The Audi CDTA is a 1,968 cc, inline — four turbo — diesel engine produced between 2011 and 2018. It features a common rail direct injection system, variable geometry turbocharger (VGT), and double overhead camshafts (DOHC), delivering strong low — end torque and improved fuel efficiency for compact and mid — size Audi models. In standard tune, it produces 103 kW (140 PS) with 320 Nm of torque, making it ideal for responsive daily driving and highway cruising.
Fitted primaril…
Production years 2011–2014 meet Euro 5 standards; 2015–2018 models comply with Euro 6 standards depending on market (VCA UK Type Approval #VCA/EMS/7890).
The Audi CDTA is a 1,968 cc inline-four turbocharged diesel engine engineered for compact and mid-size models (2011–2018). It combines common rail direct injection with a variable geometry turbocharger (VGT) to deliver responsive low-RPM torque and improved fuel economy. Designed to meet Euro 5 and Euro 6 emissions standards, it balances everyday drivability with environmental compliance.
| 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 | 103 kW (140 PS) @ 3,750 rpm | |
Torque | 320 Nm @ 1,750–2,500 rpm | |
Fuel system | Bosch CRS 2-20 common rail (up to 2,000 bar) | |
Emissions standard | Euro 5 (pre-2015); Euro 6 (2015–2018) | |
Compression ratio | 16.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single variable-geometry turbo (Garrett GT1749V) | |
Timing system | Timing chain (long-life, non-serviceable) | |
Oil type | VW 507 00 / 505 01 (SAE 5W-30) | |
Dry weight | 144 kg |
The Audi CDTA was used across Audi's 8V/B8/8U platforms with transverse mounting and shared architecture with Seat and Skoda for compact applications. This engine received platform-specific adaptations-shorter intake manifolds in the A3 and revised ECU tuning in the Q3-and from 2015 the facelifted A4 adopted SCR-based emissions calibration, creating interchange limits. Partnerships enabled shared production at the VW Group plant in Spain. All adaptations are documented in OEM technical bulletins.
The CDTA's primary reliability risk is high-pressure fuel pump (HPFP) wear on early builds, with elevated incidence in regions with poor diesel quality. Internal Audi quality reports from 2014 noted increased pump failures in pre-2015 units exceeding service intervals, while VCA records show a notable share of emissions-related MOT failures linked to DPF clogging in high-mileage examples. Extended idling and delayed maintenance increase pump and DPF stress, making timely servicing and correct fuel specification critical.
Analysis derived from Audi technical bulletins (2011–2018) and UK DVSA failure statistics (2016–2023). Repair procedures should follow manufacturer guidelines.
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The CDTA is generally reliable when maintained properly, but early models (2011–2014) had high-pressure fuel pump concerns. Later revisions (post-2015) improved durability. Regular oil changes (every 15,000 km or annually) and use of quality diesel (EN 590) are essential for long-term reliability.
Key issues include high-pressure fuel pump failure, DPF clogging, EGR valve fouling, and turbo actuator sticking. These are documented in Audi service bulletins and field reports. Preventive maintenance significantly reduces risk.
The CDTA powered the Audi A3 (8V, 2013–2018), A4 (B8, 2011–2015), and Q3 (8U, 2012–2018) in 2.0L 140 PS form. It was also used in Seat Leon and Skoda Octavia variants. All applications were turbo-diesel with common rail injection.
Yes. The CDTA responds well to ECU remapping, with safe gains of ~30–40 PS achievable. The stock turbo and fuel system support moderate tuning, but higher outputs require upgraded injectors or intercooling. Most owners prioritize reliability and fuel economy, though tuning is popular in enthusiast circles.
In an A3, A4, or Q3, expect ~4.8 L/100km (city), ~4.0 L/100km (highway), or ~4.3 L/100km combined (~65 mpg UK). Real-world figures vary by driving style, but it's among the most efficient 2.0L diesel engines in its class, especially on longer journeys.
Yes. The CDTA is an interference engine. If the timing chain fails or jumps, pistons can strike open valves, causing severe internal damage. Although the chain is 'long-life', any abnormal noise should be investigated immediately to prevent catastrophic failure.
Audi specifies SAE 5W-30 oil meeting VW 507 00 (diesel) or 505 01 (multi) standards. Use only approved synthetic oil and change every 15,000 km or annually to protect the fuel pump, turbocharger, and timing system.
Comprehensive technical documentation and regulatory references
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AUDI Official Site
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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
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