The Audi CDTC is a 1,968 cc, inline — four turbocharged diesel engine produced between 2016 and 2020. Part of the Volkswagen Group's EA288 engine family, it features aluminium construction, common rail direct injection, and dual overhead camshafts (DOHC). In standard tune it delivered 110 kW (150 PS) with peak torque of 340 Nm, offering a balance of efficiency and responsive low — end pull for compact and mid — size models.
Fitted primarily to the Audi A3 (8V), A4 (B9), and Q3 (…
All production years (2016–2020) comply with Euro 6c emissions standards .
The Audi CDTC is a 1,968 cc inline-four turbocharged diesel engine engineered for compact and mid-size applications (2016–2020). It combines common rail injection with dual-loop EGR and SCR-based aftertreatment to deliver strong low-end torque and meet strict emissions standards. Designed to comply with Euro 6c, it balances drivability with environmental performance.
| 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 | 110 kW (150 PS) @ 3,250–4,200 rpm | |
Torque | 340 Nm @ 1,750–3,000 rpm | |
Fuel system | Bosch CRS 2-20 common rail (up to 2,000 bar) | |
Emissions standard | Euro 6c | |
Compression ratio | 16.5:1 | |
Cooling system | Water-cooled with electric coolant pump | |
Turbocharger | Variable geometry turbo (IHI VGT) | |
Timing system | Chain (front-mounted; revised guides post-2018) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 142 kg |
The Audi CDTC was used across Audi's 8V/B9 platforms with transverse mounting and shared within the Volkswagen Group for longitudinal applications in select markets. This engine received platform-specific adaptations-revised EGR paths in the A4 and enhanced DPF cooling in the Q3-and from 2018 the facelifted A3 Sportback adopted the CDTC with updated regeneration logic, creating interchange limits. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. 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 CDTC offers strong low-end torque and good fuel economy, but early models (2016-2017) had reliability concerns, particularly DPF clogging in urban use. Later revisions (post-2018) improved regeneration logic and EGR durability. Well-maintained examples with regular highway runs and proper oil (0W-30 VW 507 00) can be robust. Avoid frequent short trips to prevent DPF issues.
The main issues are DPF clogging (especially in city driving), EGR valve carbon buildup, turbo VGT actuator binding, and occasional high-pressure fuel pump wear. These are documented in Audi technical service bulletins. Regular maintenance and proper fuel quality are essential to mitigate these risks.
The CDTC 2.0 TDI was used in the Audi A3 (8V, 2016–2020), A4 (B9, 2016–2020), and Q3 (8U, 2016–2018). It was also shared with the Volkswagen Tiguan (2017–2020). All models are Euro 6c compliant per VCA / Manufacturer Specification, requiring AdBlue for SCR operation.
Aftermarket ECU tuning is common on the CDTC platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Excellent for a diesel engine. In an A4 2.0 TDI (2017), combined consumption is ~4.3 L/100km (~65 mpg UK). Real-world figures vary by driving style, but expect 50–60 mpg UK on mixed roads. Highway efficiency improves to ~70 mpg UK. Urban driving may drop to 40–50 mpg UK due to DPF regeneration demands.
Yes. The EA288 engine family, including the CDTC, is an interference design. If the timing chain fails or skips, pistons can strike open valves, causing catastrophic engine damage. Prompt attention to any timing-related noise is essential to avoid costly repairs.
Audi specifies SAE 0W-30 oil meeting VW 507 00 standards. This low-SAPS formulation is critical for protecting the DPF and SCR systems. Change intervals should not exceed 15,000 km or one year. Using incorrect oil can lead to aftertreatment system damage and costly repairs.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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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