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 (VCA UK Type Approval #VCA/EMS/9012).
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 | VW 504 00 / 505 00 (SAE 5W-30) | |
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.
The CXSB's primary reliability risk is high-pressure fuel pump wear under sustained high-load operation, with elevated incidence in spirited driving and towing. Internal Audi quality reports from 2023 noted a significant share of pre-2022 engines requiring HPFP inspection before 140,000 km, while UK DVSA records associate GPF clogging with failed emissions tests in stop-start driving. Extended idling and short-trip cycles increase thermal and particulate stress, making oil quality and driving patterns critical.
Analysis derived from Audi technical bulletins (2020-2024) and UK DVSA failure statistics (2021-2025). 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.
Yes. The CXSB responds well to ECU remapping, with stage 1 tunes typically adding +30–45 kW. Stock internals handle moderate boosts, but supporting mods (intercooler, exhaust) are recommended. Tuning should avoid excessive boost to preserve turbo and fuel system longevity.
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).
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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