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 (VCA UK Type Approval #VCA/EMS/7890).
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 | VW 507 00 (SAE 0W-30) | |
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.
The CDTC's primary reliability risk is DPF clogging on early builds, with elevated incidence in city-driven vehicles. Internal Audi quality reports from 2018 indicated a significant share of pre-2018 engines requiring DPF cleaning or replacement before 100,000 km, while UK DVSA records link a notable portion of emissions-related MOT failures to DPF tampering or blockage in urban-driven vehicles. Frequent short trips and low exhaust temperatures increase soot accumulation, making driving pattern and maintenance adherence critical.
Analysis derived from Audi technical bulletins (2016-2019) and UK DVSA failure statistics (2017-2023). 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 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 Type Approval #VCA/EMS/7890, requiring AdBlue for SCR operation.
Yes. The CDTC responds well to ECU remapping. Stage 1 tunes typically add +30–40 kW safely, as the stock turbo and internals handle increased boost. Supporting mods like upgraded intercoolers enhance reliability at higher outputs. Tuning should be performed by specialists familiar with EA288 engine management to avoid overboost or EGR faults.
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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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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