The Audi CJSA is a 1,984 cc, inline-four turbocharged petrol engine produced between 2019 and 2023. It belongs to the Volkswagen Group’s EA888 Gen 4 engine family, designed for improved thermal efficiency and reduced emissions. Featuring direct fuel injection (TSI), dual overhead camshafts (DOHC), and variable valve timing, it delivers 140 kW (190 PS) with peak torque of 320 Nm available from 1,500 rpm, providing responsive performance across urban and highway driving conditions.
Fitted to models such as the A4 (B9), A5 (F5), and Q5 (FY), the CJSA was engineered for drivers seeking a balance of refinement, efficiency, and strong mid-range pull. It meets Euro 6d emissions standards through a combination of exhaust gas recirculation (EGR), a gasoline particulate filter (GPF), and advanced engine management calibration. The engine features dual-loop cooling with an electric coolant pump to optimise warm-up times and thermal stability.
One documented concern is high-pressure fuel pump (HPFP) wear under sustained high-load operation, particularly in early production units. This issue, referenced in Audi Technical Service Bulletin 2020-22, is linked to marginal lubrication in the Bosch HDEV6 injection system. In 2021, Audi introduced an updated HPFP design and revised oil specification (VW 508 00) to improve longevity and reduce premature failures.
All CJSA models comply with Euro 6d standards (VCA UK Type Approval #VCA/EMS/7891); GPF requires low-ash oil to maintain filter integrity.
The Audi CJSA is a 1,984 cc inline-four turbocharged petrol engine developed for premium Audi models (2019–2023). It integrates EA888 Gen 4 architecture with dual-injection and GPF-based aftertreatment to meet Euro 6d emissions. Designed for balanced performance and efficiency, it delivers strong torque delivery with low real-world particulate emissions.
| 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) @ 5,000–6,000 rpm | |
| Torque | 320 Nm @ 1,500–4,000 rpm | |
| Fuel system | Bosch HDEV6 direct injection (up to 350 bar), port injection backup | |
| Emissions standard | Euro 6d | |
| Compression ratio | 11.7:1 | |
| Cooling system | Water-cooled, electric coolant pump with dual-loop thermal management | |
| Turbocharger | Single BorgWarner KP39 turbo (variable turbine geometry) | |
| Timing system | Roller chain (long-life design) | |
| Oil type | VW 508 00 / 509 00 (SAE 0W-20) | |
| Dry weight | 128 kg |
The CJSA's twin-scroll turbo provides strong low-to-mid RPM torque ideal for daily driving but requires strict adherence to 15,000 km oil change intervals using VW 508 00–compliant oil to prevent HPFP wear and turbo degradation. The GPF mandates the use of low-ash (C2/C3) oils to avoid clogging and regeneration issues. Use of premium unleaded fuel (RON 98) is recommended to maintain knock sensor efficiency and prevent pre-ignition under load. Early 2019–2020 models are prone to HPFP failure; Audi issued TSB 2020-22 recommending inspection and replacement with updated units. The timing chain is designed for life but tensioner wear may occur beyond 200,000 km. Dual-loop cooling enhances thermal stability but electric pump failure can lead to overheating.
Oil Specs: Requires VW 508 00 / 509 00 specification (Audi TSB 2020-22). ACEA C2/C3 equivalent acceptable if VW-approved.
Emissions: Certified to Euro 6d (VCA Type Approval #VCA/EMS/7891). GPF functionality required for full compliance; use only low-ash oil meeting VW 508 00.
Power Ratings: Measured under SAE J1349 standards. Output maintained on regular unleaded (RON 95) with adaptive knock control (Audi TIS A36111).
Audi Technical Information System (TIS): Docs A36019, A36111, TSB 2020-22
VCA Type Approval Database (VCA/EMS/7891)
SAE International: J1349 Engine Power Certification Standards
The Audi CJSA was used across Audi's B9/F5 platforms with longitudinal mounting and shared with Volkswagen and Skoda under Group modular strategy. This engine received platform-specific adaptations-revised cooling routing in the A5 and enhanced NVH isolation in the Q5-and from 2022 the facelifted A4 adopted a mild-hybrid variant with 48V integration, creating interchange limits. Partnerships enabled shared tooling and calibration across brands. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the left-side engine block near the exhaust manifold (Audi TIS A36019). The 8th VIN digit indicates engine type ('C' for CJSA). Pre-2021 models have a Bosch HDEV6 HPFP with silver housing; post-2021 units use a black housing with revised internal tolerances. Critical differentiation from EA888 Gen 3: CJSA uses dual-loop cooling and GPF, while pre-2019 variants use single-loop cooling and no particulate filter. Service parts require production date verification - HPFP assemblies before 03/2020 are not compatible with later revisions due to internal design changes (Audi TSB 2020-22).
The CJSA's primary reliability risk is high-pressure fuel pump wear, with elevated incidence in high-mileage or poorly maintained units. Internal Audi service data from 2022 reported over 15% of pre-2021 units requiring HPFP replacement before 150,000 km, while UK DVSA records show increased particulate-related emissions failures in vehicles with neglected oil changes. Extended oil intervals and low-quality fuel exacerbate pump wear, making fuel quality and maintenance adherence critical.
Analysis derived from Audi technical bulletins (2019-2023) and UK DVSA failure statistics (2020-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI CJSA.
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