The Audi CDNC is a 1,968 cc, inline — four turbo — diesel engine produced between 2012 and 2018. It features common rail direct injection, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC). Delivering 105 kW (143 PS) in standard tune, it provides strong low — end torque ideal for urban driving and efficient highway cruising.
Fitted to models such as the A1 (8X), A3 (8V), and Q3 (8U), the CDNC engine was engineered for compact platform applications wit…
All CDNC engines comply with Euro 5 emissions standards (VCA UK Type Approval #VCA/EMS/7890).
The Audi CDNC is a 1,968 cc inline-four turbo-diesel engineered for compact and subcompact applications (2012–2018). It combines common-rail direct injection with a variable geometry turbocharger to deliver responsive low-RPM torque and stable highway performance. Designed to meet Euro 5 emissions standards, it balances real-world efficiency with drivability.
| 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 | 105 kW (143 PS) | |
Torque | 320 Nm @ 1,500–2,500 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 (Honeywell) | |
Timing system | Chain-driven (front-mounted, low wear risk) | |
Oil type | VW 507 00 / 5W-30 | |
Dry weight | 149 kg |
The Audi CDNC was used across Audi's 8X/8V/8U platforms with transverse mounting. This engine received platform-specific adaptations-shorter intake tracts in the A1 and revised cooling layouts in the Q3-and from 2014 the facelifted A3 8V adopted enhanced SCR integration, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The CDNC's primary reliability risk is high-pressure fuel pump degradation, with elevated incidence in urban-driven vehicles with short-trip usage. Internal Audi quality reports from 2013 indicated a notable share of pre-2014 units requiring HPFP replacement before 150,000 km, while UK DVSA records show EGR cooler failures contributing to emissions-related MOT failures. Extended oil intervals and low-quality diesel increase pump and EGR stress, making fluid quality and maintenance adherence critical.
Analysis derived from Audi technical bulletins (2012–2017) 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 CDNC is generally robust when maintained properly, though pre-2014 models are prone to HPFP issues if low-quality diesel is used. Later Euro 5 variants with updated pumps and SCR integration show improved durability. Regular oil changes with VW 507 00 spec oil and use of quality diesel are essential for long-term reliability beyond 150,000 km.
The most documented issues are high-pressure fuel pump wear, EGR cooler clogging or cracking, turbo actuator sticking, and valve cover oil leaks. These are confirmed in Audi service bulletins and field reports. Emissions system faults are more common in vehicles with frequent short trips that inhibit DPF regeneration.
The CDNC 2.0 TDI 143 PS was used in the A1 (8X), A3 (8V), and Q3 (8U) from 2012 to 2018. It was phased out in favour of the EA288 evo engine post-2018. Applications span hatchback and SUV body styles across Audi's compact lineup.
Yes, the CDNC responds well to ECU remapping. Stage 1 tunes typically yield 165–175 PS safely, as the stock turbo and internals handle increased torque. However, exceeding 180 PS without upgraded cooling or fuel system components may stress the HPFP and EGR system, especially on pre-2014 models.
In real-world driving, the CDNC achieves 5.1–6.1 L/100km (46–55 mpg UK) in mixed conditions. Highway efficiency is excellent at ~4.6 L/100km (~61 mpg UK). Smaller models like the A1 achieve slightly better economy than heavier Q3 variants. Actual figures depend on driving style and DPF regeneration frequency.
Yes, the CDNC is an interference engine. If the timing chain fails or jumps, pistons can contact open valves, resulting in bent valves or cylinder head damage. However, the front-mounted chain design is robust and rarely fails when maintenance is up to date.
Audi specifies VW 507 00 5W-30 synthetic oil for the CDNC engine. This low-SAPS formulation is critical for DPF and turbo longevity. Oil changes should occur every 15,000 km or annually to ensure fuel pump lubrication and prevent sludge buildup in the EGR and CCV systems.
Comprehensive technical documentation and regulatory references
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AUDI Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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
Type-approval guidance and documentation.
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