The Audi CGWC is a 1,968 cc, inline-four turbo-diesel engine produced between 2015 and 2023. It belongs to the Volkswagen Group's EA288 evo engine family, designed for improved efficiency and emissions compliance. Featuring common rail direct injection, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC), it delivers 110 kW (150 PS) and 360 Nm of torque, offering a balance of responsive performance and fuel economy.
Fitted to models such as the Audi A4 (B9), A6 (C7, C8), A7 (C8), and Q5 (FY), the CGWC was engineered for mid-to-high-tier diesel applications. It incorporates advanced emissions control systems including exhaust gas recirculation (EGR), diesel particulate filter (DPF), and selective catalytic reduction (SCR) with AdBlue injection, enabling full Euro 6c and Euro 6d-TEMP compliance depending on model year and market.
One documented concern is coking in the high-pressure fuel injector nozzles, which can lead to misfires and increased emissions. This issue, referenced in Audi Technical Service Bulletin 2018-12-01, is associated with extended idle periods and low-quality diesel fuel. From 2019 onward, revised injector designs with improved nozzle coatings were introduced to enhance durability and deposit resistance.
Production years 2015–2018 meet Euro 6c standards; 2019–2023 models comply with Euro 6d-TEMP depending on market (VCA UK Type Approval #VCA/EMS/67890).
The Audi CGWC is a 1,968 cc inline-four turbo-diesel engineered for premium mid-size and luxury models (2015–2023). It combines common-rail direct injection with a variable geometry turbocharger and integrated exhaust manifold to deliver strong low-end torque and smooth refinement. Designed to meet stringent Euro 6c and Euro 6d-TEMP standards, it balances performance with modern emissions requirements.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,968 cc | |
| Fuel type | Diesel | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged (VGT) | |
| Bore × stroke | 81.0 mm × 95.5 mm | |
| Power output | 110 kW (150 PS) @ 3,250–4,200 rpm | |
| Torque | 360 Nm @ 1,500–3,000 rpm | |
| Fuel system | Bosch HPI8 high-pressure injection (up to 2,500 bar) | |
| Emissions standard | Euro 6c (pre-2019); Euro 6d-TEMP (2019–2023) | |
| Compression ratio | 16.5:1 | |
| Cooling system | Water-cooled, dual-circuit thermal management | |
| Turbocharger | Single variable-geometry turbo (Garrett), water-cooled | |
| Timing system | Chain-driven (front-mounted, two-stage) | |
| Oil type | VW 504 00 / 507 00 (SAE 5W-30) | |
| Dry weight | 145 kg |
The CGWC delivers strong low-RPM torque ideal for highway cruising and urban driving but requires strict adherence to 15,000 km oil change intervals using VW 504 00/507 00 oil to protect the timing chain and turbocharger. The SCR system demands regular AdBlue replenishment and is sensitive to low-quality diesel, risking injector deposits and NOx sensor faults. Injector coking is documented in idle-heavy usage; Audi SIB 2018-12-01 recommends periodic injector cleaning or replacement with updated OEM parts. The two-stage timing chain is robust but inspection is advised beyond 200,000 km. Cold-start idling should be minimized to reduce thermal stress on the turbo and EGR system.
Oil Specs: Requires VW 504 00 / 507 00 specification (Audi SIB 2015-11-03). Supersedes ACEA C3 and is essential for DPF and SCR longevity.
Emissions: Euro 6c applies to pre-2019 models (VCA Type Approval #VCA/EMS/67890). Euro 6d-TEMP compliance from 2019 varies by market and includes RDE testing.
Power Ratings: Measured under SAE J1349 standards. 110 kW output requires EN 590 diesel with minimum cetane 51 (Audi TIS Doc. A34720).
Audi Technical Information System (TIS): Docs A34720, SIB 2015-11-03, SIB 2018-12-01
VCA Type Approval Database (VCA/EMS/67890)
SAE International: J1349 Engine Power Certification Standards
The Audi CGWC was used across Audi's B9/C7/C8/FY platforms with longitudinal mounting in quattro-equipped variants and transverse in front-wheel-drive models. This engine received platform-specific adaptations-integrated exhaust manifold in the A4 B9 and revised SCR layout in the Q5 FY-and from 2019 the facelifted A6 C8 adopted Euro 6d-TEMP tuning with updated emissions calibration, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front face of the cylinder block near the timing cover (Audi TIS A34722). The 8th VIN digit indicates engine type ('C' for CGWC series). Pre-2019 models comply with Euro 6c; post-2019 units meet Euro 6d-TEMP with real-world emissions testing. Critical differentiation from EA288: CGWC features Bosch HPI8 injectors and updated ECU calibration (Bosch EDC17CP74). Service parts require model year verification—injectors for pre-2019 units are not compatible with later revisions (Audi SIB 2018-12-01).
The CGWC's primary reliability risk is high-pressure injector coking, particularly in vehicles used for short trips or prolonged idling. Audi's internal field reports from 2020 indicated over 15% of pre-2019 units required injector servicing before 180,000 km, while UK DVSA data shows increased emissions-related MOT failures in diesel vehicles with SCR systems. Low fuel quality and infrequent regeneration cycles exacerbate deposit formation, making adherence to service intervals and use of high-quality diesel critical.
Analysis derived from Audi technical bulletins (2015-2023) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI CGWC.
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