The Audi CWUC is a 1,968 cc, inline — four turbo — diesel engine produced between 2013 and 2020. It belongs to the Volkswagen Group's EA288 engine family, engineered as a refined, emissions — compliant successor to the EA189 series. Featuring common rail direct injection, variable geometry turbocharging (VGT), and DOHC valvetrain, it delivers 105 kW (143 PS) and 320 Nm of torque, with improved low — end responsiveness and enhanced thermal efficiency.
Fitted to models incl…
Production years 2013–2020 meet Euro 6 standards (VCA UK Type Approval #VCA/EMS/8901).
The Audi CWUC is a 1,968 cc inline-four turbo-diesel engineered for mid-size platforms (2013–2020). 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 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 CP3 common-rail (up to 1,600 bar) | |
Emissions standard | Euro 6 | |
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 CWUC 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 2016, certain A4 B9 models adopted revised EGR routing, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The CWUC's primary reliability risk is high-pressure fuel pump wear, with elevated incidence in mixed urban/highway use. Internal Audi quality reports from 2017 indicated a measurable share of pre-2016 units requiring HPFP replacement before 150,000 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 pump and EGR stress, making fuel quality and maintenance adherence critical.
Analysis derived from Audi technical bulletins (2013–2020) and UK DVSA failure statistics (2016–2023). 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 CWUC is generally robust when maintained properly, but pre-2016 models show higher incidence of HPFP wear. 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 250,000 km.
The most documented issues are high-pressure fuel pump wear, EGR valve/cooling clogs, timing belt failure, and oil leaks from valve cover and turbo seals. These are covered in Audi service bulletins, particularly TSB 2016-28 (HPFP) and SIB 23 10 12 (timing belt). Regular maintenance prevents most failures.
The CWUC 2.0 TDI was used in the A3 (8V), A4 (B8/B9), A6 (C7), and Q5 (8R) from 2013 to 2020. 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 6 emissions standards.
Yes. The CWUC responds well to ECU remapping, with stage 1 tunes typically adding +20–30 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 HPFP 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 CWUC 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 pump 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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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
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DVLA: Engine Changes & MoT
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Vehicle Certification Agency (VCA)
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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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