The Volkswagen BAP is a 1,984 cc, inline‑four petrol engine produced between 2005 and 2010. It features an aluminium block and head, double overhead camshafts (DOHC), and 20 valves. This FSI (Fuel Stratified Injection) engine was designed for efficiency and performance, producing 147 kW (200 PS) and 280 Nm of torque, targeting a premium driving experience.
Fitted primarily to the Mk5 Golf GTI, Eos, and Passat B6, the BAP was engineered for responsive, high-revving performance with direct fuel injection for improved fuel economy under part load. Emissions compliance was managed through precise fuel metering and a catalytic converter, meeting Euro 4 standards for its production period.
One documented concern is carbon buildup on the intake valves, a known characteristic of early FSI engines without port injection. This issue, referenced in Volkswagen Service Technical Bulletin 2018‑03, can lead to rough idle and misfires. The problem stems from the lack of fuel washing over the valves, allowing oil vapours to bake on.
Volkswagen
Production years 2005–2010 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/9101).
The Volkswagen BAP is a 1,984 cc inline‑four petrol engine engineered for performance-oriented models (2005-2010). It combines DOHC 20-valve architecture with direct fuel injection (FSI) to deliver high specific output and a broad power band. Designed to meet Euro 4 emissions standards, it offers a blend of spirited performance and improved part-load efficiency.
| 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) @ 5,100–6,000 rpm | |
| Torque | 280 Nm @ 1,800–5,000 rpm | |
| Fuel system | Bosch Motronic MPI with FSI (Fuel Stratified Injection) | |
| Emissions standard | Euro 4 | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | KKK K04-023 | |
| Timing system | Chain-driven (requires inspection) | |
| Oil type | VW 502 00 / 505 00 (SAE 5W‑40) | |
| Dry weight | 132 kg |
The FSI system provides excellent throttle response and high specific output but necessitates periodic cleaning of intake valves to remove carbon deposits, typically every 60,000-80,000 km. Using VW 502 00 specification oil is critical to minimize deposit formation. The timing chain is designed for longevity but should be inspected for tensioner wear or chain stretch during major services. The high-pressure fuel pump (HPFP) is a known wear item; listen for unusual ticking noises.
Oil Specs: Requires VW 502 00 / 505 00 specification (Volkswagen Service Schedule). ACEA A3/B4 is the minimum acceptable standard.
Emissions: Euro 4 certification applies to all 2005–2010 BAP engines (VCA Type Approval #VCA/EMS/9101).
Power Ratings: Measured under DIN 70020 standards. Output is consistent across applications (Volkswagen SSP 324).
Volkswagen Technical Information System (ETKA): Docs 03C 103 088, SSP 324
Volkswagen Group Powertrain Specifications (PT-2007)
VCA Type Approval Database (VCA/EMS/9101)
The Volkswagen BAP was used across Volkswagen's Mk5 platform with transverse mounting. This engine received minor ECU and accessory adaptations between the Golf, Eos, and Passat applications. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the cylinder block, just below the #1 injector (Volkswagen SSP 324). The 8th digit of the VIN is typically 'P' for BAP-equipped vehicles. Visually, it features a black plastic intake manifold with "FSI" or "TFSI" embossed on the side. Critical differentiation from the lower-powered BWA/BPY engines: The BAP uses a larger K04 turbocharger and a different ECU map. Service parts, particularly for the turbo and intake, may not be interchangeable with 125 kW variants without verification.
The BAP's primary reliability risk is carbon buildup on intake valves due to its FSI design. Volkswagen service data indicates this is a common maintenance item rather than a failure, but neglect can lead to drivability issues. Vehicles used predominantly for short trips are most susceptible, making periodic cleaning critical.
Analysis derived from Volkswagen technical bulletins (2005-2015) and UK DVSA failure statistics (2010-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLKSWAGEN BAP.
Comprehensive technical documentation and regulatory references
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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
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
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