal or reinforced unit is recommended. The engine is an interference design, making timing belt integrity paramount. Ignition coil packs can fail with age, causing misfires.
Oil Specs: Requires VW 502 00 / 505 00 specification (Owner's Manual). Compatible with ACEA A3/B3 or A3/B4 standards.
Emissions: Euro 3 certification applies to all production years (2001–2005) (VCA Type Approval #VCA/EMS/5680).
Power Ratings: Measured under DIN 70020 standards. Output is specific to the AWX variant (Volkswagen SSP 272).
Volkswagen Service Technical Information (SSP 272)
Volkswagen ETKA Parts Catalogue
VCA Type Approval Database (VCA/EMS/5680)
The Volkswagen AWX was used across Volkswagen's Mk4 platform with transverse mounting. This engine received minor ECU and ancillary updates throughout its production run, but no major facelift revisions that create significant interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat surface of the cylinder block, adjacent to the gearbox flange (Volkswagen SSP 272). The 8th digit of the VIN typically corresponds to the engine code for Volkswagen Group vehicles. Visually, the AWX can be identified by its black plastic intake manifold and the "1.8T" badge on the engine cover. Critical differentiation from the naturally aspirated AUY/AVU: AWX has a turbocharger and associated plumbing. Service parts like the coolant flange (part no. 06A 121 107) are shared with other 1.8T variants.
The AWX's primary reliability risk is timing belt failure if service intervals are neglected, with catastrophic consequences due to its interference design. Secondary concerns include coolant flange leaks and ignition coil failures. Adherence to the maintenance schedule and proactive replacement of known weak points are critical for long-term reliability.
Analysis derived from Volkswagen technical bulletins (2001-2005) and UK DVSA failure statistics (2010-2020). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLKSWAGEN AWX.
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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