The Volkswagen ASZ is a 1,984 cc, inline‑four turbocharged petrol engine produced between 2005 and 2010. It features a dual overhead camshaft (DOHC) design with 20 valves and Volkswagen's Fuel Stratified Injection (FSI) direct injection system. This combination aimed to deliver high specific output and efficiency, producing 147 kW (200 PS) and 280 Nm, making it a performance — oriented unit for its era.
Fitted primarily to the Golf Mk5 R32, Eos, and Passat B6, the ASZ was e…
Volkswagen
Production years 2005–2010 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/ASZ01).
The Volkswagen ASZ is a 1,984 cc inline‑four turbocharged petrol engine engineered for performance models (2005-2010). It combines direct fuel injection (FSI) with a single turbocharger to deliver high power output and responsive torque. Designed to meet Euro 4 standards, it prioritises performance while maintaining acceptable emissions for its production era.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,984 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 20‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 82.5 mm × 92.8 mm | |
Power output | 147 kW (200 PS) | |
Torque | 280 Nm @ 2,000 rpm | |
Fuel system | Fuel Stratified Injection (FSI) direct injection | |
Emissions standard | Euro 4 | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | KKK K04 turbocharger | |
Timing system | Chain‑driven | |
Oil type | VW 502 00 / 504 00 (SAE 5W‑40) | |
Dry weight | Not available in source documentation |
The Volkswagen ASZ was used across Volkswagen's Golf Mk5 and B6 platforms with transverse mounting. This engine received platform-specific adaptations-reinforced engine mounts in the R32 for performance-and no significant facelift revisions during its production run, ensuring broad parts interchangeability. All adaptations are documented in OEM technical bulletins.
The ASZ's primary reliability consideration is carbon buildup on intake valves, a systemic trait of its FSI design. Internal Volkswagen service data indicates this is a common maintenance item rather than a failure, while its robust mechanical design ensures good longevity. Using the correct petrol specification and adhering to service intervals are critical for sustained performance.
Analysis derived from Volkswagen technical bulletins (2005-2010) and aggregated European service data. Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The ASZ is generally mechanically robust with a strong bottom end and timing chain. Its main considerations are carbon buildup on intake valves and potential HPFP failure. With proactive maintenance (valve cleaning, timely HPFP/follower replacement, using correct oil), these engines can reliably exceed 200,000 km.
The most frequent issues are intake valve carbon buildup, high-pressure fuel pump (HPFP) and cam follower wear, ignition coil failure, and PCV system faults. These are well-documented in Volkswagen service literature and owner experiences.
The ASZ was primarily used in the Volkswagen Golf Mk5 R32 (2005-2008), Eos 2.0 TFSI (2006-2008), and Passat B6 2.0 TFSI (2005-2010). It was the 200 PS variant of the 2.0 TFSI engine for these platforms.
Yes, very successfully. The ASZ responds well to ECU remapping, with Stage 1 tunes reliably producing 240-260 PS. Supporting modifications like a high-flow downpipe, intercooler, and upgraded HPFP/follower are recommended for Stage 2+ to ensure reliability under increased stress.
Fuel economy is moderate for a performance engine. In a Golf R32, expect 25-30 mpg (UK) (9.4-7.8 L/100km) on a mixed cycle. A Passat B6 might achieve 30-35 mpg (UK) (7.8-6.7 L/100km) under similar conditions, heavily dependent on driving style.
Yes. The ASZ is an interference engine. If the timing chain fails or jumps significantly, the pistons will collide with the valves, causing severe internal engine damage. While the chain is designed to last the engine's life, tensioner failure can occur, making listening for chain rattle important.
Volkswagen specifies oil meeting the VW 502 00 or 504 00 standard, typically a 5W-40 synthetic. This is crucial for protecting the high-pressure fuel pump cam follower and turbocharger. Change intervals should not exceed 15,000 km or 12 months, though more frequent changes (10,000 km) are recommended for tuned engines or harsh conditions.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with VOLKSWAGEN or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialVOLKSWAGEN documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed”.
All external links open in new tabs. Please verify current availability of resources.