The Audi CDNB is a 1,968 cc, inline — four turbo — diesel engine produced between 2011 and 2018. It features 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, serving as a refined and efficient powertrain for Audi’s compact and mid — size lineup.
Fitted to models such as the A3 (8V), A4 (B8/B9), A6 (C7), and Q5 (8L), the CDNB engine was engineered for smooth o…
Production years 2011–2014 meet Euro 5 standards; 2015–2018 models comply with Euro 6b depending on market (VCA UK Type Approval #VCA/EMS/6789).
The Audi CDNB is a 1,968 cc inline-four turbo-diesel engineered for compact and executive models (2011–2018). It combines common-rail direct injection with a variable geometry turbocharger to deliver responsive low-end torque and highway efficiency. Designed to meet Euro 5 and Euro 6 emissions standards, it balances daily drivability with regulatory 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 CP3 common-rail (up to 1,600 bar) | |
Emissions standard | Euro 5 (2011–2014); Euro 6b (2015–2018) | |
Compression ratio | 16.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single variable-geometry turbo (Garrett GT1544V) | |
Timing system | Chain-driven (front-mounted, non-interference design) | |
Oil type | Audi Longlife-03 (SAE 5W-30) | |
Dry weight | 148 kg |
The Audi CDNB was used across Audi's 8V/B8/B9 platforms with longitudinal mounting. This engine received platform-specific adaptations-shortened intake manifolds in the A3 (8V) and revised cooling routing in the Q5 (8L)-and from 2015 the facelifted A4 B9 models adopted updated SCR calibration, creating minor service part differences. All adaptations are documented in OEM technical bulletins.
The CDNB's primary reliability risk is EGR cooler leakage on early builds, with elevated incidence in vehicles used for frequent short trips. Internal Audi quality reports from 2016 noted a significant share of pre-2015 units requiring EGR cooler replacement before 180,000 km, while UK DVSA MOT data links DPF/SCR faults to urban-driven vehicles. Extended oil intervals and low-quality diesel increase pump and turbo wear, making fuel quality and maintenance adherence critical.
Analysis derived from Audi technical bulletins (2011–2018) 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 CDNB is generally robust when maintained properly, but early models (2011–2014) are prone to EGR cooler leaks. Later revisions (post-2015) with aluminium-core coolers show improved durability. Regular oil changes with Audi Longlife-03 (5W-30) and use of high-quality diesel (EN 590) significantly extend engine life. Well-maintained units can exceed 250,000 km reliably.
The most documented issues are EGR cooler leakage (especially pre-2015), DPF regeneration failure, turbo actuator sticking, and AdBlue system faults. These are covered in Audi service bulletins and field reports. Proper maintenance, fuel quality, and regular highway driving are key to avoiding these failures.
The CDNB 2.0 TDI 140 PS engine was used in the A3 (8V), A4 (B8/B9), A6 (C7), and Q5 (8L) from 2011 to 2018. It was phased out in favor of newer EA288 engines. All applications are longitudinally mounted with minor platform-specific tuning and ancillary layouts.
Yes. The CDNB responds well to ECU remapping, with stage 1 tunes safely achieving 170–180 PS. The stock turbo and internals handle moderate increases, but supporting mods (intercooler, exhaust) are recommended for higher outputs. Tuning should preserve DPF/EGR/SCR functions to avoid reliability issues.
Excellent. In an A4 2.0 TDI (B9), combined consumption is ~5.0 L/100 km (~56 mpg UK). Highway runs can achieve ~4.3 L/100 km (~65 mpg). Real-world mixed driving typically yields 50–55 mpg UK. Economy remains strong even with age if DPF and SCR systems are functioning properly.
No. The CDNB uses a non-interference valvetrain design. If the timing chain fails, piston-to-valve contact is unlikely, reducing risk of catastrophic damage. However, chain replacement is still recommended at 200,000 km or if excessive wear is detected.
Audi specifies 5W-30 synthetic oil meeting Longlife-03 (or newer) standards. Change intervals should not exceed 15,000 km or one year. Using correct oil ensures proper lubrication of the HPFP and turbo, and helps prevent sludge and carbon buildup in the EGR system.
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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