The Audi BKH is a 1,968 cc, inline — four turbocharged diesel engine produced between 2010 and 2018. It features common rail direct injection (CRD), variable geometry turbocharging (VGT), and dual overhead camshafts (DOHC), delivering 103 kW (140 PS) and 320 Nm of torque. Its compact design and thermal efficiency make it ideal for transverse mounting in Audi's compact and mid — size platforms.
Fitted to models such as the 8V A3, 8W A4, and 3C A6, the BKH engine was engineered f…
Production years 2010–2014 meet Euro 5 standards; 2015–2018 models comply with Euro 6 depending on market (VCA UK Type Approval #VCA/EMS/6789).
The Audi BKH is a 1,968 cc inline-four turbocharged diesel engine engineered for compact and mid-size models (2010–2018). It combines common rail direct injection with variable geometry turbocharging to deliver strong low-end torque and smooth power delivery. Designed to meet Euro 5 and later Euro 6 emissions standards, it balances performance with fuel efficiency.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,968 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 81.0 mm × 95.5 mm | |
Power output | 103 kW (140 PS) @ 3,500–4,000 rpm | |
Torque | 320 Nm @ 1,750–2,750 rpm | |
Fuel system | Bosch CRS 2-20 common rail (up to 2,000 bar) | |
Emissions standard | Euro 5 (pre-2015); Euro 6 (2015–2018) | |
Compression ratio | 16.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Variable geometry turbo (Honeywell) | |
Timing system | Chain-driven (front-mounted; low wear risk) | |
Oil type | Audi Longlife 03 (SAE 5W-30) | |
Dry weight | 148 kg |
The Audi BKH was used across Audi's 8V/8W platforms with transverse mounting and no licensed external applications. This engine received platform-specific adaptations-shorter exhaust manifolds in the 8V A3 and revised cooling routing in the 8W A4-and from 2015 the facelifted 8V FL models adopted the BKH variant with updated EGR calibration, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The BKH's primary reliability risk is carbon buildup in the EGR and intake system on early builds, with elevated incidence in city-driven vehicles. Internal Audi quality reports from 2015 indicated a significant share of pre-2015 engines requiring EGR cleaning before 120,000 km, while UK DVSA records link a notable portion of emissions-related MOT failures to DPF clogging in urban environments. Short-trip cycles and low-speed operation increase soot accumulation, making driving pattern and oil quality adherence critical.
Analysis derived from Audi technical bulletins (2010–2018) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The BKH delivers strong torque and good fuel economy, but early models (2010–2014) had concerns with EGR and DPF clogging due to carbon buildup. Later revisions (post-2015) improved EGR calibration and regeneration logic, so well-maintained examples can be quite robust. Regular highway driving and using correct oil (5W-30 Audi Longlife 03) greatly aid longevity.
The biggest issues are EGR and intake carbon buildup, DPF clogging from short trips, and turbo actuator sticking. Other complaints include oil leaks from gaskets and occasional AdBlue system faults. These are well-documented in Audi service bulletins and technical reports.
This 2.0L diesel was used across Audi's lineup during the 2010–2018 period. It appeared in the A3 (8V), A4 (8W), and A6 (3C) as the 2.0 TDI variant. It was phased out in favour of EA288 Gen 2 engines with improved emissions control and DPF integration.
Yes. The BKH is tunable. ECU remaps can safely gain +30–50 kW on stage 1, as the stock internals handle increased torque. Aftermarket upgrades (intercooler, exhaust, intake) can further boost performance. Enthusiasts frequently remap A3 and A4 models for improved throttle response. Tuning should be done carefully with supporting modifications.
Excellent for a turbo diesel. In an A4 2.0 TDI (103 kW) from around 2013, typical consumption is ~5.8 L/100km (city) and ~4.2 L/100km (highway), or about 55 mpg UK combined. Real-world figures vary, but expect 50–60 mpg (UK) on mixed roads for a healthy BKH engine.
Yes. The BKH (like most modern Audis) is an interference engine. If the timing chain fails, pistons can strike open valves, causing catastrophic engine damage. However, the front-mounted chain system is generally robust when maintained with correct oil and intervals.
Audi specifies a 5W-30 synthetic oil meeting Audi Longlife 03 (or newer) spec. Always use a low-ash, high-quality oil designed for turbocharged diesels and change it every 15,000 km or as Audi recommends to ensure proper DPF and SCR system function.
Comprehensive technical documentation and regulatory references
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EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
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DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
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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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