The Audi CXSB is a 1,984 cc, inline — four turbocharged petrol engine produced between 2020 and 2025. Part of the Volkswagen Group's EA888 evo4 engine family, it features direct fuel injection (TSI), variable valve timing (VVT), and a twin — scroll turbocharger. It delivers 140 kW (190 PS) and 320 Nm of torque, with an additional 50 Nm available via overboost, making it ideal for sporty yet efficient performance in compact and mid — size models.
Fitted to models such as the A3 (8…
Production years 2020–2021 meet Euro 6d-TEMP standards; 2022–2025 models comply with full Euro 6d depending on market .
The Audi CXSB is a 1,984 cc inline-four turbocharged petrol engine engineered for compact and mid-size models (2020–2025). It combines EA888 evo4 architecture with a 48V mild-hybrid system and twin-scroll turbocharging to deliver strong low-RPM torque and real-world emissions compliance. Designed to meet Euro 6d standards, it balances performance with efficiency.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,984 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged (twin-scroll) | |
Bore × stroke | 82.5 mm × 92.8 mm | |
Power output | 140 kW (190 PS) @ 4,200–6,000 rpm | |
Torque | 320 Nm @ 1,500–4,000 rpm (370 Nm overboost) | |
Fuel system | Bosch HDEV6 direct injection (up to 350 bar) | |
Emissions standard | Euro 6d-TEMP (2020–2021); Euro 6d (2022–2025) | |
Compression ratio | 11.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Twin-scroll turbo (BorgWarner KP39) | |
Timing system | Chain-driven (longitudinal rear-mounted) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 142 kg |
The Audi CXSB was used across Audi's 8Y/B9/F3 platforms with transverse/longitudinal mounting. This engine received platform-specific calibrations-revised intake runners in the A3 and enhanced cooling layouts in the A4-and from 2022 the facelifted Q3 models adopted EA888 evo4 updates with revised HPFP cooling, creating interchange limits. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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The CXSB delivers strong performance and good efficiency, but early models (2020-2021) had reliability concerns, particularly HPFP wear under high load. Later revisions (post-2022) improved fuel pump and cooling system durability, so well-maintained examples can be robust. Regular servicing with VW 504 00 oil and avoiding prolonged high-load operation without cooldown greatly enhance longevity.
Key issues include HPFP degradation (especially under sustained load), GPF clogging from short trips, turbo actuator sticking, and valve cover oil leaks. These are documented in Audi service bulletins and supported by UK MOT failure data. Proper maintenance and driving habits significantly reduce these risks.
The CXSB 2.0 TFSI was used in the Audi A3 (8Y, 2020–2025), A4 (B9, 2020–2025), and Q3 (F3, 2021–2025). It was phased out in favour of newer EA888 iterations post-2025. All applications were transverse or longitudinal front/all-wheel-drive configurations.
Aftermarket ECU tuning is common on the CXSB 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, the CXSB achieves approximately 6.8–7.5 L/100km (41–38 mpg UK). Highway efficiency is better (~5.8 L/100km), while city driving may reach 9.0 L/100km. Real-world economy depends on driving style and MHEV system health.
Yes. The CXSB is an interference engine. If the timing chain fails or jumps, pistons can collide with open valves, causing catastrophic internal damage. Immediate attention to any timing-related rattles is essential to avoid major engine repairs.
Audi specifies SAE 5W-30 oil meeting VW 504 00 (petrol) or 505 00 (multi) standards. Use only high-quality synthetic oils designed for turbocharged petrol engines and change every 15,000 km or annually to protect the fuel pump and turbocharger.
Comprehensive technical documentation and regulatory references
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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.
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