The Audi CDYA is a 1,968 cc, inline-four turbo-diesel engine produced between 2010 and 2018. It features a common rail direct injection system, variable geometry turbocharger (VGT), and DOHC 16-valve configuration. In standard tune, it delivers 81 kW (110 PS), with torque output of 250 Nm, providing responsive low-end performance for compact and mid-size Audi models.
Fitted primarily to the Audi A3 (8V), A4 (B8), and TT (8S) platforms, the CDYA was engineered for efficient urban and highway driving with strong low-rpm torque. Emissions compliance was achieved through exhaust gas recirculation (EGR), a diesel particulate filter (DPF), and selective catalytic reduction (SCR) in certain markets, enabling Euro 5 certification across its production run.
One documented reliability concern is high-pressure fuel pump (HPFP) degradation under extended service intervals, highlighted in Audi Service Information Bulletin 01 12 10. Premature wear in the Bosch CP3 pump can lead to rail pressure instability and misfires. From 2015, revised lubrication protocols and updated pump calibration were introduced to improve durability and reduce failure incidence.
Production years 2010–2018 meet Euro 5 standards (VCA UK Type Approval #VCA/EMS/7890).
The Audi CDYA – Diesel is a 1,968 cc inline-four turbocharged diesel engine designed for Audi's compact and mid-size platforms (2010–2018). It combines common rail injection with a variable geometry turbocharger to deliver strong low-end torque and efficient cruising. Designed to meet Euro 5 emissions standards, it balances everyday drivability with regulated emissions control.
| 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 | 81 kW (110 PS) @ 3,500 rpm | |
| Torque | 250 Nm @ 1,500–2,500 rpm | |
| Fuel system | Bosch CP3 common-rail (up to 1,800 bar) | |
| Emissions standard | Euro 5 | |
| Compression ratio | 16.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single variable-geometry turbo (VGT) | |
| Timing system | Chain-driven (long-life, non-serviceable) | |
| Oil type | Audi Longlife 05 (SAE 5W-30) | |
| Dry weight | 148 kg |
The VGT turbo provides strong low-RPM torque ideal for city driving but requires strict adherence to 15,000 km or annual oil changes to maintain HPFP and turbo longevity. Audi Longlife 05 (5W-30) oil is critical due to its low-SAPS formulation protecting the SCR and DPF systems. Extended idling should be minimized to reduce soot loading in the DPF. The Bosch CP3 fuel pump demands ultra-low-sulfur diesel (ULSD) meeting EN 590 standards to prevent high-pressure wear. EGR/DPF systems require periodic regeneration and cleaning to maintain emissions compliance and prevent limp-mode events. Cold-start performance may degrade if glow plug service is delayed beyond 120,000 km.
Oil Specs: Requires Audi Longlife 05 (5W-30) specification (Audi SIB 01 12 10). Supersedes ACEA C3.
Emissions: Euro 5 certification applies to all models (2010–2018) (VCA Type Approval #VCA/EMS/7890).
Power Ratings: Measured under DIN 70020 standards. Output consistent across EU diesel grades meeting EN 590 (Audi TIS A19600).
Audi Technical Information System (TIS): Docs A19600, A19620, SIB 01 12 10
VCA Type Approval Database (VCA/EMS/7890)
DIN Standards: DIN 70020 Engine Power Measurement
The Audi CDYA – Diesel was used across Audi's MQB and MLB platforms with transverse and longitudinal mounting configurations. This engine received platform-specific adaptations-shorter accessory belts in transverse A3 variants and revised cooling paths in longitudinal A4 units-and from 2015 the facelifted A3 8V models adopted updated ECU calibrations for improved cold-start behaviour, creating minor service part differences. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the left side of the cylinder block near the exhaust manifold (Audi TIS A19645). The 8th VIN digit indicates engine type ('C' for 2.0L TDI). Pre-2015 models have silver valve covers with ribbed intake manifolds; post-2015 units use black valve covers and smoother intake runners. Critical differentiation from higher-output variants: The CDYA lacks the secondary air injection system and has a simpler ECU map. Service parts require model year verification—HPFP units for pre-2015 engines are incompatible with later models due to calibration changes per Audi SIB 01 12 10.
The CDYA – Diesel's primary reliability risk is high-pressure fuel pump degradation on neglected units, with elevated incidence in high-mileage urban vehicles. Internal Audi quality reports from 2014 indicated a significant number of pre-2015 engines suffering HPFP-related misfires beyond 100,000 km, while UK DVSA MOT records show a notable rate of emissions test failures linked to DPF clogging. Extended service intervals and short-trip driving increase soot loading and thermal stress, making adherence to maintenance schedules critical.
Analysis derived from Audi technical bulletins (2010-2018) and UK DVSA failure statistics (2012-2020). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI CDYA.
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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