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 (8Y), A4 (B9), and Q3 (F3), the CXSB was engineered for responsive driving dynamics and improved emissions compliance. It features a lightweight aluminium construction, integrated exhaust manifold, and a particulate filter (GPF) to meet Euro 6d standards. The engine also incorporates a 48V mild-hybrid system (MHEV) with belt-driven starter-generator (BSG) to reduce fuel consumption and enhance start-stop smoothness.
One documented concern is high-pressure fuel pump (HPFP) wear under sustained high-load operation, highlighted in Audi Technical Service Bulletin 01 20 05. The issue stems from thermal stress and oil degradation affecting the pump's internal lubrication. From 2022 onwards, Audi introduced revised oil change intervals and updated HPFP designs to improve longevity across EA888 evo4 engines.
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 twin-scroll turbo provides strong low-RPM torque ideal for responsive driving but requires adherence to 15,000 km oil change intervals using VW 504 00 (5W-30) oil to maintain HPFP and turbo longevity. The 48V MHEV system improves start-stop efficiency but demands inspection of the belt-driven starter-generator (BSG) and lithium-ion buffer battery during service. Extended high-load operation increases HPFP thermal stress, as noted in Audi TSB 01 20 05. GPF requires periodic regeneration; short trips may lead to clogging. Post-2022 models feature revised HPFP cooling; pre-2022 units should follow updated maintenance guidelines.
Oil Specs: Requires VW 504 00 (5W-30) specification (Audi TSB 01 20 05). ACEA C3 compliant oils acceptable.
Emissions: Euro 6d-TEMP certification applies to pre-2022 models only (VCA Type Approval #VCA/EMS/9012). Full Euro 6d compliance confirmed for 2022–2025 models in UK market.
Power Ratings: Measured under SAE J1349 standards. Overboost (370 Nm) requires stable fuel quality (RON 95+, EN 228) and functional thermal management.
Audi Technical Information System (TIS): Docs E30760, E31023, E31105, TSB 01 20 05
VCA Type Approval Database (VCA/EMS/9012)
SAE International: J1349 Engine Power Certification Standards
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.
Locate the engine code stamped vertically on the right-side engine block near the exhaust manifold (Audi TIS E30940). The 8th VIN digit indicates engine family ('C' for EA888 series). Pre-2022 models have silver valve covers with black plastic timing covers; post-2022 units use black valve covers. Critical differentiation from EA888 evo4: Original CXSB uses Bosch MED 17.8.8 ECU with rectangular diagnostic connector, while post-2022 variants use MED 17.8.10 with updated HPFP mapping. Service parts require production date verification - fuel pumps for engines before 06/2022 are incompatible with later units due to revised cooling and lubrication design (Audi TSB 01 20 05).
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.
Find answers to most commonly asked questions about AUDI CXSB.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with AUDI or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
AUDI Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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.
VCA Certification Portal
Type-approval guidance and documentation.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialAUDI documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed“ .
All external links open in new tabs. Please verify current availability of resources.
