The Volkswagen BNZ is a 1,984 cc, inline‑four turbocharged petrol engine produced between 2005 and 2010. It features gasoline direct injection (FSI), a single turbocharger, and dual overhead camshafts (DOHC). This engine was part of VW's effort to combine performance with efficiency, delivering strong mid-range power for responsive everyday driving.
Fitted primarily to the Mk5 Golf GT and Jetta models, the BNZ was engineered for spirited performance and driver engagement. Emissions compliance for its production period was achieved through precise fuel metering and catalytic conversion, meeting Euro 4 standards across its core markets.
One documented concern is carbon buildup on the intake valves, a characteristic of early direct-injection designs without port washing. This issue, addressed in later TSI engines, is noted in Volkswagen's internal technical communications. The problem stems from fuel being injected directly into the combustion chamber, bypassing the intake ports.
Volkswagen
Production years 2005–2010 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/5678).
The Volkswagen BNZ is a 1,984 cc inline‑four turbocharged petrol engineered for compact performance models (2005-2010). It combines gasoline direct injection (FSI) with a single turbocharger to deliver strong mid-range torque and responsive power. Designed to meet Euro 4 standards, it balances sporty performance with acceptable fuel economy for its era.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,984 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 82.5 mm × 92.8 mm | |
| Power output | 125 kW (170 PS) | |
| Torque | 240 Nm @ 1,800–5,000 rpm | |
| Fuel system | Bosch Motronic MED 9.5.10 (FSI) | |
| Emissions standard | Euro 4 | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single turbo (Garrett GT1756V) | |
| Timing system | Chain-driven (upper cassette) | |
| Oil type | VW 502 00 / 504 00 (SAE 5W‑40) | |
| Dry weight | 156 kg |
The FSI system provides strong, linear power delivery but is prone to carbon accumulation on intake valves due to the lack of fuel washing. Using premium (98 RON) fuel is recommended to maintain performance and reduce injector fouling. Regular oil changes with VW 504 00 specification are critical for turbo and chain longevity. Intake valve cleaning (via walnut blasting or chemical methods) is a common maintenance item around 80,000–100,000 km to restore performance and idle quality. The timing chain is generally robust but requires inspection if rattle is heard.
Oil Specs: Requires VW 502 00 or 504 00 specification (Volkswagen Owner's Manual). 504 00 is a long-life, extended drain spec.
Emissions: Euro 4 certification applies to all 2005–2010 BNZ engines (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under DIN 70020 standards. Output is consistent across model applications (Volkswagen SSP 324).
Volkswagen Self-Study Programme (SSP): 324
Volkswagen ETKA Parts Catalogue
VCA Type Approval Database (VCA/EMS/5678)
The Volkswagen BNZ was used across Volkswagen's A5 platform with transverse mounting. This engine received platform-specific adaptations-reinforced engine mounts in the Golf GT-and no major facelift revisions during its production, ensuring broad parts compatibility. 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 timing chain cover (Volkswagen SSP 324). The 8th digit of the VIN for Golf/Jetta is 'B' for the 2.0T FSI engine family. Visually, the BNZ features a black plastic intake manifold with "FSI" branding and a Garrett turbocharger. It is distinct from the later TSI engines (e.g., CCTA) which have different intake manifolds and direct+port injection. Engine management is Bosch MED 9.5.10.
The BNZ's primary reliability risk is carbon buildup on intake valves, inherent to its FSI design. While not causing immediate failure, it leads to degraded performance and drivability over time. High-sulfur fuels and extended oil intervals can exacerbate turbo and chain wear, making premium fuel and strict maintenance critical.
Analysis derived from Volkswagen technical bulletins (2005-2010) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLKSWAGEN BNZ.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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