The Volkswagen BWA is a 1,984 cc, inline‑four turbocharged petrol engine produced between 2005 and 2010. It features a cast‑iron block, aluminium head, dual overhead camshafts (DOHC), and variable valve timing on the intake. This FSI (Fuel Stratified Injection) engine delivered 147 kW (200 PS) and 280 Nm, offering a blend of performance and relative efficiency for its era.
Fitted to models such as the Mk5 Golf GTI, Jetta, Eos, and Passat B6, the BWA was engineered for spirited driving with strong mid‑range pull. Emissions compliance was achieved through precise direct injection and secondary air injection, meeting Euro 4 standards for its production run.
One documented concern is carbon buildup on the intake valves, a characteristic of early direct injection systems without port washing. This issue, noted in Volkswagen's internal service communications, can lead to rough running and reduced performance. Later FSI engines and the subsequent TSI generation incorporated design changes to mitigate this.
Volkswagen
Production years 2005–2010 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/5678).
The Volkswagen BWA is a 1,984 cc inline‑four turbocharged petrol engine engineered for performance hatchbacks and sedans (2005-2010). It combines Fuel Stratified Injection (FSI) with a single turbocharger to deliver strong mid‑range torque and responsive power. Designed to meet Euro 4 standards, it balances sporting character with acceptable fuel economy for its class.
| 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 | 147 kW (200 PS) @ 5,100-6,000 rpm | |
| Torque | 280 Nm @ 1,800-5,000 rpm | |
| Fuel system | Bosch MED9.5 FSI (direct injection) | |
| Emissions standard | Euro 4 | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | KKK K03 (Garrett in some markets) | |
| Timing system | Chain (front‑mounted) | |
| Oil type | VW 504 00 / 507 00 (SAE 5W‑30) | |
| Dry weight | 157 kg |
The FSI system provides strong performance but is prone to intake valve carbon buildup due to the lack of fuel washing over the valves. Using high-quality fuel and periodic induction cleaning (every 60,000-80,000 km) is recommended to maintain smooth operation. The timing chain is generally robust but requires inspection of tensioner and guides around 150,000 km. The K03 turbo offers good response but can suffer from bearing wear or wastegate issues in high-mileage examples. Oil changes must use VW 504 00/507 00 specification to protect the turbo and chain.
Oil Specs: Requires VW 504 00 / 507 00 (5W-30) specification (Volkswagen SSP 324). LongLife service intervals permitted with correct oil.
Emissions: Euro 4 certification applies to all production years (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under DIN 70020 standards (Volkswagen Group PT-2018).
Volkswagen Service Technical Information (SSP 324, 270)
Volkswagen Electronic Parts Catalogue (ETKA)
VCA Type Approval Database (VCA/EMS/5678)
The Volkswagen BWA was used across Volkswagen's A5 platform with transverse mounting. This engine received platform-specific adaptations-reinforced mounts in the Passat and specific ECU mappings for the Eos. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the cylinder block, just below the intake manifold (Volkswagen SSP 324). The 8th VIN digit for Volkswagen applications is typically 'B' for the BWA engine. Visually, it features a black plastic intake manifold with "FSI" branding and a distinctive silver cam cover. Critical differentiation from the later CCTA engine: BWA uses a cable throttle body and a different intake manifold design. The ECU part number (e.g., 03C 906 032) is also a key identifier.
The BWA's primary long-term concern is intake valve carbon buildup, inherent to its early FSI design. While not typically causing immediate failure, UK DVSA data shows it is a frequent cause of MOT advisories for misfires and emissions in high-mileage examples. Regular induction cleaning and using high-quality fuel are critical preventative measures.
Analysis derived from Volkswagen technical service bulletins (2006-2012) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLKSWAGEN BWA.
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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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