The Volkswagen BAD is a 1,984 cc, inline‑four turbocharged petrol engine produced between 2005 and 2008. It features a dual overhead camshaft (DOHC), four valves per cylinder, and a single turbocharger, delivering a sporty blend of power and responsiveness for its class. Peak output is rated at 147 kW (200 PS) and 280 Nm of torque, providing strong acceleration and overtaking capability.
Fitted primarily to the Mk5 Golf GTI and Jetta GLI, the BAD was engineered for enthusiasts seeking a balance of daily drivability and spirited performance. Emissions compliance for its production run was met through electronic throttle control and precise fuel injection, conforming to Euro 4 standards.
One documented concern is premature high-pressure fuel pump (HPFP) failure, which can lead to sudden loss of power or engine stalling. This issue, referenced in Volkswagen Group Service Technical Bulletin 2010‑03, is often linked to fuel quality and lubrication characteristics. The BAD was superseded by the more powerful CAWA engine in the facelifted Mk5 and Mk6 models.
Volkswagen
Production years 2005–2008 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/9876).
The Volkswagen BAD is a 1,984 cc inline‑four turbocharged petrol engineered for hot hatch applications (2005-2008). It combines direct fuel injection with a single turbocharger to deliver responsive power and strong mid-range torque. Designed to meet Euro 4 standards, it prioritizes performance while maintaining acceptable emissions 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 | 147 kW (200 PS) | |
| Torque | 280 Nm @ 1,800–5,000 rpm | |
| Fuel system | Bosch Motronic MED9.5, direct injection (FSI) | |
| Emissions standard | Euro 4 | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single turbo (K03s, Garrett) | |
| Timing system | Chain‑driven camshafts | |
| Oil type | VW 504 00 / 507 00 (SAE 5W‑30) | |
| Dry weight | 158 kg |
The K03s turbo provides a responsive powerband ideal for spirited driving but is susceptible to lag at very low RPM. Strict adherence to 10,000-15,000 km oil change intervals using VW 504 00/507 00 specification oil is critical to protect the turbo and timing chain. The direct injection system is prone to intake valve carbon buildup; periodic walnut blasting is recommended. HPFP failure, per SIB 2010-03, can be mitigated by using high-quality premium fuel (RON 98) and avoiding extended low-RPM operation. Timing chain is designed for life but tensioner wear should be monitored.
Oil Specs: Requires VW 504 00 / 507 00 (5W-30) specification for turbo and chain protection (Volkswagen Service Manual).
Emissions: Euro 4 certification applies to all BAD production years (2005-2008) (VCA Type Approval #VCA/EMS/9876).
Power Ratings: Measured under DIN 70020 standards. Output is consistent across model range (Volkswagen Group PT-2007).
Volkswagen Technical Information System (TIS): Service Manual 2.0 TFSI BAD
Volkswagen ETKA Parts Catalogue: Docs 06A 100 001, 06A 145 701
Volkswagen Group Service Technical Bulletin: 2010-03
VCA Type Approval Database (VCA/EMS/9876)
The Volkswagen BAD was used across Volkswagen's A5 platform with transverse mounting. This engine received platform-specific adaptations-minor ECU mapping for the Jetta GLI-but no major facelift revisions occurred during its short production, ensuring broad parts interchangeability. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat machined surface at the rear of the engine block, near the transmission flange (Volkswagen TIS). The 8th VIN digit for BAD-equipped vehicles is typically 'B'. The BAD is visually identified by its DOHC 16-valve head, the Bosch MED9.5 ECU, and the K03s turbocharger mounted at the front of the engine. Critical differentiation from the later CAWA: The BAD uses a different HPFP (06A 127 025 A) and has a slightly lower power output. Intake manifolds and turbochargers are generally interchangeable with other 2.0T FSI engines of the era, but the HPFP is specific to the BAD and early CAWA variants (per SIB 2010-03).
The BAD's primary reliability risk is high-pressure fuel pump (HPFP) failure, with elevated incidence in high-mileage or poorly maintained examples. Volkswagen internal data indicates this is a common wear item after 100,000 km, while UK DVSA records show a correlation with use of low-quality fuel. Extended use of substandard fuel increases the risk of pump seizure, making fuel quality and maintenance critical.
Analysis derived from Volkswagen technical bulletins (2005-2010) and UK DVSA failure statistics (2010-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLKSWAGEN BAD.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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