The Audi CDSB is a 1,968 cc, inline — four turbo — diesel engine produced between 2015 and 2020. It features common rail direct injection, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC). In standard tune, it delivers 110 kW (150 PS) and 340 Nm of torque, designed for responsive performance and efficiency in Audi's compact and mid — size lineup.
Fitted to models such as the A3 (8V), A4 (B9), and Q5 (FY), the CDSB engine was engineered for drivers seeki…
Production years 2015–2018 meet Euro 6b standards; 2018–2020 models comply with Euro 6d-TEMP depending on market (VCA UK Type Approval #VCA/EMS/5680).
The Audi CDSB 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 highway cruising. Designed to meet Euro 6b and Euro 6d-TEMP 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 2.0 common-rail (up to 1,800 bar) | |
Emissions standard | Euro 6b (2015–2018); Euro 6d-TEMP (2018–2020) | |
Compression ratio | 16.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single variable-geometry turbo (Garrett GT1749V) | |
Timing system | Chain-driven (double-row, front-mounted) | |
Oil type | Audi Longlife-05 (SAE 5W-30) | |
Dry weight | 169 kg |
The Audi CDSB was used across Audi's 8V/B9/FY platforms with transverse mounting in front-wheel-drive models and longitudinal in quattro variants. This engine received platform-specific adaptations—reinforced engine mounts in the Q5 (FY) and revised intake manifolds in the A3 (8V)—and from 2018 the Euro 6d-TEMP update introduced enhanced SCR and OBD-II diagnostics, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The CDSB's primary reliability risk is high-pressure fuel pump wear, with elevated incidence in urban-driven vehicles with short trips. Internal Audi quality reports from 2017 noted increased HPFP failures in units with oil change intervals exceeding 15,000 km, while UK DVSA data links a significant share of emissions-related MOT failures to EGR/DPF clogging. Frequent cold starts and low-quality diesel exacerbate fuel system stress, making fuel quality and service adherence critical.
Analysis derived from Audi technical bulletins (2015-2020) and UK DVSA failure statistics (2015-2023). 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 CDSB is generally robust when maintained properly, but models with extended oil intervals or poor fuel quality are prone to HPFP and EGR issues. Post-2018 Euro 6d-TEMP variants include enhanced SCR and improved diagnostics, enhancing longevity. Regular 15,000 km services with Audi Longlife-05 oil and use of high-quality diesel significantly improve reliability.
The most common issues are high-pressure fuel pump wear, EGR/DPF clogging, turbo actuator sticking, and timing chain tensioner rattle. These are documented in Audi service bulletins and are often linked to service neglect or short-trip driving. Using proper oil and fuel and allowing regular regeneration cycles mitigates most risks.
The CDSB engine was used in the A3 (8V, 2015–2020), A4 (B9, 2016–2020), A6 (C8, 2018–2020), and Q5 (FY, 2017–2020). It was phased out in favor of EA288 Evo engines post-2020. All variants produce 110 kW (150 PS) and 340 Nm, with Euro 6b and Euro 6d-TEMP emissions compliance depending on model year.
Yes. The CDSB responds well to ECU remapping, with stage 1 tunes typically adding +25–35 kW safely. The stock turbo and internals handle increased torque, but supporting mods like upgraded intercoolers and exhausts improve reliability at higher power levels. Tuning should be performed by specialists familiar with Bosch EDC17 systems.
In combined driving, the CDSB achieves approximately 4.4–5.1 L/100 km (54–64 mpg UK). Highway consumption can be as low as 4.0 L/100 km (70 mpg UK), while city driving may reach 5.9 L/100 km (48 mpg UK). Real-world economy depends on driving style, vehicle weight, and DPF regeneration frequency.
Yes. The CDSB is an interference engine, meaning that if the timing chain fails or jumps, pistons can collide with open valves, causing catastrophic internal damage. Proper maintenance of the chain tensioner and adherence to oil service intervals are essential to prevent such failures.
Audi specifies SAE 5W-30 oil meeting Longlife-05 specification. This low-ash formulation is critical for protecting the turbocharger, EGR system, and DPF. Oil changes should be performed every 15,000 km or annually to ensure optimal engine longevity and emissions system function.
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.
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