The Audi CUSB is a 1,968 cc, inline — four turbo — diesel engine produced between 2015 and 2020. It belongs to the Volkswagen Group's EA288 engine family, designed for improved emissions compliance and thermal efficiency. Featuring common rail direct injection, variable geometry turbocharging (VGT), and DOHC valvetrain, it delivers 110 kW (150 PS) with peak torque of 340 Nm available from 1,750 rpm.
Fitted to models including the Audi A3 (8V), A4 (B9), and Q3 (8U), the CUSB…
All CUSB models comply with Euro 6b emissions standards (VCA UK Type Approval #VCA/EMS/7890).
The Audi CUSB is a 1,968 cc inline-four turbo-diesel engineered for compact and mid-size models (2015–2020). It combines common-rail direct injection with a variable-geometry turbocharger to deliver responsive low-end torque and efficient cruising. Designed to meet Euro 6b emissions standards, it balances 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 | 110 kW (150 PS) @ 3,500–4,000 rpm | |
Torque | 340 Nm @ 1,750–3,000 rpm | |
Fuel system | Bosch CRS 3-20 common-rail (up to 2,000 bar) | |
Emissions standard | Euro 6b | |
Compression ratio | 16.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single variable-geometry turbo (Garrett GT1749V with integrated EGR) | |
Timing system | Chain-driven (timing belt for accessories) | |
Oil type | VW 504 00 / 507 00 (SAE 5W-30) | |
Dry weight | 150 kg |
The Audi CUSB was used across Audi's 8V/B9/8U platforms with longitudinal mounting and shared within the Volkswagen Group. This engine received platform-specific adaptations—modified intake manifolds in the A3 and revised cooling layouts in the Q3—and from 2017 the facelifted A4 B9 models adopted updated ECU calibrations and enhanced DPF regeneration logic, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The CUSB's primary reliability risk is high-pressure fuel pump wear, with elevated incidence in urban driving cycles. Internal Audi field reports from 2017 indicated a significant number of pre-2016 units required HPFP replacement before 150,000 km, while UK DVSA MOT data shows EGR/DPF clogging as a leading cause of emissions failure in city-driven vehicles. Frequent short trips and low-quality diesel increase fuel system stress, making fuel quality and service adherence critical.
Analysis derived from Audi technical bulletins (2015–2020) and UK DVSA failure statistics (2018–2022). 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 CUSB offers solid performance and efficiency, but pre-2016 models are prone to high-pressure fuel pump wear, especially with poor fuel or short-trip driving. Later models (2017+) show improved fuel system durability. Regular maintenance using VW 504 00/507 00 oil and periodic EGR/DPF servicing greatly enhance longevity.
Key issues include high-pressure fuel pump failure, EGR and intake carbon buildup, turbo actuator sticking, and oil leaks from the valve cover. These are documented in Audi service bulletins. Fuel quality and maintenance intervals significantly influence reliability, particularly for the HPFP and emissions systems.
The CUSB was used in the Audi A3 (8V, 2015–2020), A4 (B9: 2015–2019), A6 (C7: 2016–2018), and Q3 (8U: 2015–2018). It was also shared across the Volkswagen Group in models like the VW Tiguan (5N) and Škoda Octavia (NJ). All applications feature 150 PS and 340 Nm output.
Yes. The CUSB responds well to ECU remapping, with safe gains of +30–40 kW (40–55 PS) achievable on stage 1. Stock internals handle increased torque, but supporting mods like upgraded intercooler and exhaust improve reliability. Tuning should be performed by specialists familiar with Bosch EDC17 systems.
Excellent. In an A4 B9 2.0 TDI, combined consumption is ~4.8 L/100km (~59 mpg UK). Highway runs can achieve ~4.1 L/100km (~69 mpg UK), while city driving may see ~6.0 L/100km (~47 mpg UK). Real-world figures depend on driving style, but 50–55 mpg UK is typical for mixed use.
Yes. The CUSB is an interference engine, meaning a timing chain or belt failure can result in piston-to-valve contact and severe internal damage. While the timing chain is generally durable, the accessory belt must be inspected regularly to prevent ancillary failure.
Audi specifies VW 504 00 / 507 00 (SAE 5W-30) synthetic oil. This low-ash formulation is critical for DPF longevity and turbocharger protection. Change intervals should not exceed 15,000 km or one year, whichever comes first, to ensure fuel pump and chain lubrication.
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
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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
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
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