The Audi CSWB is a 1,984 cc, inline-four turbocharged petrol engine produced between 2015 and 2021. It forms part of the EA888 Gen 3B engine family, featuring direct fuel injection (FSI), variable valve timing, and integrated exhaust manifold for thermal efficiency. In standard tune it delivers 140 kW (190 PS), with peak torque of 320 Nm available from 1,500 rpm, enabling responsive urban and highway performance.
Fitted to models such as the 8V/8VFL A3, 8S/8Y TT, B9/B9L A4/A5, and C8 A6, the CSWB was engineered for balanced driving dynamics, blending fuel efficiency with sporty responsiveness. Emissions compliance was achieved via a gasoline particulate filter (GPF) and advanced lambda control, allowing Euro 6b compliance across all production years, with OBD monitoring per EU Regulation (EC) No 715/2007.
One documented concern is high-pressure fuel pump (HPFP) wear under low-fuel conditions, highlighted in Audi Service Bulletin 2017-15-01 (Ref. 613151). Premature wear stems from inadequate lubrication when fuel levels drop below 10%. From 2018, Audi revised the HPFP material specification and updated fuel system diagnostics to monitor rail pressure variance, reducing failure incidence in later builds.
Production years 2015–2021 meet Euro 6b standards (VCA UK Type Approval #VCA/E/18472).
The Audi CSWB is a 1,984 cc inline-four turbocharged petrol engine engineered for compact and mid-size platforms (2015–2021). It combines TFSI direct injection with dual variable valve timing to deliver responsive low-end torque and smooth power delivery. Designed to meet Euro 6b standards, it balances performance with emissions compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,984 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 82.5 mm × 92.8 mm | |
| Power output | 140 kW (190 PS) @ 4,200–6,000 rpm | |
| Torque | 320 Nm @ 1,500–4,100 rpm | |
| Fuel system | Bosch HDEV5 direct injection (up to 200 bar) | |
| Emissions standard | Euro 6b | |
| Compression ratio | 9.6:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single-scroll turbo with electronic wastegate (Honeywell) | |
| Timing system | Timing chain (front-mounted, maintenance-free design) | |
| Oil type | Audi Longlife 05 (SAE 5W-40) | |
| Dry weight | 135 kg |
The CSWB delivers strong low-end torque ideal for daily driving but requires consistent use of high-octane fuel (RON 98) to maintain combustion efficiency and prevent knock sensor activation. Audi Longlife 05 (5W-40) oil is essential for turbo bearing and variable valve actuator longevity. Extended low-fuel operation increases HPFP wear risk due to reduced lubrication; keeping fuel above 10% minimises this. The GPF requires regular motorway runs to enable passive regeneration. Post-2018 models feature revised HPFP components; pre-2018 units benefit from updated pump and rail pressure monitoring per Audi SIB 2017-15-01.
Oil Specs: Requires Audi Longlife 05 (5W-40) specification (Audi SIB 2015-10-02). Supersedes ACEA A3/B4 standards.
Emissions: Euro 6b certification applies to all 2015–2021 models (VCA Type Approval #VCA/E/18472).
Power Ratings: Measured under ECE R85 standards. 140 kW output requires RON 98 fuel (Audi TIS Doc. A19012).
Audi Technical Information System (TIS): Docs A18880, A18881, A18883, SIB 2017-15-01
VCA Type Approval Database (VCA/E/18472)
European Commission: Regulation (EC) No 715/2007
The Audi CSWB was used across Audi's MQB and MLB 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 2018 the facelifted B9L A4 adopted the Gen 3B+ update with enhanced GPF regeneration logic, creating software compatibility limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front cylinder block near the timing cover (Audi TIS A18885). The 8th VIN digit indicates engine family ('C' for EA888 series). Pre-2018 models have silver valve covers with integrated coil packs; post-2018 units feature black valve covers with revised injector connectors. Critical differentiation from EA888 Gen 3A: CSWB includes a gasoline particulate filter (GPF) and uses Bosch HDEV5 injectors. Service parts require model year verification—HPFP and GPF assemblies are not interchangeable between pre- and post-2018 models due to control strategy revisions (Audi SIB 2017-15-01).
The CSWB's primary reliability risk is high-pressure fuel pump wear under low-fuel conditions, with elevated incidence in urban driving with frequent short trips. Internal Audi quality reports from 2018 noted a significant share of pre-2018 units requiring HPFP replacement before 100,000 km, while VCA MOT data links GPF 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 Audi technical bulletins (2015-2020) and UK DVSA failure statistics (2018-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI CSWB.
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