The Audi BHK is a 1,984 cc, inline-four turbocharged petrol engine produced between 2008 and 2012. It features direct fuel injection (FSI), double overhead camshafts (DOHC), and variable valve timing (VVT) on both intake and exhaust camshafts. In standard configuration, it delivers 125 kW (170 PS) and 280 Nm of torque, serving as a mid-range powertrain in Audi's compact and performance-oriented lineup.
Fitted to models including the A3 (8P), A4 (B8), and S3 (8P), the BHK engine was engineered for responsive performance and everyday drivability. It replaced earlier naturally aspirated units and introduced turbocharging to Audi's four-cylinder petrol range in Europe, meeting Euro 5 emissions standards through precise combustion control and an integrated exhaust manifold.
One documented reliability concern is premature carbon buildup on intake valves, particularly in stop-start urban driving conditions. This issue, referenced in Audi Technical Service Bulletin 20 09 15, stems from the absence of fuel washing over the valves in direct-injection engines. From 2010, revised intake port geometry and updated engine management software were introduced to mitigate deposit accumulation.
Production years 2008–2012 meet Euro 5 standards (VCA UK Type Approval #VCA/EMS/6789).
The Audi BHK is a 1,984 cc inline-four turbocharged petrol engine developed for compact and mid-size Audi models (2008–2012). It combines FSI direct injection with turbocharging and dual VVT to deliver strong mid-range torque and linear throttle response. Designed to meet Euro 5 standards, it balances performance with emissions compliance in real-world conditions.
| 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) @ 4,800–6,000 rpm | |
| Torque | 280 Nm @ 1,750–4,500 rpm | |
| Fuel system | Bosch HDEV5 high-pressure direct injection (up to 150 bar) | |
| Emissions standard | Euro 5 | |
| Compression ratio | 9.6:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single-scroll turbocharger (Honeywell GT1549V) | |
| Timing system | Timing chain (lifetime service interval under normal use) | |
| Oil type | Audi Longlife-01 (SAE 5W-40) | |
| Dry weight | 132 kg |
The BHK's broad torque curve enables relaxed motorway cruising and strong urban responsiveness, but direct injection necessitates periodic intake valve cleaning to prevent carbon-related performance loss. Audi Longlife-01 (5W-40) oil is essential for turbo bearing and high-pressure fuel pump longevity. The integrated exhaust manifold improves warm-up efficiency but increases underhood temperatures—ensuring coolant system integrity is critical. Cold starts should be followed by moderate driving to allow oil circulation before hard use. Use only 95 RON (99 RON recommended for sustained performance) to prevent knock and maintain ECU calibration.
Oil Specs: Requires Audi Longlife-01 (5W-40) specification (Audi TSB 20 07 12). Supersedes ACEA A3/B4.
Emissions: Euro 5 certification applies to all BHK models (2008–2012) (VCA Type Approval #VCA/EMS/6789).
Power Ratings: Measured under ISO 1585 standards. Output consistent across EU markets with 95+ RON fuel (Audi TIS Doc. A33060).
Audi Technical Information System (TIS): Docs A33060, A33120, TSB 20 09 15
VCA Type Approval Database (VCA/EMS/6789)
ISO 1585: Road vehicles — Methods of measurement of fuel consumption
The Audi BHK was used across Audi's 8P/B8 platforms with longitudinal mounting and shared architecture with Volkswagen Group's EA113-derived units. This engine received platform-specific adaptations-shorter intake runners in the A3 and revised cooling in the S3-and from 2010, the facelifted A4 B8.5 adopted updated engine management, creating software compatibility limits. Partnerships within the Volkswagen Group enabled shared component sourcing for turbochargers and fuel systems. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the left-side cylinder block, near the exhaust manifold (Audi TIS A33060). The 8th VIN digit indicates engine type ('C' for BHK series). Pre-2010 models have silver valve covers; post-2010 units use black. Critical differentiation from later EA888 Gen3: BHK uses a cast-iron block and external turbo wastegate actuator, while Gen3 uses aluminum block and internal wastegate. Service parts require production date verification—intake manifolds for pre-2010 models differ in port design (Audi TSB 20 09 15).
The BHK's primary reliability risk is intake valve carbon buildup, with elevated incidence in urban-driven or short-trip vehicles. Internal Audi field reports from 2011 indicated over 30% of high-mileage BHK engines required walnut blasting by 120,000 km, while UK DVSA MOT data shows misfire-related failures contribute significantly to emissions test failures. Extended oil intervals and low-octane fuel exacerbate combustion chamber deposits, making fuel quality and maintenance adherence critical.
Analysis derived from Audi technical bulletins (2008–2013) and UK DVSA failure statistics (2010–2022). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI BHK.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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