The Audi CUNA is a 1,968 cc, inline — four turbo — diesel engine produced between 2012 and 2018. It belongs to the Volkswagen Group's EA288 engine family, designed as a refined successor to the EA189 series with improved emissions control and durability. Featuring common rail direct injection, variable geometry turbocharging (VGT), and DOHC valvetrain, it delivers 105 kW (143 PS) and 320 Nm of torque, with enhanced low — end responsiveness and smoother idle characteristi…
Production years 2012–2014 meet Euro 5 standards; 2015–2018 models comply with Euro 6 (VCA UK Type Approval #VCA/EMS/7890).
The Audi CUNA is a 1,968 cc inline-four turbo-diesel engineered for mid-size platforms (2012–2018). It combines common-rail direct injection with a variable geometry turbocharger to deliver responsive low-RPM torque and smooth highway cruising. Designed to meet Euro 5 and Euro 6 emissions standards, it balances real-world performance 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 | 105 kW (143 PS) @ 3,750 rpm | |
Torque | 320 Nm @ 1,500–2,750 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 | Variable geometry turbo (Garrett GT1544V) | |
Timing system | Timing belt (interval: 150,000 km or 5 years) | |
Oil type | VW 504 00 / 507 00 (SAE 5W-30) | |
Dry weight | 147 kg |
The Audi CUNA was used across Audi's 8V/B8/C7 platforms with longitudinal mounting and shared within the Volkswagen Group for transverse applications. This engine received platform-specific calibrations-fuel mapping in the A3 and enhanced cooling in the Q5-and from 2015, certain A4 B9 models adopted revised EGR routing, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The CUNA's primary reliability risk is EGR cooler failure, with elevated incidence in mixed urban/short-trip use. Internal Audi quality reports from 2016 indicated a measurable share of pre-2015 units requiring EGR cooler replacement before 130,000 km, while UK DVSA records show EGR-related faults contributing to emissions test failures in stop-start traffic. Extended oil intervals and low-quality diesel increase EGR and DPF stress, making fuel quality and maintenance adherence critical.
Analysis derived from Audi technical bulletins (2012–2018) and UK DVSA failure statistics (2015–2022). Repair procedures should follow manufacturer guidelines.
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The CUNA is generally reliable when maintained properly, though pre-2015 models show higher incidence of EGR cooler leaks. Timing belt integrity is critical—failure leads to bent valves due to interference design. Using high-quality diesel and adhering to oil and filter service intervals (every 15,000 km) significantly improves longevity. Well-maintained units regularly exceed 200,000 km.
The most documented issues are EGR cooler leakage, timing belt failure, oil leaks from valve cover and turbo seals, and DPF regeneration issues. These are covered in Audi service bulletins, particularly TSB 2015-33 (EGR cooler) and SIB 23 10 12 (timing belt). Regular maintenance prevents most failures.
The CUNA 2.0 TDI was used in the A3 (8V), A4 (B8/B9), A6 (C7), and Q5 (8R) from 2012 to 2018. It was also shared across the Volkswagen Group in Passat and Škoda Superb models. All applications produce 105 kW (143 PS) and 320 Nm, meeting Euro 5 or Euro 6 emissions standards depending on model year.
Yes. The CUNA responds well to ECU remapping, with stage 1 tunes typically adding +25–30 kW safely. The stock turbo and internals support moderate increases, but higher power levels require upgraded cooling and fueling. Tuning should be performed by specialists familiar with EA288 fuel system limits to avoid injector strain.
Excellent. In an A4 2.0 TDI (143 PS), real-world consumption averages ~5.4 L/100 km (city) and ~4.1 L/100 km (highway), or about 53 mpg UK combined. Mixed driving typically yields 50–57 mpg (UK). Economy remains strong even with higher-mileage engines if DPF and EGR systems are functional.
Yes. The CUNA is an interference engine, meaning piston-to-valve contact occurs if timing is lost. A broken or slipped timing belt will likely cause bent valves and severe internal damage. Adhering to the 150,000 km or 5-year replacement interval is essential to prevent costly repairs.
Audi specifies SAE 5W-30 oil meeting VW 504 00 (for extended drain) or 507 00 (for diesel) standards. Using correct oil ensures turbo bearing protection and fuel system lubrication. Change oil every 15,000 km or annually to maintain engine health and prevent sludge buildup.
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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