The Audi CDUD is a 1,968 cc, inline — four turbo — diesel engine produced between 2008 and 2013. It forms part of the Volkswagen Group's EA189 engine family, featuring common rail direct injection, variable geometry turbocharging (VGT), and dual overhead camshafts (DOHC). In standard tune it delivers 103 kW (140 PS) and 320 Nm of torque, with consistent performance across multiple vehicle platforms.
Fitted to models such as the A3 (8P), A4 (B7/B8), A6 (C6/C7), and Q5 (8R), t…
Production years 2008–2013 meet Euro 5 standards (VCA UK Type Approval #VCA/EMS/5678).
The Audi CDUD is a 1,968 cc inline-four turbo-diesel engineered for compact and mid-size models (2008–2013). It combines common-rail direct injection with a variable geometry turbocharger to deliver responsive torque and efficient operation. Designed to meet Euro 5 standards, it balances performance with emissions 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 | 103 kW (140 PS) @ 3,500–4,000 rpm | |
Torque | 320 Nm @ 1,750–2,500 rpm | |
Fuel system | Bosch CRS 2.0 common-rail (up to 1,600 bar) | |
Emissions standard | Euro 5 | |
Compression ratio | 16.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single variable-geometry turbo (Garrett GT1749V) | |
Timing system | Timing belt (interval: 180,000 km or 10 years) | |
Oil type | VW 504 00 / 507 00 (SAE 5W-30) | |
Dry weight | 145 kg |
The Audi CDUD was used across Audi's 8P, B7/B8, and C6/C7 platforms with longitudinal mounting. This engine received platform-specific adaptations—reinforced engine mounts in the Q5 and revised cooling layouts in the A6—and from 2012 the facelifted A4 B8.5 adopted updated EGR and DPF calibration, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The CDUD's primary reliability risk is EGR cooler failure on pre-2011 units, with elevated incidence in urban and stop-start driving. Internal Audi field reports from 2012 indicated a significant number of early failures before 150,000 km, while UK DVSA MOT data shows coolant-related engine faults as a leading cause of failure in TDI models. Short journeys and infrequent regeneration cycles increase soot accumulation, making proactive maintenance and use of correct oil critical.
Analysis derived from Audi technical bulletins (2008–2013) and UK DVSA failure statistics (2013–2022). 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 CDUD is generally robust when maintained properly, but pre-2011 models are prone to EGR cooler failure. Later revisions with updated coolers show improved durability. Regular DPF regeneration, use of correct oil (VW 504 00/507 00), and adherence to timing belt intervals (180,000 km) are essential for long-term reliability.
Key issues include EGR cooler cracking, DPF clogging due to short trips, timing belt degradation, and turbo actuator sticking. These are documented in Audi service bulletins and field reports. Coolant contamination and regeneration faults are common in urban-driven examples.
The CDUD 2.0 TDI 140 PS was used in the A3 (8P), A4 (B7/B8), A6 (C6), and Q5 (8R) from 2008 to 2013. It was phased out in favour of EA288 engines post-2013. All models meet Euro 5 emissions standards.
Yes, the CDUD responds well to ECU remapping. Stage 1 tunes typically achieve 160–170 PS safely. The engine's internals are strong, but increased power raises exhaust gas temperatures, so upgraded cooling and DPF monitoring are recommended for sustained performance.
In real-world driving, expect 5.0–5.8 L/100km (49–58 mpg UK) in mixed conditions. Highway driving can achieve ~4.5 L/100km (62 mpg UK). Fuel economy depends on driving style, DPF regeneration frequency, and transmission type.
Yes, the CDUD is an interference engine. If the timing belt fails, pistons can strike open valves, causing severe internal damage. This makes strict adherence to the 180,000 km replacement interval absolutely critical.
Audi specifies VW 504 00 / 507 00 (SAE 5W-30) oil. This low-ash formulation protects the DPF and EGR system. Oil must be changed every 15,000–20,000 km or annually to maintain engine and emissions system longevity.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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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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