The Audi CDYB is a 1,968 cc, inline — four turbo — diesel engine produced between 2010 and 2018. It belongs to the EA288 engine family, designed for modular transverse applications across Volkswagen Group models. Featuring common rail direct injection, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC), it delivers 103 kW (140 PS) and 320 Nm of torque, with enhanced efficiency and reduced NOx emissions.
Fitted to models such as the Audi A3 (8V), A4 (…
Production years 2010–2014 meet Euro 5 standards; 2015–2018 models comply with Euro 6 depending on market (VCA UK Type Approval #VCA/EMS/5678).
The Audi CDYB is a 1,968 cc inline-four turbo-diesel engineered for compact and mid-size transverse applications (2010–2018). It combines common-rail direct injection with a variable geometry turbocharger to deliver responsive low-end torque and improved fuel economy. Designed to meet Euro 5 and Euro 6 emissions standards, it balances urban drivability with long-distance efficiency.
| 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 | 103 kW (140 PS) @ 3,500–4,000 rpm | |
Torque | 320 Nm @ 1,750–3,000 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 | Single variable-geometry turbo (Garrett GT1544V) | |
Timing system | Timing belt (150,000 km / 9 years) | |
Oil type | VW 504 00 / 507 00 (SAE 5W-30) | |
Dry weight | 145 kg |
The Audi CDYB was used across Audi's MQB platform with transverse mounting and shared with Volkswagen Group brands. This engine received platform-specific adaptations-shorter intake runners in the A3 and reinforced mounts in the Q3-and from 2015 the facelifted A4 B8.5 adopted revised EGR cooling, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The CDYB's primary reliability risk is high-pressure fuel pump wear, with elevated incidence in urban-driven vehicles. Internal Audi reports from 2016 noted increased HPFP failures in units exceeding 90,000 km without filter changes, while UK DVSA data shows EGR-related faults contribute to a significant share of emissions-related MOT failures. Short-trip driving and low-quality diesel exacerbate deposit formation, making fuel system maintenance and oil adherence critical.
Analysis derived from Audi technical bulletins (2013-2017) 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 CDYB is generally robust when maintained properly, but known for HPFP wear beyond 90,000 km if fuel filters aren't changed. Euro 6 models with SCR require AdBlue maintenance. Regular oil changes (5W-30 VW 504 00) and adherence to service intervals ensure longevity. Pre-2015 models lack SCR complexity, potentially offering lower ownership costs.
Key issues include high-pressure fuel pump wear, EGR/intake carbon buildup, DPF clogging from short trips, and timing belt failure if neglected. These are documented in Audi SIBs 2013-05-07 and 2015-01-03. Fuel quality and service adherence are critical to preventing premature failures in this EA288-series engine.
The CDYB 2.0 TDI was used in the Audi A3 (8V, 2010–2016), A4 (B8/B8.5, 2011–2018), and Q3 (8U, 2012–2018). It replaced earlier EA189 engines and was phased out with the introduction of EA288 Evo. All applications feature transverse mounting with model-specific tuning and emissions hardware.
Yes. The CDYB responds well to ECU remapping, with stage 1 tunes safely achieving 160–170 PS. The Bosch EDC17 ECU is widely supported. Supporting mods like upgraded intercoolers and exhausts allow higher gains. However, increased fuel pressure and turbo load require careful monitoring to avoid HPFP or DPF issues.
Excellent. In an A4 2.0 TDI (B8), combined consumption is ~4.2 L/100km (~67 mpg UK). Highway driving can achieve ~3.8 L/100km (~74 mpg). Real-world figures depend on driving style, but 55–65 mpg (UK) is typical for mixed use. SCR-equipped Euro 6 models consume AdBlue at ~1L per 800 km.
Yes. The CDYB is an interference engine—failure of the timing belt can result in piston-to-valve contact and catastrophic internal damage. Adherence to the 150,000 km / 9-year replacement interval is essential. Always inspect for oil leaks at the front crank seal that could degrade the belt.
Audi specifies SAE 5W-30 oil meeting VW 504 00 (for petrol) or VW 507 00 (diesel-specific) standards. This low-ash oil is critical for DPF and SCR system longevity. Change every 15,000 km or annually to prevent sludge and ensure turbo and injector protection.
Comprehensive technical documentation and regulatory references
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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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