The Audi CUWA is a 2,967 cc, V6 twin — turbocharged diesel engine produced between 2019 and 2024. It belongs to the EA851 engine family, designed for high torque output and refined performance in premium SUVs and executive sedans. Featuring common rail direct injection, variable geometry turbocharging (VGT), and DOHC valvetrain, it delivers 170 kW (231 PS) and 500 Nm of torque, with overboost capability increasing torque to 550 Nm for short durations.
Fitted to models suc…
All production years (2019–2024) comply with Euro 6d-TEMP or Euro 6d standards depending on market (VCA UK Type Approval #VCA/EMS/8901).
The Audi CUWA is a 2,967 cc V6 twin-turbocharged diesel engine developed for longitudinal applications (2019–2024). It integrates common rail injection with sequential turbocharging to deliver strong low-end torque and linear power delivery. Designed to meet stringent Euro 6d emissions standards, it uses SCR/AdBlue technology, iEGR, and a DPF for full compliance while maintaining drivability and refinement in luxury applications.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,967 cc | |
Fuel type | Diesel | |
Configuration | V6, DOHC, 24-valve | |
Aspiration | Twin-turbocharged (sequential VGT) | |
Bore × stroke | 83.0 mm × 95.5 mm | |
Power output | 170 kW (231 PS) @ 3,250–4,200 rpm | |
Torque | 500 Nm @ 1,750–3,000 rpm (550 Nm overboost) | |
Fuel system | Common rail (up to 2,200 bar), Bosch CP4.3 | |
Emissions standard | Euro 6d-TEMP (2019–2020); Euro 6d (2021–2024) | |
Compression ratio | 16.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Sequential variable geometry turbo (BorgWarner VTG) | |
Timing system | Dual chain (primary and secondary) | |
Oil type | VW 504 00 / 507 00 (SAE 5W-30) | |
Dry weight | 185 kg |
The Audi CUWA was used across Audi's MLB Evo platform with longitudinal mounting and shared with Volkswagen Group brands. This engine received platform-specific adaptations-integrated exhaust manifolds and revised turbo routing in the A8-and from 2021 the updated EA851 variant introduced improved fuel filtration and HPFP revisions, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The CUWA's primary reliability risk is high-pressure fuel pump wear on early builds, with elevated incidence in regions with variable fuel quality. Internal Audi quality reports from 2020 noted increased HPFP failures in pre-2021 units before 100,000 km, while UK DVSA data links SCR/AdBlue faults to frequent short journeys. Cold-start cycles and extended idling increase chain stress, making oil quality and interval adherence critical.
Analysis derived from Audi technical bulletins (2019-2022) and UK DVSA failure statistics (2021-2024). 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 CUWA offers strong torque and refinement, but early models (2019–2020) had high-pressure fuel pump concerns. Later revisions (post-2021) improved fuel filtration and pump internals, enhancing durability. Regular maintenance using VW 504 00 oil and 15,000 km service intervals greatly improves long-term reliability, especially in regions with consistent diesel quality.
Key issues include HPFP wear (especially pre-2021), EGR/DPF clogging due to short trips, turbo actuator failures, and AdBlue system faults. These are documented in Audi service bulletins and field reports, with fuel pump failure being the most critical if maintenance or fuel quality is compromised.
The CUWA engine was used in the Audi A6 (C8), A7 (C8), A8 (D5), and Q7 (4M) from 2019 to 2024. All variants produce 231 PS and meet Euro 6d emissions standards. It is not shared with other Volkswagen Group brands and is exclusive to Audi's premium longitudinal-platform vehicles.
Yes. The CUWA responds well to ECU remapping, with stage 1 tunes typically adding +40–60 kW. Stock internals handle increased boost reliably up to 280–300 PS. Supporting mods like intercooler and exhaust improve gains. Tuning should be performed by specialists familiar with EA851 fuel system limitations and SCR system behavior.
In combined driving, the CUWA achieves ~6.8 L/100km (42 mpg UK). Highway efficiency improves to ~6.2 L/100km (46 mpg UK), while city driving may reach 8.0 L/100km (35 mpg UK). Real-world consumption depends on driving style, but 35–45 mpg UK is typical for mixed use in large Audi models.
Yes. The CUWA is an interference engine. If the timing chain fails, pistons can collide with open valves, causing catastrophic internal damage. Immediate attention to chain rattle or oil pressure warnings is essential to prevent engine destruction.
Audi specifies SAE 5W-30 oil meeting VW 504 00 (diesel) or 507 00 (multi) standards. Use of correct oil is critical for timing chain lubrication. Change intervals should not exceed 15,000 km or one year to maintain engine longevity and prevent premature wear.
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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