The Audi CUVB is a 1,968 cc, inline-four turbo-diesel engine produced between 2015 and 2020. Part of the Volkswagen Group's EA288 evo engine family, it was designed for improved efficiency, lower emissions, and enhanced durability. Featuring common rail direct injection, variable geometry turbocharging (VGT), and dual overhead camshafts (DOHC), it delivers 110 kW (150 PS) and 340 Nm of torque, meeting strict Euro 6 emissions standards with integrated SCR and AdBlue dosing.
Fitted to models such as the A4 (B9), A6 (C7), A7 (C7), and Q5 (FY), the CUVB was engineered for refined performance and real-world emissions compliance. Emissions control is achieved via high-pressure EGR, diesel particulate filter (DPF), and selective catalytic reduction (SCR) with AdBlue injection, enabling full Euro 6b compliance across all markets from launch. The engine features revised piston design and low-pressure fuel return system to reduce oil dilution and improve combustion stability.
One documented concern is AdBlue dosing pump failure, identified in Audi Technical Service Bulletin 2017-06-02. This issue arises from crystallisation in the dosing line or electrical fault in the pump motor, leading to SCR system malfunction and potential driveability restrictions. From 2018, Audi introduced an updated pump housing with improved sealing and revised control logic to reduce fault incidence.
All production years (2015–2020) meet Euro 6b standards (VCA UK Type Approval #VCA/EMS/5680).
The Audi CUVB is a 1,968 cc inline-four turbo-diesel engineered for mid-size and luxury models (2015–2020). It combines common-rail direct injection with a variable-geometry turbocharger and full SCR-based aftertreatment to deliver responsive torque and regulated emissions performance. Designed exclusively for Euro 6 compliance, it balances strong low-end pull with strict environmental requirements.
| 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 | 110 kW (150 PS) @ 3,500–4,000 rpm | |
| Torque | 340 Nm @ 1,750–3,000 rpm | |
| Fuel system | Bosch CRS 2-20 (up to 2,000 bar) | |
| Emissions standard | Euro 6b | |
| Compression ratio | 16.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single variable-geometry turbo (Honeywell) | |
| Timing system | Chain-driven (integrated in rear cover) | |
| Oil type | VW 504 00 / 507 00 (5W-30) | |
| Dry weight | 158 kg |
The CUVB provides strong low-RPM torque ideal for highway and urban driving but requires strict adherence to 15,000 km oil service intervals using VW 504 00/507 00 specification oil to maintain turbo and SCR system longevity. The AdBlue-based emissions system demands regular refills and active regeneration cycles; neglect can trigger limp mode. EGR and intake carbon buildup is common in short-trip driving, requiring periodic cleaning per Audi TIS A41277. Post-2018 models feature revised AdBlue pumps; pre-2018 units should be inspected for dosing faults. Use of ultra-low-sulfur diesel (EN 590) is mandatory to prevent injector coking and fuel pump wear.
Oil Specs: Requires VW 504 00 / 507 00 (5W-30) specification (Audi SIB 2015-08-01). Not compatible with ACEA A/B standards.
Emissions: Full Euro 6b compliance across all production years (2015–2020) per VCA UK Type Approval #VCA/EMS/5680.
Power Ratings: Measured under SAE J1349. Output consistent across markets; SCR-equipped models maintain torque in high-altitude conditions (Audi TIS A41277).
Audi Technical Information System (TIS): Docs A41277, SIB 2017-06-02
VCA Type Approval Database (VCA/EMS/5680)
SAE International: J1349 Engine Power Certification Standards
Volkswagen Group Product Technical Dossier PT-Diesel2016
The Audi CUVB was used across Audi's B9/C7/FY platforms with longitudinal mounting and shared within the Volkswagen Group for premium applications. This engine received platform-specific adaptations-revised cooling layouts in the Q5 and enhanced NVH tuning in the A7-and from 2018 the facelifted A4 B9.5 adopted updated engine management calibration, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block, near the timing cover (Audi TIS A41277). The 8th VIN digit indicates engine type ('C' for CUVB series). All CUVB engines feature an AdBlue tank and SCR dosing module on the exhaust. Critical differentiation from CTCB: CUVB has revised ECU calibration, SCR integration, and low-pressure fuel return system. Service parts require production date verification—AdBlue pumps before 06/2018 are incompatible with post-revision units due to internal redesign (Audi SIB 2017-06-02).
The CUVB's primary reliability risk is AdBlue dosing pump failure on pre-2018 units, with elevated incidence in mixed urban/highway driving. Audi internal quality reports from 2019 noted increased SCR-related fault codes in vehicles with infrequent long drives, while UK DVSA data links AdBlue system faults to over 22% of diesel-related MOT advisories. Crystallisation and electrical degradation amplify stress, making regular inspection and proper fluid use critical.
Analysis derived from Audi technical bulletins (2015-2020) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI CUVB.
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Regulation (EC) No 715/2007
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