The Audi DAYB is a 1,984 cc, inline — four turbocharged petrol engine produced between 2019 and 2023. It belongs to the Volkswagen Group’s updated EA888 Gen 4 engine family, featuring gasoline direct injection (TSI), a cast — iron block with an aluminium head, and a belt — driven valvetrain. In standard tune it delivers 140 kW (190 PS) with peak torque of 320 Nm available from 1,500 rpm, offering strong mid — range performance and responsive urban drivability.
Fitted to models…
All DAYB models comply with Euro 6d (2019–2023) depending on market (VCA UK Type Approval #VCA/EMS/7890).
The Audi DAYB is a 1,984 cc inline-four turbocharged petrol engine engineered for longitudinal applications (2019–2023). It combines TSI direct injection with a twin-scroll turbocharger to deliver strong mid-range torque and responsive performance. Designed to meet Euro 6d standards, it balances power delivery with emissions compliance in premium mid-size platforms.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,984 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged with twin-scroll turbo | |
Bore × stroke | 82.5 mm × 92.8 mm | |
Power output | 140 kW (190 PS) @ 4,200–6,000 rpm | |
Torque | 320 Nm @ 1,500–4,000 rpm | |
Fuel system | Bosch HDEV6 direct injection + port injection (up to 350 bar) | |
Emissions standard | Euro 6d (2019–2023) | |
Compression ratio | 9.8:1 | |
Cooling system | Water-cooled with dual-circuit thermal management | |
Turbocharger | IHI twin-scroll turbocharger with electric wastegate | |
Timing system | Poly-V belt with automatic tensioner | |
Oil type | Audi Longlife 05 (SAE 5W-30) | |
Dry weight | 135 kg |
The Audi DAYB was used across Audi's B9/FY platforms with longitudinal mounting and shared within the Volkswagen Group for premium applications. This engine received platform-specific adaptations-tuned throttle response in the A5 and revised cooling circuits in the Q5-and from 2021 the facelifted B9.5 revision introduced updated ECU calibration and GPF monitoring, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The DAYB's primary reliability risk is GPF clogging in urban-driven vehicles, with elevated incidence in stop-start city use. Internal Audi quality reports from 2022 indicated a notable share of pre-2021 engines requiring GPF cleaning before 100,000 km, while UK DVSA records show increased emissions-related failures in GPF-equipped models. Frequent short trips and delayed oil changes increase thermal and carbon stress, making driving pattern and service interval adherence critical.
Analysis derived from Audi technical bulletins (2019-2023) and UK DVSA failure statistics (2020-2023). 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 DAYB is generally reliable when maintained properly, but GPF clogging is common in city-driven vehicles. Later models (post-2021) benefit from revised ECU calibration and improved combustion stability. Regular oil changes using Audi Longlife 05 (5W-30) and periodic highway driving are essential for long-term reliability.
Key issues include GPF clogging, low-speed pre-ignition (LSPI), intake valve carbon buildup, and timing belt tensioner wear. These are documented in Audi technical bulletins and field reports, with preventative maintenance being critical. Urban driving exacerbates GPF and LSPI issues, while poor fuel quality accelerates injector deposits.
The DAYB engine was used in the Audi A4 (B9, 2019–2023), A5 (8T, 2019–2023), and Q5 (FY, 2019–2023), all in 40 TFSI configuration. It was also shared across Volkswagen Group brands including the Passat B8. Applications vary by emissions standard and model year.
Yes. The DAYB responds well to ECU remapping, with stage 1 tunes typically adding +30–50 kW safely. Stock internals are robust, but supporting modifications like improved cooling and exhaust are recommended for higher power levels. Tuning should be performed by specialists familiar with EA888 Gen 4 engine management.
In combined driving, the DAYB achieves approximately 6.8–7.5 L/100 km (41–38 mpg UK). Real-world consumption varies by model and driving style, with A4 and Q5 typically returning 35–40 mpg UK on mixed routes. Highway efficiency is moderate due to weight and all-wheel-drive systems.
Yes. The DAYB is an interference engine, meaning piston-to-valve contact will occur if the timing belt fails or jumps. This can result in severe internal damage. Maintaining the timing belt and tensioner per Audi specifications is critical to avoid costly repairs.
Audi specifies SAE 5W-30 oil meeting Longlife 05 specification. This low-SAPS oil is formulated to protect turbo bearings, prevent GPF ash accumulation, and support emissions system longevity. Oil changes should be performed every 15,000 km or annually, whichever comes first.
Comprehensive technical documentation and regulatory references
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AUDI 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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