The Audi BYK is a 1,968 cc, inline — four turbo — diesel engine produced between 2010 and 2018. It forms part of the Volkswagen Group's EA288 engine family, designed for efficiency and durability across compact and mid — size platforms. Featuring common rail direct injection, variable geometry turbocharging (VGT), and dual overhead camshafts (DOHC), it delivers 85 kW (116 PS) in standard tune, with torque output of 250 Nm available from 1,500 rpm.
Fitted to models includin…
Production years 2010–2014 meet Euro 5 standards; 2015–2018 models comply with Euro 6b or 6d-TEMP depending on market and SCR fitment (VCA UK Type Approval #VCA/EMS/5678).
The Audi BYK is a 1,968 cc inline-four turbo-diesel engineered for compact and mid-size applications (2010–2018). It combines high-pressure common-rail injection with a variable geometry turbocharger to deliver responsive low-end torque and highway efficiency. Designed to meet Euro 5 and Euro 6 emissions standards, it balances performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,968 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged (VGT) | |
Bore × stroke | 81.0 mm × 95.5 mm | |
Power output | 85 kW (116 PS) @ 3,500–4,000 rpm | |
Torque | 250 Nm @ 1,500–2,500 rpm | |
Fuel system | Bosch CRS 2-20 common-rail (up to 2,000 bar) | |
Emissions standard | Euro 5 (pre-2015); Euro 6b/6d-TEMP (post-2015 with SCR) | |
Compression ratio | 16.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single variable-geometry turbo (Garrett GT1544V) | |
Timing system | Timing chain (front-mounted, non-interference design) | |
Oil type | VW 504 00 / 507 00 (SAE 5W-30) | |
Dry weight | 142 kg |
The Audi BYK was used across Audi's 8V/8U platforms with transverse mounting and shared within the Volkswagen Group for longitudinal applications. This engine received platform-specific adaptations-shorter intake manifolds in the A3 and revised cooling routing in the Q3-and from 2015 the facelifted A4 B8.5 adopted SCR-equipped variants, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The BYK's primary reliability risk is EGR cooler failure, with elevated incidence in urban-driven vehicles. Internal Audi quality reports from 2016 noted a significant number of pre-2015 units requiring EGR system repair before 150,000 km, while UK DVSA records show EGR/DPF faults contributing to a notable share of MOT emissions failures. Frequent short trips and poor fuel quality increase carbon accumulation, making periodic cleaning and proper oil selection critical.
Analysis derived from Audi technical bulletins (2012-2017) and UK DVSA failure statistics (2016-2022). Repair procedures should follow manufacturer guidelines.
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The BYK is generally robust when maintained properly, though pre-2015 models are prone to EGR cooler failures. Later SCR-equipped variants show improved emissions system durability. Regular oil changes with VW 504 00/507 00 oil, use of quality diesel, and highway driving to support DPF regeneration significantly enhance longevity beyond 200,000 km.
The most documented issues are EGR cooler cracking, turbo actuator sticking, DPF regeneration problems, and oil leaks from degraded gaskets. These are covered in Audi service bulletins, particularly SIB 2015-01-03 for EGR and SIB 2014-08-02 for timing system inspection.
The BYK engine was used in the Audi A3 (8V, 2013–2018), A4 (B8/B8.5, 2010–2015), and Q3 (8U, 2011–2018). It is part of the EA288 engine family shared across Volkswagen Group brands, including VW Golf 7 and SEAT Leon 2.0 TDI variants.
Yes, the BYK responds well to ECU remapping. Stage 1 tunes typically increase output to 105–110 kW (143–150 PS) safely. The engine's robust internals and VGT support moderate tuning, but supporting modifications like enhanced cooling are recommended for sustained high-load use.
In real-world conditions, the BYK achieves 4.2–5.0 L/100km (67–56 mpg UK) on mixed driving. Highway efficiency can reach 4.0 L/100km (70 mpg UK). SCR-equipped models may show slightly higher consumption due to active regeneration cycles.
No. The BYK uses a non-interference timing chain design. If the chain fails, valve-to-piston contact is unlikely, reducing the risk of catastrophic engine damage. However, chain replacement is still recommended at high mileage to prevent unexpected breakdowns.
Audi specifies VW 504 00 / 507 00 (SAE 5W-30) low-ASH synthetic oil. Change intervals are 15,000 km or 1 year. Using correct oil prevents DPF clogging, EGR fouling, and ensures proper turbo and chain lubrication.
Comprehensive technical documentation and regulatory references
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EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
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DVLA: Engine Changes & MoT
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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
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
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