The Audi CYNB is a 1,968 cc, inline — four turbocharged diesel engine produced between 2019 and 2023. It belongs to the EA288 Evo engine family, featuring common — rail direct injection (up to 2,500 bar), variable geometry turbocharger (VGT), and dual — loop exhaust gas recirculation (EGR). In standard tune it delivers 120 kW (163 PS), with peak torque of 380 Nm available from 1,750 rpm, providing strong low — end pulling power ideal for daily driving.
Fitted to models such as t…
Production years 2019–2023 meet Euro 6d-TEMP standards .
The Audi CYNB is a 1,968 cc inline-four turbocharged diesel engine engineered for compact and mid-size platforms (2019–2023). It integrates Bosch CRS 4-25 common-rail injection with variable geometry turbocharging to deliver responsive torque and low emissions. Designed to meet Euro 6d-TEMP standards, it balances efficiency with stringent emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,968 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 81.0 mm × 95.5 mm | |
Power output | 120 kW (163 PS) @ 3,250–4,200 rpm | |
Torque | 380 Nm @ 1,750–3,000 rpm | |
Fuel system | Bosch CRS 4-25 common-rail (up to 2,500 bar) | |
Emissions standard | Euro 6d-TEMP | |
Compression ratio | 16.5:1 | |
Cooling system | Water-cooled with map-controlled thermostat | |
Turbocharger | Single variable-geometry turbo (BorgWarner) | |
Timing system | Timing chain (front-mounted, maintenance-free design) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 142 kg |
The Audi CYNB was used across Audi's MQB Evo and MLB Evo platforms with transverse (MQB) and longitudinal (MLB) mounting. This engine received platform-specific adaptations-shorter intake runners in the A3 and revised cooling routing in the A6-and from 2021 the facelifted 8L A4 adopted the EA288 Evo+ update with enhanced DPF regeneration logic, creating software compatibility limits. All adaptations are documented in OEM technical bulletins.
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The CYNB's primary reliability risk is high-pressure fuel pump (HPFP) actuator wear under low-fuel conditions, with elevated incidence in urban driving with frequent short trips. Internal Audi quality reports from 2021 noted a significant share of pre-2021 units requiring HPFP replacement before 100,000 km, while VCA MOT data links DPF clogging to stop-start driving in city environments. Extended idling and low-tank operation increase pump and filter stress, making fuel management and service interval adherence critical.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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The CYNB is generally robust when maintained properly, but pre-2021 models have a known HPFP actuator wear issue under low-fuel conditions. Later revisions (post-2021) improved pump durability and DPF management. Regular servicing, use of EN 590 diesel, and maintaining fuel levels above 10% significantly enhance longevity. Well-maintained units can exceed 150,000 km without major repairs.
Key issues include high-pressure fuel pump actuator wear (especially below 10% fuel), diesel particulate filter clogging in city driving, cold-start timing chain rattle, and AdBlue system faults. These are documented in Audi service bulletins and addressed through component updates and software revisions from 2021 onward.
The CYNB is found in the A3 (8Y), A4 (8L), A5 (8T), and A6 (4J) models from 2019 to 2023. It was used in both transverse (MQB Evo) and longitudinal (MLB Evo) applications. Variants include 35 TDI and 40 TDI, all meeting Euro 6d-TEMP standards with SCR and AdBlue integration.
Aftermarket ECU tuning is common on the CYNB platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
In combined driving, expect 5.3–6.0 L/100km (53–47 mpg UK). Highway efficiency improves to ~4.8 L/100km (59 mpg), while city driving may reach 6.8 L/100km (42 mpg). Real-world figures depend on driving style, but DPF regeneration cycles can temporarily increase consumption. Models with S-tronic transmission achieve slightly better economy.
Yes. The CYNB is an interference engine. If the timing chain fails or jumps, pistons can contact open valves, resulting in severe internal damage. While the chain is maintenance-free, tensioner wear can cause slack. Cold-start rattles should be investigated promptly to avoid costly repairs.
Audi specifies 5W-40 synthetic oil meeting Audi Longlife 05 (or newer) standards. This oil ensures proper turbo, VGT, and HPFP lubrication. Change intervals are up to 15,000 km or 1 year, but shorter intervals are advised for stop-start driving. Using incorrect oil can accelerate HPFP and chain wear.
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
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
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VCA Certification Portal
Type-approval guidance and documentation.
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